Hi.. I'm trying to measure the internal resistance of my lithium-ion battery, my problem is how to stop the measurement when the Arduino reads voltage at no load, and when I turned the switch connected with 10ohm,5W resistor which I will use as my load to get the Vload, so that
Rint = R( Vnoload - Vload ) / Vload
so far this is my code. Thank you for your help guys. <3
#include "Wire.h"
#include "LCD.h"
#include "LiquidCrystal_I2C.h"
#define I2C_ADDR 0x3F // Add your address here.
#define Rs_pin 0
#define Rw_pin 1
#define En_pin 2
#define BACKLIGHT_PIN 3
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
void setup()
{
lcd.begin (20,4); // our LCD is a 20x4, change for your LCD if needed
// LCD Backlight ON
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home (); // go home on LCD
lcd.print(" GENERATOR RATING");
}
void loop()
{
printVolts();
}
void printVolts()
{
int sensorValue = analogRead(A0);
float voltage1 = sensorValue * (5.00 / 1023);
lcd.setCursor (0,1); // go to start of 2nd line
lcd.print(voltage1);
lcd.print(" V");
}
If you want to do something once in loop() then set a boolean variable to true when you first do it and make doing it dependant on the variable being false
if (theReadingHasBeenTaken == false)
{
the readingHasBeenTaken = true;
//take the reading
}
Hi this is the schematic I'm using (attached) but the I'm getting the same result, what I want to get is the recorded value of voltage at no load, after I press the switch the reading at A0 will stop and then reading at A1 is the Vload rating of the battery. After that, I can proceed with internal resistance calculations... thank you
