Create a Dimmable LED with a Potentiometer on the Raspberry Pi

In this video lesson, we show how to create a dimmable LED on the raspberry pi using a potentiometer. Below is the schematic of the circuit we will be using.

Then we used the following code to read values through the ADC0834 analog to digital chip, and then apply a PWM signal to control the brightness of the LED.

import RPi.GPIO as GPIO
import ADC0834
import time

GPIO.setmode(GPIO.BCM)

LEDPin=23
GPIO.setup(LEDPin,GPIO.OUT)
myPWM=GPIO.PWM(LEDPin,1000)
myPWM.start(0)
ADC0834.setup()
try:
    while True:
        analogVal=ADC0834.getResult(0)
        print('Raw= ',analogVal, 'Vol= ', analogVal/255*5)
        DC=analogVal*100/255
        myPWM.ChangeDutyCycle(DC)
        time.sleep(.2)
        
except KeyboardInterrupt:
    GPIO.cleanup()
    print('GPIO Good to Go')

import RPi.GPIO as GPIO

import ADC0834

import time

GPIO.setmode(GPIO.BCM)

LEDPin=23

GPIO.setup(LEDPin,GPIO.OUT)

myPWM=GPIO.PWM(LEDPin,1000)

myPWM.start(0)

ADC0834.setup()

try:

while True:

analogVal=ADC0834.getResult(0)

print('Raw= ',analogVal, 'Vol= ', analogVal/255*5)

DC=analogVal*100/255

myPWM.ChangeDutyCycle(DC)

time.sleep(.2)

except KeyboardInterrupt:

GPIO.cleanup()

print('GPIO Good to Go')

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