Chapter 8 AD Converter

In this chapter, we will learn how to use ESP32-S3 to read analog signals.

Project 8.1 Read the Voltage of Potentiometer

In this project, we will use the ADC function of ESP32-S3 to read the voltage value of the potentiometer and print it out through the serial monitor.

Component List

ESP32-S3-WROOM x1
GPIO Extension Board x1
830 Tie-Points Breadboard x1
Potentiometer(10k) x1
Jumper Wire x3

Component knowledge

Potentiometer 

Connect

Code

Move the program folder Super_Starter_Kit_for_ESP32_S3/Python/Python_Codes to disk(D) in advance with the path of “D:/Micropython_Codes”.

Open “Thonny”, click This computer/D:/Micropython_Codes/08.1_Analog Read and then click “AnalogRead.py”.

08.1_AnalogRead

Click “Run current script” and observe the message printed in “Shell”.

The following is the program code:

from machine import ADC,Pin
import time

adc=ADC(Pin(1))
adc.atten(ADC.ATTN_11DB)
adc.width(ADC.WIDTH_12BIT)

try:
    while True:
        adcVal=adc.read()
        voltage = adcVal / 4095.0 * 3.3
        print("ADC Val:",adcVal,"Voltage:",voltage,"V")
        time.sleep_ms(100)
except:
    pass