Added code for switching between 3.3v and 5v signal output #featureadd

- Fixes #67

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp

@@ -11,10 +11,11 @@
  * PC0 ADC0 (Voltage Reference Check 'A0')
  * PC1 ADC1 (Sensitivity Adjustment Check 'A1')
  * PD4 PCINT20 (Error feedback LED 'D4')
- * PB6 PCINT6 (Voltage Adjustment Resistor 0 'D20')
- * PB7 PCINT7 (Voltage Adjustment Resistor 1 'D21')
- * PD5 T1 (Voltage Adjustment Resistor 2 'D5')
- * PD6 PCINT22 (Voltage Adjustment Resistor 3 'D6')
+ * PB6 PCINT6 (Gain Adjustment Resistor 0 'D20')
+ * PB7 PCINT7 (Gain Adjustment Resistor 1 'D21')
+ * PD5 T1 (Gain Adjustment Resistor 2 'D5')
+ * PD6 PCINT22 (Gain Adjustment Resistor 3 'D6')
+ * PB0 PCINT0 (VCC Adjustment Resistors 'D8')
  * PB1 OC1A (Comparator VRef PWM Out 'D9')
  * PD3 OC2B (Voltage Follower VRef PWM Out 'D3')
 
@@ -36,6 +37,7 @@ To change trigger active duration: TRG_D [integer for milliseconds]
 To change gain factor: GAIN_F [integer for gain state - see note*]
 To change the output logic: LOGIC [0|1] (0 for active low, 1 for active high)
 To enable piezo plugged detection: PZDET [0|1] (0 for disabled, 1 for enabled)
+To set the sensor's output voltage: VCCSW [0|1] (0 for 3.3v, 1 for 5v)
 To change ADC hysteresis value: HYST [integer in millivolts]
 To change sensor input pullup vRef low threshold: VFOL [integer in millivolts]
 To change comparator trigger high threshold: VCOMP [integer in millivolts]
@@ -128,6 +130,8 @@ void setup() {
 
   adjustGain();
 
+  adjustVcc();
+
   digitalWriteFast(TRG_OUT, !LOGIC);
 }
 
@@ -155,6 +159,9 @@ void loop() {
     // Set the amplification gain factor
     adjustGain();
 
+    // Set the VCC input switch
+    adjustVcc();
+
     // Check voltage of first and second stages and compare against thresholds
     readVin();
     VComp = analogReadFast(VCOMP_SENSE_PIN);

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_cmd.h

@@ -93,6 +93,16 @@ void updatePzDet(int value)
 }
 /*------------------------------------------------*/
 
+void updateVccSwitch(int value)
+{
+    if (value >= 0)
+    {
+        VCCSW = value;
+        EEPROM.put(VCCSW_ADDRESS, VCCSW);
+    }
+}
+/*------------------------------------------------*/
+
 void updateConstant(long value)
 {
     if (value >= 0)

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.cpp

@@ -10,6 +10,7 @@ int TRG_DUR = TRG_DUR_DEFAULT;
 int Hyst = HYST_DEFAULT;
 int LOGIC = LOGIC_DEFAULT;
 int PZDET = PZDET_DEFAULT;
+int VCCSW = VCCSW_DEFAULT;
 int Debug = 0;
 long voltMeterConstant = VM_CONST_DEFAULT;
 
@@ -26,6 +27,7 @@ void eraseEEPROM() {
     EEPROM.put(HYST_ADDRESS, Hyst);
     EEPROM.put(PZDET_ADDRESS, PZDET);
     EEPROM.put(LOGIC_ADDRESS, LOGIC);
+    EEPROM.put(VCCSW_ADDRESS, VCCSW);
     EEPROM.put(VM_CONST_ADDRESS, voltMeterConstant);
 }
 
@@ -91,6 +93,13 @@ void restoreConfig() {
         LOGIC = temp;
     }
 
+    EEPROM.get(VCCSW_ADDRESS, temp);
+    if (temp < 0 || temp > 1) {
+        erase = true;
+    } else {
+        VCCSW = temp;
+    }
+
     long longTemp;
     EEPROM.get(VM_CONST_ADDRESS, longTemp);
     if (longTemp < 1000000L || longTemp > 1200000L) {
@@ -116,6 +125,7 @@ void setDefaultConfig() {
     Hyst = HYST_DEFAULT;
     PZDET = PZDET_DEFAULT;
     LOGIC = LOGIC_DEFAULT;
+    VCCSW = VCCSW_DEFAULT;
     voltMeterConstant = VM_CONST_DEFAULT;
     adjustFollow();
     adjustComp();

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.h

@@ -39,9 +39,13 @@ extern int LOGIC; // Trigger logic scheme, Active LOW is default
 #define PZDET_ADDRESS 26
 extern int PZDET; // Enable or disable piezo connection detection, default is off
 
+#define VCCSW_DEFAULT 0
+#define VCCSW_ADDRESS 28
+extern int VCCSW; // Enable or disable piezo connection detection, default is off
+
 extern int Debug;
 
-#define VM_CONST_ADDRESS 28
+#define VM_CONST_ADDRESS 30
 #define VM_CONST_DEFAULT 1125300L
 extern long voltMeterConstant; // For fine tuning input voltage sense
 

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.cpp

@@ -192,6 +192,23 @@ void adjustGain()
 
 /*------------------------------------------------*/
 
+void adjustVcc()
+{
+  switch (VCCSW)
+  {
+  case 0:
+    pinMode(VCCSW_PIN, OUTPUT);
+    digitalWriteFast(VCCSW_PIN, LOW);
+    break;
+  case 1:
+  default:
+    pinMode(VCCSW_PIN, INPUT);
+    break;
+  }
+}
+
+/*------------------------------------------------*/
+
 //void checkError () {
 //  if (ERR_STATE == 1) {
 //    digitalWriteFast(ERR_LED, BlinkState);

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h

@@ -36,6 +36,7 @@ update the voltMeterConstant variable in pP_config.h with the correct value
 void readVin();
 void adjustFollow();
 void adjustComp();
+void adjustVcc();
 void calibrateAlert();
 void adjustGain();
 //void checkError () {

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_pins.h

@@ -30,4 +30,5 @@ Default pins (based on Rev.2.x.xPCB layout)
 #define GADJ_R3 6         // "
 #define V_FOL_PWM 3       // PWM analog output pin for voltage follower adjustment
 #define VCOMP_PWM 9       // PWM analog output pin for comparator adjustment
-#define PZDET_PIN 16      // Digital input pin for detecting piezo connection
+#define PZDET_PIN 16      // Digital input pin for detecting piezo connection
+#define VCCSW_PIN 8       // VCC variable regulator switch pin

firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_serial.h

@@ -108,6 +108,21 @@ void serialPrintConfig()
 
   Serial.print("PZDET ");
   Serial.println(PZDET);
+  
+  Serial.print("VCCSW ");
+  Serial.print(VCCSW);
+  switch (VCCSW)
+  {
+  case 0:
+    Serial.println(" 3.3v");
+    break;
+  case 1:
+    Serial.println(" 5v");
+    break;
+  default:
+    Serial.println(" INVALID");
+    break;
+  }
 
   Serial.print("VM_CONST ");
   Serial.println(voltMeterConstant);
@@ -182,6 +197,10 @@ void updateParams()
   {
     updatePzDet(serialLong);
   }
+  else if (strcmp(serialMessageIn, "VCCSW") == 0)
+  {
+    updateVccSwitch(serialLong);
+  }
   else if (strcmp(serialMessageIn, "CONST") == 0)
   {
     updateConstant(serialLong);
@@ -215,6 +234,8 @@ void updateParams()
     Serial.println("  (0 for active low, 1 for active high)");
     Serial.println("To enable piezo plugged detection: PZDET [0|1]");
     Serial.println("  (0 for disabled, 1 for enabled)");
+    Serial.println("To change the main voltage of the circuit: VCCSW [0|1]")
+    Serial.println("  (0 for 3.3v, 1 for 5v)");
     Serial.println("To change ADC hysteresis value: HYST [integer in millivolts]");
     Serial.println("To enable or disable debug output: DEBUG [0|1]");
     Serial.println("To print current config: CONFIG");