C5 — Analogue inputs

Level 2 — Controlling the LED with an analogue input

Complete the challenge

int sensorPin = A5;            // the input pin for the potentiometer on the ThinkerShield
int sensorValue = 0;           // variable to store the value coming from the sensor

void setup() {
    pinMode(12, OUTPUT);   // declare the ledPin as an OUTPUT
    Serial.begin(9600);        // set the speed of the serial data connection
}

void loop() {
    sensorValue = analogRead(sensorPin);     // read the value from the sensor
    Serial.print("The sensor value is: ");   // send the words over the serial data connection
    Serial.println(sensorValue);             // send the sensor value over the serial data connection
    delay(100);                              // wait for 0.1 seconds so that we only send the sensor value back 10 times a second.
}

void setup() {
    pinMode(13, OUTPUT);    // set up pin 13 as an output.
}

void loop() {
    digitalWrite(13, HIGH); // turn the LED on
    delay(1000);            // wait for 1 second
    digitalWrite(13, LOW);  // turn the LED off
    delay(1000);            // wait for 1 second
}

The number in the brackets in the delay() function tells the Arduino how long to delay. But it doesn’t have to be a number – you can put a variable there too.

Change each delay(1000); to be delay(sensorValue);.

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