String formatting

Projects Programming
8

the sketch is work in progress. I had written the whole program for pic and now i am converting little by little to arduino nano. the code so far

#include<LiquidCrystal.h>
#include <avr/interrupt.h>
#include <avr/io.h>
//#include <cstdio.h>
LiquidCrystal lcd (7,8,9,10,11,12); // Define LCD display pins RS, E, D4, D5, D6, D7
const int SpeedoPin = 2;
const int MenuPin = 6;
const int PlusPin = 5;
const int MinusPin = 4;
const int BuzzPin = 3;
volatile unsigned long millis_count = 0;
unsigned int a = 0, volts = 0, vadc, save_maH, batt_cap, amps;
float mAsec;
unsigned char flag_200ms = 0;                                                   // set HIGH once 0.2 second (200ms)
unsigned char charging_flag;                                                    // 1=charging, 0=discharging

void SpeedoIn();
void power_calc();
void display_va( char col, char row, unsigned long value, char type);
void display_percent_watt(char row, char col, unsigned int value, char type);


void setup() {
  // put your setup code here, to run once:
  // Disable Global Interrupts
  //cli();
  noInterrupts();
  // Set Timer1 to Normal Mode
  TCCR1A = 0; // Set Entire TCCR1A register to 0
  TCCR1B = 0; //(1 << WGM12); // Set Entire TCCR1B register to 0
  TCCR1B |= B00000001; // Prescaler = 1
  TCNT1 = 49535;  // Timer Preloading
  TIMSK1 |= B00000001;
  
  
  // Enable Global Interrupts
  //sei();
  interrupts();
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(BuzzPin, OUTPUT);
  pinMode(SpeedoPin, INPUT_PULLUP);
  pinMode(MenuPin, INPUT_PULLUP);
  pinMode(PlusPin, INPUT_PULLUP);
  pinMode(MinusPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2),SpeedoIn,CHANGE);
  Serial.begin(9600);
  lcd.begin(20,4);
  //lcd.setCursor(5, 0);
  //lcd.print("V");
  //lcd.setCursor(13, 0);
  //lcd.print("A");
  //lcd.setCursor(19, 0);
  //lcd.print("W");
  lcd.setCursor(6, 1);
  lcd.print("mA");
  lcd.setCursor(0, 2);
  lcd.print("E");
  lcd.setCursor(9, 2);
  lcd.print("F");

}

void loop() {
  // put your main code here, to run repeatedly:
  power_calc();
  delay(200);
}

ISR(TIMER1_OVF_vect){
  TCNT1 = 49535;
  // Increment the millisecond counter
  millis_count++;
  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
}

ISR(TIMER1_COMPA_vect){
  millis_count++;
}


void power_calc(){

  unsigned long int wt = 000;
  //float amps;// = 00.00;
  unsigned int amps;
  float volts = 00.00;
  char va[] = "00.00 ";
   unsigned char sign;
    
    vadc = analogRead(A0);                                                         // Read AN0/RA0 for voltage
    volts = vadc * 4.89;
    volts = volts / 100;
    //volts = (vadc /1023) * 5;
    a = analogRead(A3);                                                            // Read AN2/RA2 for current
    if (a >= 511){
        amps = (float)(((a - 511) * 4.89) / 6.6);                            // ACS712-30A=6.6,20A=10
        sign = "-";                                                             // Battery Discharging
        charging_flag = 0;                                                      // show that battery is discharging
    }
    else if (a < 510){
        amps = (float)(((511 - a) * 4.89) / 6.6);
        sign = "+";                                                             // Battery Charging
        charging_flag = 1;                                                      // show that battery is charging
    }
    
    //amps += current;
    mAsec = (float)(amps / 180);                                             // mA/0.2Sec

     //if(DspUpdInt > 4){                                                         // Display Voltage,Current,Watts every 1 Second
        //////////////////////
        //***LCD Line 1 ***//
        /// Voltage Display ///
        //volts = volts /5 ;                                                      // Voltage to display
        //display_va(0, 0, volts, "V");
        //lcd.setCursor(0, 0);
        //lcd.print(sign);
        lcd.setCursor(0, 0);
        lcd.print(String(volts) + "V");
		
        /// Display  Current ///
        amps = (amps * 10);
        //lcd.setCursor(7, 0);
        //lcd.print("+" + (String(amps)) + "A");
        //display_va(9, 0, amps, "A");
        /// Display Wattage  ///
        

        va[0] = (amps/1000);
        va[1] = ((amps/100)%10);
        //va[2] = ".";
        va[3] = ((amps/10)%10);
        va[4] = ((amps/1)%10);
        va[5] = "A";
        lcd.setCursor(9, 0);
        
        lcd.print(va);
        wt = (volts * amps) * 10;
        
        //lcd.setCursor(15, 0);
        //lcd.print("+");
        lcd.setCursor(15, 0);
        //lcd.print("+" + (String(wt)) + "W");
        lcd.print(amps);
        //display_percent_watt(0, 17, wt, 'W');
      
      }
  //}
  
  void display_va( char col, char row, unsigned long value, char type){
  char va[] = "00.00 ";
//va[6] = '\0';
        va[0] = (value/1000);
        va[1] = ((value/100)%10);
        //va[2] = ".";
        va[3] = ((value/10)%10);
        va[4] = ((value/1)%10);
        va[5] = type;
        lcd.setCursor(col, row);
        //for(int x = 0; x < 7; x++){
        //lcd.setCursor(x, pos_row);
        //va = "123";
        lcd.print(va);
       //}
        
}

void display_percent_watt(char row, char col, unsigned int value, char type){
unsigned char percent[4];// = "000 ";
percent[4] = '\0';
        if (value < 100){
            percent[0] = ' ';
        }
        else{
            percent[0] = (value/100);
        }
        percent[1] = ((value/10)%10);
        percent[2] = ((value/1)%10);
                percent[3] = type;
        lcd.setCursor(col, row);
        for(int x = 0; x < 7; x++){
        lcd.setCursor(x, row);
        lcd.print(percent[x]);
        }
}



  void SpeedoIn(){

}