Arduino and basic electronics

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Open a new Arduino window with a blank sketch in it.

Save your Arduino sketch. Name it C5-level3.

Copy this sketch

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(8, OUTPUT);        // declare pin 8 as an OUTPUT
    pinMode(9, OUTPUT);        // declare pin 9 as an OUTPUT
    pinMode(10, OUTPUT);       // declare pin 10 as an OUTPUT
    pinMode(11, OUTPUT);       // declare pin 11 as an OUTPUT
    pinMode(12, OUTPUT);       // declare pin 12 as an OUTPUT
}

void loop() {
    sensorValue = analogRead(sensorPin);     // read the value from the sensor
}

Here is some pseudocode that tells you how the LEDs should be turned on and off. You’ll need to change this to Arduino code and put it in the loop() function.

Turn off all the LEDs.
If the value from the potentiometer is between 0 and 204, turn LED 8 on.
If the value from the potentiometer is between 205 and 410, turn LED 9 on.
If the value from the potentiometer is between 411 and 615, turn LED 10 on.
If the value from the potentiometer is between 616 and 820, turn LED 11 on.
If the value from the potentiometer is between 821 and 1023, turn LED 12 on.

Here is some code to turn LED 10 on if the value from the potentiometer is between 300 and 400.

    if (sensorValue >= 300 && sensorValue <= 400) {  // if the value from the potentiometer is between 300 and 400.
        digitalWrite(10, HIGH);                       // turn LED 10 on
    }

How would you turn all of the LEDs off? digitalWrite(8, LOW); turns off LED 8.

Pseudocode “If the value from the potentiometer is between 0 and 204, turn LED 8 on.” needs three lines of actual code:

    if (sensorValue >= 0 && sensorValue <= 204) {  // if the value from the potentiometer is between 0 and 204.
        digitalWrite(8, HIGH);                      // turn LED 8 on
    }

Remember, you need to get the LEDs to come on when the potentiometer reaches a certain value. The values are listed above.

Put the code inside the loop() function.

C5 — Analogue inputs

Level 3 — Turn LEDs on and off with the potentiometer

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