Got arduino to respond to bluetooth commands sent from android. Show values back on android and turn on and off load.

firmware/v01/v01.ino

@@ -9,6 +9,7 @@ Tue Jun 12 14:56:12 GMT 2018
 *********************************************************************/
 
 // Libraries to be included, non native libraries need to be included in the Makefile
+#include <stdlib.h>
 #include <LiquidCrystal.h>		// Handles the connection and communications with the LCD display
 #include <SPI.h>			// Handles the SPI connection to the SD card
 #include <SD.h>				// Handles communication routines with the SD card
@@ -47,6 +48,7 @@ LiquidCrystal lcd(7, 6, 2, 3, 4, 5);	// LCD screen pins, LiquidCrystal(rs, enabl
 #define no 0				// no is always zero
 #define yes 1				// yes is alyays one
 File myFile;				// Initiate the object File to write in the SD card
+SoftwareSerial mySerial(BLUE_RX, BLUE_TX); // Start file descriptor and assign pins to bluetooth module
 //-------------------------------------------------------------------------------------------------
 
 
@@ -64,6 +66,7 @@ bool sd_inserted = no;			// Holds the state if sd card is in or not
 int sd_status = sd_not_in;		// Holds information about the sd card
 
 int currentScreen = 0;			// Current display menu
+char ble_data = 'Z';
 
 // String with the menus to be displayed
 String screens[numOfScreens][2] = {{"Voltage 1","Volts"}, {"Voltage 2","Volts"},
@@ -78,6 +81,7 @@ float parameters[4];													// Parameters of the several voltages and curre
 float denominator;			// Denominator to calculate the voltage divider
 int resistor1 = 22000;			// Resistor one of voltage divider
 int resistor2 = 2200;			// Resistor two of voltage divider
+static char outstr[15];
 // -----------------------------------------------------------------------------------------------
 
 
@@ -101,6 +105,9 @@ void setup()
 
 	lcd.begin(16, 2);			// Start LCD display with 16 characters and 2 lines
 
+	mySerial.begin(9600);			// Start serial connection to bluetooth module
+	Serial.begin(9600);			// For debug only
+
 	// Voltage divider -->  Vout = Vin * R2 / R1 + R2
 	denominator = (float)resistor2 / (resistor1 + resistor2);
 
@@ -139,6 +146,34 @@ ISR(TIMER1_COMPA_vect)
 		load_status = off;			// Turn off load
 	}
 		digitalWrite(load_line, load_status);	// Turn load on or off depending on the load_status
+
+	if (mySerial.available()) {
+		ble_data = mySerial.read();	
+		Serial.write(mySerial.read());
+		if (ble_data == 'A') {
+			dtostrf(parameters[battery_volt], 5, 2, outstr);
+			mySerial.write(outstr);	
+		}
+		if (ble_data == 'B') {
+			dtostrf(parameters[voltage_1], 5, 2, outstr);
+			mySerial.write(outstr);	
+		}
+		if (ble_data == 'C') {
+			dtostrf(parameters[voltage_2], 5, 2, outstr);
+			mySerial.write(outstr);	
+		}
+		if (ble_data == 'D') {
+			dtostrf(parameters[curr], 5, 2, outstr);
+			mySerial.write(outstr);	
+		}
+		if (ble_data == 'E') {
+			load_status = on;	
+		}
+		if (ble_data == 'F') {
+			load_status = off;	
+		}
+	}
+	
 }
 //-------------------------------------------
 
@@ -150,13 +185,19 @@ void loop()
 	parameters[voltage_2] = volt_pin(volt_2);	// Update voltage two value
 	parameters[curr] = amp_pin(i_load);		// Update current load
 
+	
+	
+
+	Serial.write(ble_data);				// For debug only
+
 	if (sd_inserted == no)				// If sd_rw value is turned on
 	{
 		sd_status = sd_not_in;
 	}
 	else if (sd_rw == on)
 	{
-		myFile = SD.open(file_name + ".TXT", FILE_WRITE);	// Open file name and add ".TXT", for writing
+		myFile = SD.open(file_name + ".TXT", FILE_WRITE);	// Open file name and add ".TXT", 
+									// for writing
 		if (myFile)						// if succeds
 		{
 			myFile.print("Batt voltage, ");