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Copy file name to clipboardExpand all lines: content/hardware/02.hero/boards/uno-r4-wifi/tutorials/touch/content.md
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title: UNO R4 Capacitive-Touch Tutorial.
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title: UNO R4 Capacitive-Touch Tutorial
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difficulty: beginner
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description: Learn to use the built-in capacitive sensing capabilities of the Arduino® UNO R4.
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tags: [Arduino, Capacitive Sensing, UNO R4]
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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.
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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.
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## Required Hardware
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To use the library, you will need one of the compatible boards:
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-[Arduino® UNO R4 WiFi](https://store.arduino.cc/products/uno-r4-wifi)
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-[Arduino® UNO R4 Minima](https://store.arduino.cc/products/uno-r4-minima)
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-[Arduino UNO R4 WiFi](https://store.arduino.cc/products/uno-r4-wifi)
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-[Arduino UNO R4 Minima](https://store.arduino.cc/products/uno-r4-minima)
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You will also need:
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- Wire
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### Compatible Pins
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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).
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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).
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**Arduino® UNO-R4 Minima:**
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**Arduino UNOR4 Minima:**
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| Arduino Pin | Touch Sensor Channel (TS#) | Channel Control Index (CHAC idx) | Channel Control Bit Mask (CHAC val) |
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## Conclusion
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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.
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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.
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