【ESP32 Learning】Touch Button

dcexpert

【ESP32 Learning】Touch Button [Copy link]

 

ESP32 supports capacitive touch button function. Its main features are: Main Features

• Supports up to 10 capacitive touch pins/General Purpose Input and Output (GPIO)
• Touch pins can be used in combination to cover a larger touch area or more touch points
• Touch pin sensing is controlled by finite state machine (FSM) hardware, initiated by software or dedicated hardware timer
• Information on whether the touch pin is touched can be obtained in the following ways:
  • Software directly checks the register of the touch sensor
  • Judgment by the interrupt signal initiated by the touch monitoring module
  • Judgment by whether the CPU on the touch monitoring module wakes up from Deep-sleep
• Supports low-power operation in the following scenarios:
  • The CPU is in Deep-sleep energy-saving mode and will gradually wake up after being touched
  • Touch monitoring is managed by the ultra-low power coprocessor (ULP coprocessor)

Touch button pins

Touch sensor signal name	Pin
T0	GPIO4
T1	GPIO0
T2	GPIO2
T3	GPIO15
T4	GPIO13
T5	GPIO12
T6	GPIO14
: T7	GPIO27
T8	GPIO33
T9	GPIO32

Usage of touch buttons

1. from machine import Pin, TouchPad from time import sleep_ms tc7 = TouchPad(Pin(27)) while True: sleep_ms(500) print(tc7.read())

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First, you need to define a touch button and specify the pin. Then you can read the status of the button. The return value is an integer. The value is related to the button layout, parameter settings, and button sensing. The change in the value can be used to determine whether there is a touch action, such as: It can be clearly seen from the above data that the value becomes significantly smaller when there is touch. This content is originally created by EEWORLD forum user dcexpert. If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

sacq

Personally tested, using 0 pin, 700-900

okhxyyo

#Learn ESP32's micropython with me#Related learning materials https://en.eeworld.com/bbs/forum ... 2426&fromuid=536508 (Source: Electronic Engineering World-Forum)