:q

firmware/v01/v01.ino

@@ -15,6 +15,7 @@ Tue Jun 12 14:56:12 GMT 2018
 
 
 // Configuration of pins, insert here arduino pin numbers only(not fisical)----------------------------
+#define i_load 6						// Analog pin for the load current
 #define v_batt 7						// Analog pin for the battery voltage
 #define volt_1 0						// Analog pin for voltage 1
 #define volt_2 1						// Analog pin for voltage 2
@@ -27,11 +28,22 @@ LiquidCrystal lcd(7, 6, 2, 3, 4, 5);	// LCD screen pins, LiquidCrystal(rs, enabl
 
 
 // Other configurations ------------------------------------------------------------------------------------
-#define battery_volt 3				// Parameter position where battery voltage value is hold
 #define voltage_1 0					// Parameter position where voltage one value is hold
 #define voltage_2 1					// Parameter position where voltage two value is hold
+#define curr 2						// Parameter position where load current value is hold
+#define battery_volt 3				// Parameter position where battery voltage value is hold
 #define numOfScreens 7				// Number of screen menus, select here and rearrange String screens
-File myFile;
+#define delay_loop 4000				// Value in miliseconds for the main loop routine
+#define sd_not_in 0					// SD card is not inserted
+#define sd_in 1						// SD card is inserted
+#define file_fail 2					// Can't write to file
+#define writing 3					// Write on the sd card
+#define curr_limit 2				// Maximum current allowed
+#define off 0						// off is always zero
+#define on 1						// on is always one
+#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
 //----------------------------------------------------------------------------------------------------------
 
 
@@ -39,23 +51,13 @@ File myFile;
 #define rLEFT digitalRead(LEFT)     // Read button Left
 #define rRIGHT digitalRead(RIGHT)   // Read button Right
 #define rACT digitalRead(ACT)		// Read button Action
-#define sd_not_in 0					// SD card is not inserted
-#define sd_in 1						// SD card is inserted
-#define file_fail 2					// Can't write to file
-#define writing 3					// Write on the sd card
-#define load_off 0					// Turn off the load
-#define load_on 1					// Turn on the load
-#define off 0						// off is always zero
-#define on 1						// on is always one
-#define no 0						// no is always zero
-#define yes 1						// yes is alyays one
 //----------------------------------------------------------------
 
 
 // Variables --------------------------------------------------------------------------------------------------------------
 bool sd_rw = off;					// Holds the state of read/write of the card
-bool load_status = load_off;		// Holds the state of on/off of the load
+bool load_status = off;				// Holds the state of on/off of the load
-bool sd_inserted = no;				// Holds the stats if sd card is in or not
+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
@@ -67,9 +69,10 @@ String screens[numOfScreens][2] = {{"Voltage 1","Volts"}, {"Voltage 2","Volts"},
 String parameters_sd[2] = {"No","Yes"};									// String to display the sd card logging
 String parameters_load[2] = {"Off","On"};								// String to display the load state
 String sd_card[4] = {"Card missing","Card inserted","File Write fail","Writing..."}; // String to display the sd card state
+String file_name = "measures";											// Initial file name only 8 characters allowed
 float parameters[4];													// Parameters of the several voltages and current
 
-float denominator;
+float denominator;					// Denominator to calculate the voltage divider
 int resistor1 = 22000;				// Resistor one of voltage divider
 int resistor2 = 2200;				// Resistor two of voltage divider
 // ------------------------------------------------------------------------------------------------------------------------
@@ -77,9 +80,11 @@ int resistor2 = 2200;				// Resistor two of voltage divider
 
 
 // Function declarations --------------------------------------------------
-void menuState(void);				// Read buttons and update menu
+void menuState(void);															// Read buttons and update menu
-void printScreen (void);			// Print menus and variables on screen
+void printScreen (void);														// Print menus and variables on screen
-float volt_pin (int pin);			// Read and display voltage
+float volt_pin (int pin);														// Read and display voltage
+float amp_pin (int pin);														// Read and display current
+float fmap(float x, float in_min, float in_max, float out_min, float out_max);	// Calculate current opamp
 //-------------------------------------------------------------------------
 
 
@@ -91,7 +96,7 @@ void setup()
 	pinMode(ACT, INPUT);			// Button act is an input
 	pinMode(load_line, OUTPUT);		// load_line is an output
 
-	lcd.begin(16, 2);
+	lcd.begin(16, 2);				// Start LCD display with 16 characters and 2 lines
 
 	// Voltage divider -->  Vout = Vin * R2 / R1 + R2
 	denominator = (float)resistor2 / (resistor1 + resistor2);
@@ -125,8 +130,12 @@ void setup()
 // Timer compare interrupt service routine --
 ISR(TIMER1_COMPA_vect)
 {
-	menuState();							// Read buttons act accordingly and update menus
+	menuState();								// Read buttons act accordingly and update menus
-	digitalWrite(load_line, load_status);	// Turn load on or off depending on the load_status
+	if (amp_pin(i_load) > curr_limit)			// If load current more then current limit
+	{
+		load_status = off;						// Turn off load
+	}
+		digitalWrite(load_line, load_status);	// Turn load on or off depending on the load_status
 }
 //-------------------------------------------
 
@@ -136,7 +145,7 @@ void loop()
 	parameters[battery_volt] = volt_pin(v_batt);		// Update Battery voltage value
 	parameters[voltage_1] = volt_pin(volt_1);			// Update voltage one value
 	parameters[voltage_2] = volt_pin(volt_2);			// Update voltage two value
-
+	parameters[curr] = amp_pin(i_load);					// Update current load
 
 	if (sd_inserted == no)								// If sd_rw value is turned on
 	{
@@ -144,8 +153,8 @@ void loop()
 	}
 	else if (sd_rw == on)
 	{
-		myFile = SD.open("measure.txt", FILE_WRITE);	// Open file measure.txt for writing
+		myFile = SD.open(file_name + ".TXT", FILE_WRITE);	// Open file name and add ".TXT", for writing
-		if (myFile)										// if succeds
+		if (myFile)											// if succeds
 		{
 			myFile.print("Batt voltage, ");
 			myFile.println(volt_pin(v_batt));			// Write to card battery voltage
@@ -153,6 +162,8 @@ void loop()
 			myFile.println(volt_pin(volt_1));			// Write to card voltage one
 			myFile.print("Voltage two,  ");
 			myFile.println(volt_pin(volt_2));			// Write to card voltage two
+			myFile.print("Load current,  ");
+			myFile.println(amp_pin(i_load));			// Write to card load current
 			myFile.println("");							// Write to card an empty line
 			myFile.close();								// Close file
 			sd_status = writing;
@@ -168,7 +179,7 @@ void loop()
 	}
 
 	printScreen();										// Refresh screen and print current menu and values
-	delay(5000);										// Repeat the main loop every 5 seconds
+	delay(delay_loop);									// Repeat the main loop every delay_loop seconds
 }
 
 void menuState()
@@ -254,3 +265,22 @@ float volt_pin(int pin)
 
 	return voltage;
 }
+
+
+float amp_pin (int pin)
+{
+	int readAmpsADC = 0;
+	float amps = 0.0;
+
+	readAmpsADC = analogRead(pin);
+	amps = fabs(fmap(readAmpsADC, 0.0, 1023.0, 0.01, 3.3));
+
+	return amps;
+}
+
+
+float fmap(float x, float in_min, float in_max, float out_min, float out_max)
+{
+	return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+