User manual

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Chapter6 Traffic light

Experiment component:

 Red , Green , Yellow led lamp: 3

 220Ω resistor: 3

 Breadboard & Jumper wires

Connect your circuit as the below diagram.

Example code:

Program code is in the traffic lights program folder. Double-click to open and you will find out a

trafficLed.pde file. Double-click the icon to open it. Then you will see that it is the arduino

programming software window with the experimental program code.

int ledred=10; //define digital pin10 red

int ledyellow=7; //define digital pin7 yellow

int ledgreen=4; //define digital pin4 green

void setup()

{

pinMode(ledred,OUTPUT);//set red pin output

pinMode(ledyellow,OUTPUT);// set yellow pin output

pinMode(ledgreen,OUTPUT);// set green pin output

}

void loop()

{

digitalWrite(ledred,HIGH);//light up red lamp

delay(1000);//delay 1000 ms = 1 s

digitalWrite(ledred,LOW);//go out red lamp