Arduino and basic electronics

Complete the challenge

Start a new Arduino sketch and put this code into it:

void setup() {
    pinMode(13, OUTPUT);
}

void loop() {
    if (analogRead(A5) > 100) {
        digitalWrite(13, HIGH);
    } else {
        digitalWrite(13, LOW);
}

Upload it to your Arduino.

We connect the LDR using a circuit called a “voltage divider”. It divides the 5V from the Ardiuno between the LDR and a resistor.

Without that resistor, we wouldn’t be able to use the LDR.

This is how you actually connect the wires. Be sure to use the resistor with the right colours on it!

Cover the LDR so that light can’t reach it. Then uncover it.

Dit the LED go on and off?

Claim your achievement

I did it!

That’s fantastic!

Now claim your achievement.

Complete a claim slip. Use code E4 and level 1.

Activity E4 — Wiring an LDR

Level 1 — Connect an LDR to the Arduino

Complete the challenge

Claim your achievement