Tutorial Analog IN
Analog Input with MicroPyton and ESP32/ESP8266
In this part of the tutorial, we demonstrate how to read in an analog value using MicroPyton on ESP32/ESP8266. We also show how we can use the analog input to measure a changing resistor. This includes looking at the voltage range that can be measured the resolution of the analog-digital converter (ADC).
- you can read in an analog value from the python prompt
- you understand how to build a voltage divider to read a sensor value from a changing resistor
- you can connect a Potentiometer, a slider, and a LDR to the ESP32/ESP8266 and read the value
The videos are a first test... the ones marked with ** will be replaced over the next months with new versions.
Analog Input - ADC - connecting a variable resistor **
In this video on youtube (46:23) we show how to connect to read in an analog value with MicroPython. We also show how a sensor that is based on a changing resistance can be connected using a voltage divider: https://youtu.be/gjj5KyK2qGI
Schematics and Code Example
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-
1 #Example usage 2 from machine import Pin, ADC 3 from time import sleep 4 5 analogPin = ADC(Pin(34)) 6 analogPin.atten(ADC.ATTN_11DB) 7 8 while True: 9 analogVal = analogPin.read() 10 print(analogVal) 11 sleep(1)