Added piezo disk connection detection #featureadd

 - First implementation for #46

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

@@ -112,6 +112,7 @@ void setup() {
 
   pinMode(TRG_OUT, OUTPUT);       // declare the Trigger as as OUTPUT
   pinMode(ERR_LED, OUTPUT);
+  pinMode(PZDET_PIN, INPUT);
   pinMode(Z_TRG, INPUT_PULLUP);   // declare z-sense input with pullup
   pinMode(V_FOLLOW_PIN, INPUT);
   pinMode(VCOMP_SENSE_PIN, INPUT);
@@ -171,6 +172,9 @@ void loop() {
       ERR_STATE = 0;
     }
 
+    // Check that the piezo disk is properly connected
+    pzConCheck();
+
     // Blink LED's on init
     if (BlinkCount > 0) {
       BlinkState = !BlinkState;

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

@@ -10,6 +10,7 @@ int LOOP_DUR = LOOP_DUR_DEFAULT; // duration of time between ADC checks and othe
 int TRG_DUR = TRG_DUR_DEFAULT;   // duration of the Z-axis pulse sent, in ms
 int Hyst = HYST_DEFAULT;         // Hysteresis value for ADC measurements
 bool LOGIC = LOGIC_DEFAULT;      // Trigger output logic (active low or active high)
+bool PZDET = PZDET_DEFAULT;      // Enable/disable piezo connection detection
 int Debug = 0;
 long voltMeterConstant = VM_CONST_DEFAULT;
 uint8_t pP_i2c_address = 0xa0;
@@ -25,6 +26,7 @@ void eraseEEPROM() {
     EEPROM.put(TRG_DUR_ADDRESS, TRG_DUR);
     EEPROM.put(HYST_ADDRESS, Hyst);
     EEPROM.put(LOGIC_ADDRESS, LOGIC);
+    EEPROM.put(PZDET_ADDRESS, PZDET);
     EEPROM.put(VM_CONST_ADDRESS, voltMeterConstant);
 }
 
@@ -83,6 +85,13 @@ void restoreConfig() {
         LOGIC = temp;
     }
 
+    EEPROM.get(PZDET_ADDRESS, temp);
+    if (temp < 0 || temp > 1) {
+        erase = true;
+    } else {
+        PZDET = temp;
+    }
+
     long longTemp;
     EEPROM.get(VM_CONST_ADDRESS, longTemp);
     if (longTemp < 1000000L || longTemp > 1200000L) {
@@ -107,6 +116,7 @@ void setDefaultConfig() {
     TRG_DUR = TRG_DUR_DEFAULT;
     Hyst = HYST_DEFAULT;
     LOGIC = LOGIC_DEFAULT;
+    PZDET = PZDET_DEFAULT;
     voltMeterConstant = VM_CONST_DEFAULT;
     adjustFollow();
     adjustComp();

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

@@ -49,6 +49,12 @@
   extern bool LOGIC; // Trigger logic scheme, Active LOW is default
 #endif
 
+#define PZDET_DEFAULT 0
+#define PZDET_ADDRESS 26
+#if !(defined(PZDET))
+  extern bool PZDET; // Enable or disable piezo connection detection, default is off
+#endif
+
 #if !(defined(Debug))
   extern int Debug;
 #endif

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

@@ -174,3 +174,15 @@ void checkError () {
     digitalWriteFast(ERR_LED, BlinkState);
   }
 }
+
+/*------------------------------------------------*/
+
+void pzConCheck () {
+  PZ_STATE = digitalRead(PZDET_PIN)
+  if (PZ_STATE == 1) {
+    digitalWriteFast(TRG_OUT, LOGIC);
+    ERR_STATE = 1;
+  }
+}
+
+/*------------------------------------------------*/

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

@@ -29,4 +29,5 @@ Default pins (based on Rev.2.x.xPCB layout)
 #define GADJ_R2 5         // "
 #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 VCOMP_PWM 9       // PWM analog output pin for comparator adjustment
+#define PZDET_PIN 16      // Digital input pin for detecting piezo connection

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

@@ -110,6 +110,22 @@ void updateHysteresis() {
 }
 /*------------------------------------------------*/
 
+void updateLogic() {
+  if (serialLong >= 0) {
+    Hyst = serialLong;
+    EEPROM.put(LOGIC_ADDRESS, LOGIC);
+  }
+}
+/*------------------------------------------------*/
+
+void updatePzDet() {
+  if (serialLong >= 0) {
+    Hyst = serialLong;
+    EEPROM.put(PZDET_ADDRESS, PZDET);
+  }
+}
+/*------------------------------------------------*/
+
 void updateConstant() {
   if (serialLong >= 0) {
     voltMeterConstant = (long) serialLong;
@@ -168,6 +184,12 @@ void serialPrintConfig() {
   Serial.print("HYST ");
   Serial.println(Hyst);
 
+  Serial.print("LOGIC ");
+  Serial.println(LOGIC);
+
+  Serial.print("PZDET ");
+  Serial.println(PZDET);
+
   Serial.print("VM_CONST ");
   Serial.println(voltMeterConstant);
 }
@@ -190,6 +212,9 @@ void serialPrintState() {
   Serial.print("\"Err\":");
   Serial.print(ERR_STATE);
 
+  Serial.print("\"PzCon\":");
+  Serial.print(PZ_STATE);
+
   Serial.println("}");
 }
 
@@ -213,6 +238,12 @@ void updateParams() {
   else if (strcmp(serialMessageIn, "HYST") == 0) {
     updateHysteresis();
   }
+  else if (strcmp(serialMessageIn, "LOGIC") == 0) {
+    updateLogic();
+  }
+  else if (strcmp(serialMessageIn, "PZDET") == 0) {
+    updatePzDet();
+  }
   else if (strcmp(serialMessageIn, "CONST") == 0) {
     updateConstant();
   }

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

@@ -3,6 +3,7 @@ volatile int sensorHReading = 0;      // variable to store the value read from t
 volatile int ADJ_FOLLOW = 0;          // Variable for Follower adjustment
 volatile int ADJ_COMP = 0;            // Variable for Comparator adjustment
 volatile int ERR_STATE = 0;
+volatile int PZ_STATE = 0;
 
 int Vin = 5000;                   // input reference voltage in millivolts (multiply V by 1000)
 int VOld = 5000;                  // Variable to store previous cycle's Vin
@@ -26,6 +27,7 @@ int VFol = 0;
 int BlinkState = 0;
 int BlinkCount = (InitCount * 2) + 1;   // Multiply Blink count by 2 to handle toggle state, add one extra to make sure light is on after
 
+
 // Serial Input Parsing Variables
 #define buffSize 40
 char inputBuffer[buffSize];