Added led indicators

firmware/modbus-sd/modbus-sd-pm8000/modbus-sd-pm8000.ino

@@ -17,6 +17,8 @@
 #define TX_PIN 7 // SoftwareSerial TX pin
 #define SLAVE_ID 101
 #define SERIAL_BAUDRATE 9600
+#define LED_A_PID 3
+#define LED_B_PID 5
 
 // Try to select the best SD card configuration.
 #define SPI_CLOCK SD_SCK_MHZ(50)
@@ -38,8 +40,22 @@ ModbusMaster node;
 unsigned long lastRefreshTime = 0;
 bool headerWritten = false;
 
+void flicker(uint8_t pin ,uint8_t  times , uint16_t speed  ) {
+  for (int i = 0; i < times; i++) {
+    digitalWrite(pin, HIGH);
+    delay(speed);
+    digitalWrite(pin, LOW);
+    delay(speed);
+  }
+}
+
 void setup()
 {
+  pinMode(LED_A_PID, OUTPUT);
+  pinMode(LED_B_PID, OUTPUT);
+  digitalWrite(LED_A_PID, LOW);
+  digitalWrite(LED_B_PID, HIGH);
+
   Serial.begin(SERIAL_BAUDRATE); // For debugging
   Serial.println(F("Startup \n"));
 
@@ -47,6 +63,7 @@ void setup()
   if (!rtc.begin())
   {
     Serial.println(F("Couldn't find RTC\n"));
+    flicker(LED_B_PID,4,500); //4 times on LED b is RTC Error
   }
 
   if (rtc.lostPower())
@@ -54,6 +71,7 @@ void setup()
     Serial.println(F("RTC lost power, let's set the time!\n"));
     // Comment out the following line once the time is set to avoid resetting on every start
     rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
+    flicker(LED_B_PID,4,100); //4 times fast on LED b is RTC reset
   }
 
   Serial.print(F("Time: "));
@@ -73,6 +91,7 @@ void setup()
   if (!sd.begin(SD_CONFIG))
   {
     sd.initErrorHalt(&Serial);
+    flicker(LED_B_PID,2,500);  //2 Times slow, SD Card initilize error
     return;
   }
   Serial.println(F("SD card initialized.\n"));
@@ -86,18 +105,21 @@ void setup()
   node.begin(SLAVE_ID, modbusSerial);
   node.preTransmission(preTransmission);
   node.postTransmission(postTransmission);
+  flicker(LED_A_PID,2,100);
 }
 
 void preTransmission()
 {
   // Serial.println(F("Transmitting Start"));
   digitalWrite(DE_RE_PIN, HIGH); // Enable RS485 transmit
+  digitalWrite(LED_A_PID, HIGH);
 }
 
 void postTransmission()
 {
 
   digitalWrite(DE_RE_PIN, LOW); // Disable RS485 transmit
+  digitalWrite(LED_A_PID, LOW);
   // Serial.println(F("Transmitting End"));
 }
 
@@ -160,6 +182,7 @@ void loop()
     Serial.print("\n");
     if (!dataFile.open(filename.c_str(), FILE_WRITE))
     {
+      flicker(LED_B_PID,6,100); //Six quick flickers. SD Card error
       Serial.println(F("Failed to Open Card "));
     }
     if (!headerWritten)
@@ -173,6 +196,7 @@ void loop()
         dataFile.print(",");
       }
       headerWritten = true;
+      flicker(LED_A_PID,50,10); //10  flickers, written header
     }
     primeFileDate();
     Serial.print("\n");
@@ -242,7 +266,7 @@ void loop()
 
     Serial.print(F("\n\n"));
 
-    delay(100);
+    flicker(LED_A_PID,4,10); //Cycle written 4 quick flickers
   }
 
   // // Check if the read was successful