Arduino Battery Checker

This will show you how to setup your arduino to check to see how charged your battery is.

Step 1: The Setup

This is the basic setup of the battery checker.

List of Items Needed.

3 LED's prefer green, yellow, and red.

3 resistors 330 OHMS

6 breadboard wires

2 alligator clips

Arduino

Breadboard

Step 2: The Code

This is the basic code. If you have troubles with the led's lighting up then make sure you do not assign the led output number to a variable but a number. Example: pinMode(13,OUTPUT); --- digitalWrite(13,HIGH);. if you have a different battery then a 5V then change the 5.00 in the algorithm (voltage = analog * (5.00/1023)) to the max Voltage on your battery.

THE CODE:

int analog = 0; // To read the value of the battery.
float voltage = 0; // To take analog and turn it into Voltage

int ledDelay = 1000;

void setup() { // put your setup code here, to run once:

pinMode(13,OUTPUT); //Green led

pinMode(3,OUTPUT); //Yellow led

pinMode(2,OUTPUT); //Red led

pinMode(0,INPUT); //Battery input

Serial.begin(9600);

}

void loop() { // put your main code here, to run repeatedly:

analog = analogRead(0);

voltage = analog * (5.00/1023); // Algorithm for the code to be the right voltage.

Serial.println(voltage);

if(voltage>=1.6)

{

digitalWrite(13,HIGH);

}

else if(voltage >1.2 && voltage <1.6)

{

digitalWrite(3,HIGH);

}

else if(voltage<=1.2)

{

digitalWrite(2,HIGH);

}

digitalWrite(13,LOW);

digitalWrite(3,LOW);

digitalWrite(2,LOW);

}