Lesson 13 Button Switch

Share for us
Share on facebook
Share on twitter
Share on pinterest
Share on whatsapp


Most SunFounder boards already have an LED attached to pin 13 itself. So we will use a button module and this LED to build a simple circuit and make an LED brighten.


– 1 * SunFounder Uno board

– 1 * USB data cable

– 1 * Button module

–  Several jumper wires

Experimental Principle

With the LED attached to pin 13, connect the button module to digital pin 8. When the button module inducts button-pressing signals, the LED will be on. Otherwise, it will be off.

Experimental Procedures

Step 1: Build the circuit

                                    Button Module          SunFounder Uno

                                            S ————————————- Digital 8

                                            –  ————————————– GND

                                            + ————————————— 5V

Step 2: Program (Please refer to the example code in LEARN -> Get Tutorial on our website)

Step 3: Compile

Step 4: Upload the sketch to SunFounder Uno

Now, press the button and the LED attached to pin 13 on the SunFounder Uno board will light up.


const int ledPin = 13;//the number of the led pin
const int buttonPin = 8; //the button pin attach to
int val = 0;//variable to store the value read from button
void setup()
pinMode(ledPin,OUTPUT);//initialize the ledPin as an output
pinMode(buttonPin,INPUT);//initialize the buttonPin as an intput
void loop()
val = digitalRead(buttonPin);//read the value from button
if(val == HIGH)
digitalWrite(ledPin,LOW);//turn the led off
else //when pressed
digitalWrite(ledPin,HIGH);//turn the led on