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Sep 2, 2025
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Trademark updates #2613

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16 changes: 8 additions & 8 deletions content/hardware/02.hero/boards/uno-r4-wifi/tutorials/touch/content.md
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---
title: UNO R4 Capacitive-Touch Tutorial.
title: UNO R4 Capacitive-Touch Tutorial
difficulty: beginner
description: Learn to use the built-in capacitive sensing capabilities of the Arduino® UNO R4.
tags: [Arduino, Capacitive Sensing, UNO R4]
Expand All @@ -12,14 +12,14 @@ software:
- web-editor
---

Capacitive sensing is a technology that detects changes in capacitance to determine the presence or absence of a conductive object, such as a human finger. This principle is widely used in touch-sensitive devices. The Arduino® UNO R4, both the [WiFi®](https://store.arduino.cc/products/arduino-uno-r4-wifi) and [Minima](https://store.arduino.cc/products/arduino-uno-r4-minima) versions, come equipped with built-in capacitive sensing capabilities, making it easier to integrate touch inputs into your projects.
Capacitive sensing is a technology that detects changes in capacitance to determine the presence or absence of a conductive object, such as a human finger. This principle is widely used in touch-sensitive devices. The Arduino® UNO R4, both the [WiFi](https://store.arduino.cc/products/arduino-uno-r4-wifi) and [Minima](https://store.arduino.cc/products/arduino-uno-r4-minima) versions, come equipped with built-in capacitive sensing capabilities, making it easier to integrate touch inputs into your projects.

![Sensor Example](assets/Touch_Cover_001.gif)

## Required Hardware
To use the library, you will need one of the compatible boards:
- [Arduino® UNO R4 WiFi](https://store.arduino.cc/products/uno-r4-wifi)
- [Arduino® UNO R4 Minima](https://store.arduino.cc/products/uno-r4-minima)
- [Arduino UNO R4 WiFi](https://store.arduino.cc/products/uno-r4-wifi)
- [Arduino UNO R4 Minima](https://store.arduino.cc/products/uno-r4-minima)

You will also need:
- Wire
Expand All @@ -41,9 +41,9 @@ The UNO R4 features a Capacitive Touch Sensing Unit (CTSU) that allows you to us

### Compatible Pins

For both the UNO R4 WiFi® and Minima boards, the compatible pins for capacitive touch are listed in the [Arduino_CapacitiveTouch library documentation](https://github.com/arduino-libraries/Arduino_CapacitiveTouch?tab=readme-ov-file#compatible-pins).
For both the UNO R4 WiFi and Minima boards, the compatible pins for capacitive touch are listed in the [Arduino_CapacitiveTouch library documentation](https://github.com/arduino-libraries/Arduino_CapacitiveTouch?tab=readme-ov-file#compatible-pins).

**Arduino® UNO-R4 Minima:**
**Arduino UNO R4 Minima:**

| Arduino Pin | Touch Sensor Channel (TS#) | Channel Control Index (CHAC idx) | Channel Control Bit Mask (CHAC val) |
|--------------|----------------------------|----------------------------------|-------------------------------------|
Expand All @@ -59,7 +59,7 @@ For both the UNO R4 WiFi® and Minima boards, the compatible pins for capacitive
| A2 (D16) | 22 | 2 | (1 << 6) |
| LOVE_BUTTON | 0 | 0 | (1 << 0) |

**Arduino® UNO-R4 WiFi®:**
**Arduino UNO R4 WiFi:**

| Arduino Pin | Touch Sensor Channel (TS#) | Channel Control Index (CHAC idx) | Channel Control Bit Mask (CHAC val) |
|--------------|----------------------------|----------------------------------|-------------------------------------|
Expand Down Expand Up @@ -147,4 +147,4 @@ Now that you have learned the basics, here are some fun and interesting project

## Conclusion

Capacitive sensing on the Arduino UNO R4 lets you add intuitive touch controls with minimal hardware. Simply pair the board with the `Arduino_CapacitiveTouch` library. Tune the detection threshold for your environment (such as humidity and nearby electronics), and you can quickly scale from a single-touch button to richer, multi-point interfaces.
Capacitive sensing on the Arduino UNO R4 lets you add intuitive touch controls with minimal hardware. Simply pair the board with the `Arduino_CapacitiveTouch` library. Tune the detection threshold for your environment (such as humidity and nearby electronics), and you can quickly scale from a single-touch button to richer, multi-point interfaces.