/********************************************************************* Powertester Measures 2 voltages and current from an equipment(Load), and logs the results on SD card. Control and read values from bluetooth. By Jony Silva Tue Jun 12 14:56:12 GMT 2018 *********************************************************************/ // Libraries to be included, non native libraries need to be included in the Makefile #include #include // Handles the connection and communications with the LCD display #include // Handles the SPI connection to the SD card #include // Handles communication routines with the SD card #include // Handles serial communications thru software // 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 #define load_line 17 // Line that turns load On or Off #define LEFT 16 // Button 1 will be function Left #define RIGHT 18 // Button 2 will be function Right #define ACT 19 // Button 3 will be function Action #define BLUE_RX 8 // Arduino rx serial line to bluetooth #define BLUE_TX 9 // Arduino tx serial line to bluetooth LiquidCrystal lcd(7, 6, 2, 3, 4, 5); // LCD screen pins, LiquidCrystal(rs, enable, d4, d5, d6, d7) //----------------------------------------------------------------------------------------------------- // Other configurations --------------------------------------------------------------------------- #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 #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 SoftwareSerial mySerial(BLUE_RX, BLUE_TX); // Start file descriptor and assign pins to bluetooth module //------------------------------------------------------------------------------------------------- // Macros -------------------------------------------------------- #define rLEFT digitalRead(LEFT) // Read button Left #define rRIGHT digitalRead(RIGHT) // Read button Right #define rACT digitalRead(ACT) // Read button Action //---------------------------------------------------------------- // Variables -------------------------------------------------------------------------------------- bool sd_rw = off; // Holds the state of read/write of the card bool load_status = off; // Holds the state of on/off of the load 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'; // Holds a character received by bluetooth // String with the menus to be displayed String screens[numOfScreens][2] = {{"Voltage 1","Volts"}, {"Voltage 2","Volts"}, {"Load current","Amps"},{"Batt Voltage","volts"}, {"SD Logging", ""}, {"Load", ""}, {"SD card", ""}}; 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; // 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]; // String output to bluetooth converted from float // ----------------------------------------------------------------------------------------------- // Function declarations -------------------------------------------------- void menuState(void); // Read buttons and update menu void printScreen (void); // Print menus and variables on screen 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 //------------------------------------------------------------------------- void setup() { pinMode(LEFT, INPUT); // Button left is an input pinMode(RIGHT, INPUT); // Button right is an input pinMode(ACT, INPUT); // Button act is an input pinMode(load_line, OUTPUT); // load_line is an output 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); // initialize timer1 --------------------------------------- noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = 0; OCR1A = 9000; // Load value to compare TCCR1B |= (1 << WGM12); // CTC mode TCCR1B |= (1 << CS10); // 64 prescaler TCCR1B |= (1 << CS11); // TIMSK1 |= (1 << OCIE1A); // enable timer compare interrupt interrupts(); // enable all interrupts // ---------------------------------------------------------- if (SD.begin()) // Initiate SD card { sd_status = sd_in; // If sd card is initiated successfully change variable sd_in sd_inserted = yes; // and change variable sd_inserted to yes } else { sd_status = sd_not_in; // If sd card is not initiated change variable to sd_not_in sd_inserted = no; // and change variable sd_inserted to no } } // Timer compare interrupt service routine -- ISR(TIMER1_COMPA_vect) { menuState(); // Read buttons act accordingly and update menus 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 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; } } } //------------------------------------------- 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 Serial.write(ble_data); // For debug only if (sd_inserted == no) // If SD card is not inserted { sd_status = sd_not_in; // change card status to sd card not inserted } else if (sd_rw == on) // otherwise sd_rw is ON { myFile = SD.open(file_name + ".TXT", FILE_WRITE); // Open file name and add ".TXT", // for writing if (myFile) // if succeds { myFile.print("Batt voltage, "); // Write string to card myFile.println(volt_pin(v_batt)); // Write to card battery voltage myFile.print("Voltage one, "); // Write string to card myFile.println(volt_pin(volt_1)); // Write to card voltage one myFile.print("Voltage two, "); // Write string to card myFile.println(volt_pin(volt_2)); // Write to card voltage two myFile.print("Load current, "); // Write string to card 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; // change card status to, writing } else { sd_status = file_fail; // otherwise change card status to, failed } } else { sd_status = sd_in; // otherwise change card status to, card inserted } printScreen(); // Refresh screen and print current menu and values delay(delay_loop); // Repeat the main loop every delay_loop seconds } // Function that checks in what menu we are and wich button was pressed, // in case button Right was pressed menu will rotate to the right // in case button Left was pressed menu will rotate to the left // in case button Action was pressed and we are on the fourth SD card menu, the card // writing can be toggled between No and Yes // in case button Action was pressed and we are on the fifth Load menu, the load // can be toggled between On and Off void menuState() { if (!rRIGHT) // if button Right is pressed { if (currentScreen == (numOfScreens - 1)) // check if its in the last screen { currentScreen = 0; // then change to first screen } else { currentScreen++; // otherwise increment screen } while (!rRIGHT); // Check if button is still pressed do nothing printScreen(); // Refresh screen and print current menu and values } if (!rLEFT) // if button Right is pressed { if (currentScreen == 0) // check if its the first screen { currentScreen = (numOfScreens - 1); // then change screen to last screen } else { currentScreen--; // otherwise decrement screen } while (!rLEFT); // Check if button is still pressed do nothing printScreen(); // Refresh screen and print current menu and values } if (!rACT) // if button Action is pressed { if (currentScreen == 4) // check if is fourth screen { sd_rw = !sd_rw; // toggle read/write on SD card } if (currentScreen == 5) // check if is fith screen { load_status = !load_status; // toggle ON/OFF load } while (!rACT); // Check if button is still pressed do nothing printScreen(); // Refresh screen and print current menu and values } } // Function that checks the currentscreen scanned in function menuState() // and prints on the LCD the corresponding strings for the currentScreen void printScreen() { lcd.clear(); // Clear the LCD lcd.print(screens[currentScreen][0]); // Print the current screen first line lcd.setCursor(0,1); // move the LCD cursor to the second line if (currentScreen == 4) // check if current screen is number 4 { lcd.print(parameters_sd[sd_rw]); // print content of parameters_sd string to second line } else if (currentScreen == 5) // check if current screen is number 5 { lcd.print(parameters_load[load_status]); // print content of parameters_load string to second line } else if (currentScreen == 6) // check if current screen is number 6 { lcd.print(sd_card[sd_status]); // print content of sd_card string to second line } else { // otherwise lcd.print(parameters[currentScreen]); // print content of parameters string to second line lcd.print(" "); // print one blank space lcd.print(screens[currentScreen][1]); // and print content of screens second string } } // Function that takes an analogue pin number, reads and converts to real voltage value // and returns it as a float float volt_pin(int pin) { float voltage; voltage = analogRead(pin); // Obtain RAW voltage data voltage = (voltage / 1024) * 3.3; // Convert to actual voltage voltage = voltage / denominator; // Convert to voltage after divider return voltage; // return the final real voltage } // Function that takes an analogue pin number, reads and converts to real amperage value // and returns it as a float float amp_pin (int pin) { int readAmpsADC = 0; // variable that holds the value read on analogue pin float amps = 0.0; // variable that holds final amperage value readAmpsADC = analogRead(pin); // read pin and store value on variable readAmpsADC amps = fabs(fmap(readAmpsADC, 0.0, 1023.0, 0.01, 3.3)); // function to convert from the analogue value to real amperage value return amps; // return the final real amperage } // Function that takes in, analogue pin value, minimum ADC value, maximum ADC value, minimum voltage, maximum voltage // and returns the raw value 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; // return the raw amperage value }