LDR

Description

An LDR is a light-dependent resistor. It changes it's resistance depending on the light falling onto the LDR.

How to connect it electrically

Connecting the light dependent resistor (LDR). The value you read is dependent on how bright it is.

How to control it in MicroPython

This makes Pin 34 an analog input and set it to 12 bit. It reads the analog value every second and print it to the console.

#Example usage for ESP32
from machine import Pin, ADC
from time import sleep

analogPin = ADC(Pin(34))
analogPin.atten(ADC.ATTN_11DB)

while True:
  analogVal = analogPin.read()
  print(analogVal)
  sleep(1)

Code Example Arduino Nano Connect RP2040

A0 is the analog input with 16 bit resolution. It reads the analog value every second and print it to the console-

#Example usage for Arduino Nano
from machine import Pin, ADC
from time import sleep

analogPin = ADC(Pin(26))

while True:
  analogVal16 = analogPin.read_u16()
  print(analogVal16)
  sleep(1)