pyr0ball
173f7f37d4
Ports prior voice assistant research and prototypes from devl/Devops into the Minerva repo. Includes: - docs/: architecture, wake word guides, ESP32-S3 spec, hardware buying guide - scripts/: voice_server.py, voice_server_enhanced.py, setup scripts - hardware/maixduino/: edge device scripts with WiFi credentials scrubbed (replaced hardcoded password with secrets.py pattern) - config/.env.example: server config template - .gitignore: excludes .env, secrets.py, model blobs, ELF firmware - CLAUDE.md: Minerva product context and connection to cf-voice roadmap
542 lines
13 KiB
Markdown
Executable file
542 lines
13 KiB
Markdown
Executable file
# Voice Assistant Hardware - Buying Guide for Second Unit
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**Date:** 2025-11-29
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**Context:** You have one Maix Duino (K210), planning multi-room deployment
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**Question:** What should I buy for the second unit?
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---
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## Quick Answer
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**Best Overall:** **Buy another Maix Duino K210** (~$30-40)
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**Runner-up:** **ESP32-S3 with audio board** (~$20-30)
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**Budget:** **Generic ESP32 + I2S** (~$15-20)
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**Future-proof:** **Sipeed Maix-III** (~$60-80, when available)
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---
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## Analysis: Why Another Maix Duino K210?
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### Pros ✅
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- **Identical to first unit** - Code reuse, same workflow
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- **Proven solution** - You'll know exactly what to expect
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- **Stock availability** - Still widely available despite being "outdated"
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- **Same accessories** - Microphones, displays, cables compatible
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- **Edge detection ready** - Can upgrade to edge wake word later
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- **Low cost** - ~$30-40 for full kit with LCD and camera
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- **Multi-room consistency** - All units behave identically
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### Cons ❌
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- "Outdated" hardware (but doesn't matter for your use case)
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- Limited future support from Sipeed
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### Verdict: ✅ **RECOMMENDED - Best choice for consistency**
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---
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## Alternative Options
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### Option 1: Another Maix Duino K210
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**Price:** $30-40 (kit with LCD)
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**Where:** AliExpress, Amazon, Seeed Studio
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**Specific Model:**
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- **Sipeed Maix Duino** (original, what you have)
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- Includes: LCD, camera module
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- Need to add: I2S microphone
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**Why Choose:**
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- Identical setup to first unit
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- Code works without modification
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- Same troubleshooting experience
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- Bulk buy discount possible
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**Link Examples:**
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- Seeed Studio: https://www.seeedstudio.com/Sipeed-Maix-Duino-Kit-for-RISC-V-AI-IoT.html
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- AliExpress: Search "Sipeed Maix Duino" (~$25-35)
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---
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### Option 2: Sipeed Maix Bit/Dock (K210 variant)
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**Price:** $15-25 (smaller form factor)
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**Differences from Maix Duino:**
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- Smaller board
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- May need separate LCD
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- Same K210 chip
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- Same capabilities
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**Why Choose:**
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- Cheaper
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- More compact
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- Same software
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**Why Skip:**
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- Need separate accessories
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- Different form factor means different mounting
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- Less convenient than all-in-one Duino
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**Verdict:** ⚠️ Only if you want smaller/cheaper
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---
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### Option 3: ESP32-S3 with Audio Kit
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**Price:** $20-30
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**Chip:** ESP32-S3 (Xtensa dual-core @ 240MHz)
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**Examples:**
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- **ESP32-S3-Box** (~$30) - Has LCD, microphone, speaker built-in
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- **Seeed XIAO ESP32-S3 Sense** (~$15) - Tiny, needs accessories
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- **M5Stack Core S3** (~$50) - Premium, all-in-one
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**Pros:**
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- ✅ More modern than K210
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- ✅ Better WiFi/BLE support
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- ✅ Lower power consumption
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- ✅ Active development
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- ✅ Arduino/ESP-IDF support
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**Cons:**
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- ❌ No KPU (neural accelerator)
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- ❌ Different code needed (ESP32 vs MaixPy)
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- ❌ Less ML capability (for future edge wake word)
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- ❌ Different ecosystem
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**Best ESP32-S3 Choice:** **ESP32-S3-Box**
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- All-in-one like your Maix Duino
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- Built-in mic, speaker, LCD
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- Good for server-side wake word
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- Cheaper than Maix Duino
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**Verdict:** 🤔 Good alternative if you want to experiment
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---
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### Option 4: Raspberry Pi Zero 2 W
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**Price:** $15-20 (board only, need accessories)
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**Pros:**
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- ✅ Full Linux
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- ✅ Familiar ecosystem
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- ✅ Tons of support
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- ✅ Easy Python development
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**Cons:**
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- ❌ No neural accelerator
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- ❌ No dedicated audio hardware
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- ❌ More power hungry (~500mW vs 200mW)
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- ❌ Overkill for audio streaming
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- ❌ Need USB sound card or I2S HAT
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- ❌ Larger form factor
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**Verdict:** ❌ Not ideal for this project
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---
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### Option 5: Sipeed Maix-III AXera-Pi (Future)
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**Price:** $60-80 (when available)
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**Chip:** AX620A (much more powerful than K210)
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**Pros:**
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- ✅ Modern hardware (2023)
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- ✅ Better AI performance
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- ✅ Linux + Python support
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- ✅ Sipeed ecosystem continuity
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- ✅ Great for edge wake word
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**Cons:**
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- ❌ More expensive
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- ❌ Newer = less community support
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- ❌ Overkill for server-side wake word
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- ❌ Stock availability varies
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**Verdict:** 🔮 Future-proof option if budget allows
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---
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### Option 6: Generic ESP32 + I2S Breakout
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**Price:** $10-15 (cheapest option)
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**What You Need:**
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- ESP32 DevKit (~$5)
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- I2S MEMS mic (~$5)
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- Optional: I2S speaker amp (~$5)
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**Pros:**
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- ✅ Cheapest option
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- ✅ Minimal, focused on audio only
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- ✅ Very low power
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- ✅ WiFi built-in
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**Cons:**
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- ❌ No LCD (would need separate)
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- ❌ No camera
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- ❌ DIY assembly required
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- ❌ No neural accelerator
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- ❌ Different code from K210
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**Verdict:** 💰 Budget choice, but less polished
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---
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## Comparison Table
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| Option | Price | Same Code? | LCD | AI Accel | Best For |
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| **Maix Duino K210** | $30-40 | ✅ Yes | ✅ Included | ✅ KPU | **Multi-room consistency** |
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| Maix Bit/Dock (K210) | $15-25 | ✅ Yes | ⚠️ Optional | ✅ KPU | Compact/Budget |
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| ESP32-S3-Box | $25-35 | ❌ No | ✅ Included | ❌ No | Modern alternative |
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| ESP32-S3 DIY | $15-25 | ❌ No | ❌ No | ❌ No | Custom build |
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| Raspberry Pi Zero 2 W | $30+ | ❌ No | ❌ No | ❌ No | Linux/overkill |
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| Maix-III | $60-80 | ⚠️ Similar | ✅ Varies | ✅ NPU | Future-proof |
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| Generic ESP32 | $10-15 | ❌ No | ❌ No | ❌ No | Absolute budget |
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---
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## Recommended Purchase Plan
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### Phase 1: Second Identical Unit (NOW)
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**Buy:** Sipeed Maix Duino K210 (same as first)
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**Cost:** ~$30-40
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**Why:** Code reuse, proven solution, multi-room consistency
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**What to Order:**
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- [ ] Sipeed Maix Duino board with LCD and camera
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- [ ] I2S MEMS microphone (if not included)
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- [ ] Small speaker or audio output (3-5W)
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- [ ] USB-C cable
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- [ ] MicroSD card (4GB+)
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**Total Cost:** ~$40-50 with accessories
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---
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### Phase 2: Third+ Units (LATER)
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**Option A:** More Maix Duinos (if still available)
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**Option B:** Switch to ESP32-S3-Box for variety/testing
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**Option C:** Wait for Maix-III if you want cutting edge
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---
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## Where to Buy Maix Duino
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### Recommended Sellers
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**1. Seeed Studio (Official Partner)**
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- URL: https://www.seeedstudio.com/
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- Search: "Sipeed Maix Duino"
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- Price: ~$35-45
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- Shipping: International, good support
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- **Pro:** Official, reliable, good documentation
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- **Con:** Can be out of stock
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**2. AliExpress (Direct from Sipeed/China)**
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- Search: "Sipeed Maix Duino"
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- Price: ~$25-35
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- Shipping: 2-4 weeks (free or cheap)
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- **Pro:** Cheapest, often bundled with accessories
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- **Con:** Longer shipping, variable quality control
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- **Tip:** Look for "Sipeed Official Store"
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**3. Amazon**
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- Search: "Maix Duino K210"
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- Price: ~$40-50
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- Shipping: Fast (Prime eligible sometimes)
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- **Pro:** Fast shipping, easy returns
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- **Con:** Higher price, limited stock
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**4. Adafruit / SparkFun**
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- May carry Sipeed products
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- Higher price but US-based support
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- Check availability
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---
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## Accessories to Buy
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### Essential (for each unit)
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**1. I2S MEMS Microphone**
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- **Recommended:** Adafruit I2S MEMS Microphone Breakout (~$7)
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- Model: SPH0645LM4H
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- URL: https://www.adafruit.com/product/3421
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- **Alternative:** INMP441 I2S Microphone (~$3 on AliExpress)
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- Cheaper, works well
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- Search: "INMP441 I2S microphone"
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**2. Speaker / Audio Output**
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- **Option A:** Small 3-5W speaker (~$5-10)
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- Search: "3W 8 ohm speaker"
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- **Option B:** I2S speaker amplifier + speaker
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- MAX98357A I2S amp (~$5)
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- 4-8 ohm speaker (~$5)
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- **Option C:** Line out to existing speakers (cheapest)
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**3. MicroSD Card**
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- 4GB or larger
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- FAT32 formatted
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- Class 10 recommended
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- ~$5
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**4. USB-C Cable**
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- For power and programming
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- ~$3-5
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---
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### Optional but Nice
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**1. Enclosure/Case**
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- 3D print custom case
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- Find STL files on Thingiverse
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- Or use small project box (~$5)
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**2. Microphone Array** (for better pickup)
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- 2 or 4-mic array board (~$15-25)
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- Better voice detection
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- Phase 2+ enhancement
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**3. Battery Pack** (for portable testing)
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- USB-C power bank
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- Makes testing easier
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- Already have? Use it!
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**4. Mounting Hardware**
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- Velcro strips
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- 3M command strips
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- Wall mount brackets
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- ~$5
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---
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## Multi-Unit Strategy
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### Same Hardware (Recommended)
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**Buy:** 2-4x Maix Duino K210 units
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**Benefit:**
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- All units identical
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- Same code deployment
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- Easy troubleshooting
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- Bulk buy discount
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**Deployment:**
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- Unit 1: Living room
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- Unit 2: Bedroom
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- Unit 3: Kitchen
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- Unit 4: Office
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### Mixed Hardware (Experimental)
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**Buy:**
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- 2x Maix Duino K210 (proven)
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- 1x ESP32-S3-Box (modern)
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- 1x Maix-III (future-proof)
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**Benefit:**
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- Test different platforms
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- Evaluate performance
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- Future-proofing
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**Drawback:**
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- More complex code
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- Different troubleshooting
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- Inconsistent UX
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**Verdict:** ⚠️ Only if you want to experiment
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---
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## Budget Options
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### Ultra-Budget Multi-Room (~$50 total)
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- 2x Generic ESP32 + I2S mic ($10 each = $20)
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- 2x Speakers ($5 each = $10)
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- 2x SD cards ($5 each = $10)
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- Cables ($10)
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- **Total:** ~$50 for 2 units
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**Pros:** Cheap
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**Cons:** No LCD, DIY assembly, different code
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---
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### Mid-Budget Multi-Room (~$100 total)
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- 2x Maix Duino K210 ($35 each = $70)
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- 2x I2S mics ($5 each = $10)
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- 2x Speakers ($5 each = $10)
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- Accessories ($10)
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- **Total:** ~$100 for 2 units
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**Pros:** Proven, consistent, LCD included
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**Cons:** "Outdated" hardware (doesn't matter for your use)
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---
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### Premium Multi-Room (~$200 total)
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- 2x Maix-III AXera-Pi ($70 each = $140)
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- 2x I2S mics ($10 each = $20)
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- 2x Speakers ($10 each = $20)
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- Accessories ($20)
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- **Total:** ~$200 for 2 units
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**Pros:** Future-proof, modern, powerful
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**Cons:** More expensive, newer = less support
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---
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## My Recommendation
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### For Second Unit: Buy Another Maix Duino K210 ✅
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**Reasoning:**
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1. **Code reuse** - Everything you develop for unit 1 works on unit 2
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2. **Known quantity** - No surprises, you know it works
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3. **Multi-room consistency** - All units behave the same
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4. **Edge wake word ready** - Can upgrade later if desired
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5. **Cost-effective** - ~$40 for full kit with LCD
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6. **Stock available** - Still widely sold despite being "outdated"
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**Where to Buy:**
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- **Best:** AliExpress "Sipeed Official Store" (~$30 + shipping)
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- **Fastest:** Amazon (~$45 with Prime)
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- **Support:** Seeed Studio (~$40 + shipping)
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**What to Order:**
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```
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Shopping List for Second Unit:
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[ ] 1x Sipeed Maix Duino Kit (board + LCD + camera) - $30-35
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[ ] 1x I2S MEMS microphone (INMP441 or SPH0645) - $5-7
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[ ] 1x Small speaker (3W, 8 ohm) - $5-10
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[ ] 1x MicroSD card (8GB+, Class 10) - $5
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[ ] 1x USB-C cable - $3-5
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[ ] Optional: Enclosure/mounting - $5-10
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Total: ~$50-75 (depending on shipping and options)
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```
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---
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### For Third+ Units: Evaluate
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By the time you're ready for 3rd/4th units:
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- You'll have experience with K210
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- You'll know if you want consistency (more K210s)
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- Or variety (try ESP32-S3 or Maix-III)
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- Maix-III may have better availability
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- Prices may have changed
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**Decision:** Revisit when units 1 and 2 are working
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---
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## Future-Proofing Considerations
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### Will K210 be Supported?
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- **MaixPy:** Still actively maintained for K210
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- **Community:** Large existing user base
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- **Models:** Pre-trained models still work
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- **Lifespan:** Good for 3-5+ years
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**Verdict:** ✅ Safe to buy more K210s now
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### When to Switch Hardware?
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Consider switching when:
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- [ ] K210 becomes hard to find
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- [ ] You need better performance (edge ML)
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- [ ] Power consumption is critical
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- [ ] New features require newer hardware
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**Timeline:** Probably 2-3 years out
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---
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## Special Considerations
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### Different Rooms, Different Needs?
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**Living Room (Primary):**
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- Needs: Best audio, LCD display, polish
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- **Hardware:** Maix Duino K210 with all features
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**Bedroom (Secondary):**
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- Needs: Simple, no bright LCD at night
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- **Hardware:** Maix Duino K210, disable LCD at night
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**Kitchen (Ambient Noise):**
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- Needs: Better microphone array
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- **Hardware:** Maix Duino K210 + 4-mic array
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**Office (Minimal):**
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- Needs: Cheap, basic audio only
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- **Hardware:** Generic ESP32 + I2S mic
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### All Same vs Customized?
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**Recommendation:** Start with all same (Maix Duino), customize later if needed.
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---
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## Action Plan
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### This Week
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1. **Order second Maix Duino K210** (~$30-40)
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2. **Order I2S microphone** (~$5-7)
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3. **Order speaker** (~$5-10)
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4. **Order SD card** (~$5)
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**Total Investment:** ~$50-65
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### Next Month
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1. Wait for delivery (2-4 weeks from AliExpress)
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2. Test unit 1 while waiting
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3. Refine code and setup process
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4. Prepare for unit 2 deployment
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### In 2-3 Months
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1. Deploy unit 2 (should be easy after unit 1)
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2. Test multi-room
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3. Decide on unit 3/4 based on experience
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4. Consider bulk order if expanding
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---
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## Summary
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**Buy for Second Unit:**
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- ✅ **Sipeed Maix Duino K210** (same as first) - ~$35
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- ✅ **I2S MEMS microphone** (INMP441) - ~$5
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- ✅ **Small speaker** (3W, 8 ohm) - ~$8
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- ✅ **MicroSD card** (8GB Class 10) - ~$5
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- ✅ **USB-C cable** - ~$5
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**Total:** ~$60 shipped
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**Why:** Code reuse, consistency, proven solution, future-expandable
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**Where:** AliExpress (cheap) or Amazon (fast)
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**When:** Order now, 2-4 weeks delivery
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**Third+ Units:** Decide after testing 2 units (probably buy more K210s)
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---
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## Quick Links
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**Official Sipeed Store (AliExpress):**
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https://sipeed.aliexpress.com/store/1101739727
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**Seeed Studio:**
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https://www.seeedstudio.com/catalogsearch/result/?q=maix+duino
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**Amazon Search:**
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"Sipeed Maix Duino K210"
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**Microphone (Adafruit):**
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https://www.adafruit.com/product/3421
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**Alternative Mic (AliExpress):**
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Search: "INMP441 I2S microphone breakout"
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**Happy Building! 🏠🎙️**
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