Question

Start ARDUINO SOFTWARE and Write a program that checks the voltage value in the circuit of three resistors. i. If the voltage is higher than 4V, turn ON red LED ii. If the voltage is higher than 2V and less than 3V, turn ON yellow LED iii. If the voltage is less than 2V turn ON green LED. Note that analog input is used in this example.

Answer 1

arduino code:-

int voltagecheckpin = A0; // use the analog pin A0 to check the voltage
int RledPin = 2; // select the pin for the red LED
int GledPin = 3; // select the pin for the green LED
int YledPin = 4; // select the pin for the yellow LED
int voltagevalue = 0; // variable to store the value coming from the voltage check pin

void setup()
{
// declare the ledPin as an OUTPUT:
pinMode(RledPin, OUTPUT);
pinMode(GledPin, OUTPUT);
pinMode(YledPin, OUTPUT);

}

void loop()
{
// read the value from the sensor:
voltagevalue = analogRead(voltagecheckpin);
if(voltagevalue>4)
{
digitalWrite(RledPin, HIGH);
digitalWrite(YledPin, LOW);
digitalWrite(GledPin, LOW);
}
else if(voltagevalue<3 && voltagevalue>2)
{
digitalWrite(RledPin, LOW);
digitalWrite(YledPin, HIGH);
digitalWrite(GledPin, LOW);
}
else if (voltagevalue< 2)
{
digitalWrite(RledPin, LOW);
digitalWrite(YledPin, LOW);
digitalWrite(GledPin, HIGH);

}
delay(500);
}