ESP32 - Touch Sensor Toggle LED
This tutorial instructs you how to use ESP32 to toggle the state of an LED between ON and OFF when a touch sensor is touched. More specifically:
- If the touch sensor is touched, turn the LED on
- If the touch sensor is touched again, turn the LED off
- The above process is repeated over and over again
Hardware Used In This Tutorial
|1||×||ESP-WROOM-32 Dev Module|
|1||×||Micro USB Cable|
|1||×||220 ohm resistor|
|1||×||(Optional) 5V Power Adapter|
|1||×||(Optional) DC Power Jack|
|1||×||(Optional) ESP32 Screw Terminal Adapter|
One of the following breadboard:
|1||×||Full-sized 830-Point Breadboard|
|1||×||Half-sized 400-point Breadboard|
|1||×||Mini-sized 170-point Breadboard|
|1||×||All-sized Breadboard Kit|
Introduction to LED and Touch Sensor
We have specific tutorials about LED and touch sensor. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:
This image is created using Fritzing. Click to enlarge image
ESP32 Code - Touch Sensor Toggles LED
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Keep touching the touch sensor several seconds and then release it.
- See the change of LED's state
Line-by-line Code Explanation
The above ESP32 code contains line-by-line explanation. Please read the comments in the code!
In the code, ledState = !ledState is equivalent to the following code:
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