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Two-color LED flashing experiment

Product name:Bicolor LED

Product introduction:Two-color light-emitting diode (LED) can emit two different colors of light, usually red and green, rather than the only one color.

 

Product Image:

Bicolor LED

 

 

Experimental introduction:Connect the Bicolor LED sensor module to the GPIO pin of the Raspberry Pi through the female-to-female DuPont cable, and make the Bicolor LED sensor emit red and green light alternately through programming.

 

Sensor schematic diagram:

 

 

Components required for the experiment:

Raspberry Pi Board *1

Raspberry Pi Power Adapter*1

Bicolor LED sensor module*1

female-to-female DuPont cables

 

Bicolor LED Sensor Module

Raspberry Pi GPIO (BOARD)

Function Name

Raspberry Pi GPIO ( wiring)

S1

36

GPIO.27

27

S2

38

GPIO.28

28

GND

34

GND

 

Circuit connection:

 

Program running result:the traffic lights of the Bicolor LED sensor flash

Python code:

"""

import RPi.GPIO as GPIO

import time

 

# Remove warning message

GPIO.setwarnings(False)

# Set the pin mode to BOARD mode

GPIO.setmode(GPIO.BOARD)

# Two pins of bi-color LED connected to 34

pins = [36, 38]

# Delay time, the smaller the value, the faster the LED color switching, and vice versa

sleep_time = 0.1

 #Pin initialization

for i in pins:

    #Pin initialization

    # GPIO.setup(pins, GPIO.OUT)

    # 36 38 Pin is low voltage

 

    # GPIO.setup(pins, GPIO.LOW)

    GPIO.setup(i, GPIO.OUT, initial=GPIO.LOW)

 

while True:

     # 36 Pin is high level, the light is on

    GPIO.output(pins[0], GPIO.HIGH)

# Print prompt information, (can be not needed)

 

    print('Red on')

   # Delay

    time.sleep(sleep_time)

 

    # 36 Pin is low level, the light is off

 

    GPIO.output(pins[0], GPIO.LOW)

    print('Red off')

    time.sleep(sleep_time)

 

 # 38 The pin is high level and the light is on

 

    GPIO.output(pins[1], GPIO.HIGH)

    print('Green on')

    time.sleep(sleep_time)

 

     # 38 Pin is low level, the light is off

    GPIO.output(pins[1], GPIO.LOW)

    print('Green off')

    time.sleep(sleep_time)

"""

 

C language code:

"""

#include <wiringPi.h>

#include <stdio.h>

#define LED_R 27 //Macro definition interface

#define LED_G 28

int main (void)

{

  wiringPiSetup () ; //Initialize GPIO

  pinMode (24, OUTPUT) ; //output mode

 

  pinMode (25, OUTPUT) ; //output mode

  for (;;)

  {

    digitalWrite (LED_R, HIGH) ; delay (500) ;     

    digitalWrite (LED_R,  LOW) ; delay (500) ;

    digitalWrite (LED_G, HIGH) ; delay (500) ;  

    digitalWrite (LED_G,  LOW) ; delay (500) ;

  }

  return 0 ;

}

"""

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