1.Product Introduction
The traffic light module integrates three different color LEDs: red, yellow, and green. It has four pins, one of which is a common pin, and the other three pins control the operation of three different color LEDs. The common GND is connected to the GND port of the development board, and the R, Y, and G pins are connected to different I/O ports of the development board. When each R, Y, and G pin inputs a high level, the corresponding color LED will light up.
Application reference: Traffic lights, indicators, etc.
2.Parameter Specification
| Parameter | Value//Description |
|---|---|
| Operating voltage | 3.3V~5V |
| Operating temperature | -40°C~+70°C |
| Output signal | Digital signal |
| Size | 4.8cm*2.4cm |
3.Wiring Diagram
Hint
Expansion board is attached to esp32 controller board.
| Traffic Light Module | UNO |
|---|---|
| G | 0 |
| Y | 2 |
| R | 14 |
| GND | GND |
4.Sample Code
1#define R 14 //Define the pin for the red light of the traffic light
2#define Y 2 //Define the pin for the yellow light of the traffic light
3#define G 0 //Define the pin for the green light of the traffic light
4
5void setup() {
6 pinMode(R, OUTPUT); //Set the red light pin to output mode
7 pinMode(Y, OUTPUT); //Set the yellow light pin to output mode
8 pinMode(G, OUTPUT); //Set the green light pin to output mode
9}
10
11void loop() {
12 Traffic_Light(0, 0, 1); //Green light on
13 delay(2000); //Delay 2 seconds
14 Traffic_Light(0, 1, 0); //Yellow light on
15 delay(1000); //Delay 1 seconds
16 Traffic_Light(1, 0, 0); //Red light on
17 delay(3000); //Delay 3 seconds
18}
19//Define traffic light color control function
20
21void Traffic_Light(int r, int y, int g) {
22 digitalWrite(R, r);
23 digitalWrite(Y, y);
24 digitalWrite(G, g);
25}
5.Test Result
When you have successfully connected the circuits according to the wiring diagram and successfully uploaded the correct program, your traffic light will be green for 2 seconds, yellow for 1 second, and red for 3 seconds.
6.Related Resources
