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Arduino power meter code


Arduino power meter code - SHUNT


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Download the .zip file below. Open it on your Arduino IDE and upload it to the Arduino and make sure you have the connections as in the schematic. Also, read all the comments in the code to understand more. You could also copy and paste the code fom below.
Download full code here (Shunt):



This code is for the schematic.





Remember to install the Adafruit_GFX library
Downlaod the Adafruit_GFX library here:



/*********************************************************************
Power meter example. Author: ELECTRONOOBS. 08/05/2018
Tutorial video: https://www.youtube.com/watch?v=_PKQdEUam6Y
Tutorial link: http://www.electronoobs.com/eng_arduino_tut28.php
*********************************************************************/


//Inport the libraries
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2


#if (SSD1306_LCDHEIGHT != 32)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif


//variables
float voltage = 0;
float current_voltage = 0;          //this maps the measured voltage in volts from 0 t 3.7V
float current =  0; 
float power=0;
float voltage_compenstion = 0;
float energy = 0;
unsigned long previousMillis = 0;
unsigned long loop_delay = 100;
unsigned long Time = 0;

void setup()   {                
  //Begin the display i2c omunication
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)  
}


//THIS FUNCTION WILL MAP THE float VALUES IN THE GIVEN RANGE
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;
}

//This functions will calculate the curret, voltage, power and energy values
void get_values()
{
  voltage = (fmap(analogRead(A1),0.0,1023.0,0.0,3.7)) / 0.218;
  
  voltage_compenstion = fmap(voltage,0.99,   14.01  ,0.02,   0.38) ;
  /*Ok, this vompensation is for the non linear voltage amplification.
   * This is what I've done. Ive measured the voltage at 0.99V input and 14.01V input.
   * At 1V input I had an error of 0.02 and at 14.01 of 0.38. I maap that value to that range
   * and add the linear compensation
  */
  
  voltage = voltage + voltage_compenstion;
  
  //This maps the measured voltage in volts from 0 t 3.7V
  current = (fabs(fmap(analogRead(A0), 0.0, 1023.0, 0.0, 3.7)))/1.21;
/* Pay atention. 
 *        - We read the value on A0 wich is ihe input from the amplifiers.
 *        - We map the digital values from range 0-1023 to range 0-3.7V since we are using 3.7V battery.
 *          this value won't change with the battery voltage since the analog read is related to the Vref
 *        - We divide by 121 (OpAmp gain) and then by 0.01 (shunt resistance). All in one, we divide
 *        bu 1.21 and that is the current value. HERE YOU SHOULD CHANGE THE 1.21 value in order to have
 *        same current values as on yur power supply.*/
 
  power = voltage*current;              //Calculate power and energy
  energy = energy + (power/3600)/1000;
}



void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= loop_delay)
  {
    previousMillis = currentMillis;
    get_values();
    Time = currentMillis / 1000;        //Get the elapsed time in seconds

    //Print all the values on the display
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(0,0);
    display.print(voltage);
    display.print("V");

    display.setCursor(60,0);
    display.print(current);
    display.print("A");

    display.setCursor(0,11);
    display.print(power);
    display.print("W");

    display.setCursor(60,11);
    display.print(energy);
    display.print("mWh");

    display.setCursor(100,22);
    display.print(Time);
    display.print("s");
        
    display.display();    //This functions will display the data
  }
}




Arduino power meter tutorial












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