ESP32 - Touch Sensor - LED
This tutorial instructs you how to use ESP32 to control LED based on the state of the touch sensor. In detail:
- If a touch sensor is being touched, ESP32 turns LED on
- If a touch sensor is NOT being touched, ESP32 turns LED off
We also have another tutorial: ESP32 - Touch Sensor Toggles LED, which toggle LED state between ON and OFF when the touch sensor is touched.
Hardware Used In This Tutorial
1 | × | ESP-WROOM-32 Dev Module | |
1 | × | USB Cable Type-C | |
1 | × | Touch Sensor | |
1 | × | LED | |
1 | × | 220 ohm resistor | |
1 | × | Breadboard | |
1 | × | Jumper Wires | |
1 | × | (Optional) DC Power Jack | |
1 | × | (Recommended) Screw Terminal Expansion Board for ESP32 |
Or you can buy the following sensor kits:
1 | × | DIYables Sensor Kit (30 sensors/displays) | |
1 | × | DIYables Sensor Kit (18 sensors/displays) |
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:
Wiring Diagram
The wiring diagram with power supply from USB cable
This image is created using Fritzing. Click to enlarge image
The wiring diagram with power supply from 5v adapter
This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
ESP32 Code
Quick Instructions
- 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
- Touch and keep touching the touch sensor several seconds
- 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!
Video Tutorial
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