MPR121 Touch Sensor Module MPR121 Breakout V12 Capacitive Touch Sensor Controller Module I2C keyboard – Intuitive, Versatile, and Convenient

MPR121 Touch Sensor Module-

The MPR121 Capacitive Touch Sensor Module is an electronic component designed to detect touch or proximity of conductive objects. It’s widely used in electronic projects for creating touch-sensitive interfaces and controls. The module includes LED indicators to provide visual feedback when a touch is detected.

The MPR121 Touch Sensor Module is a capacitive touch sensor controller driven by an I2C interface. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. This is a breakout board for NXP/ Freescale’s MPR121QR2. The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs.

There a four jumpers on the bottom of the board, all of which are set (closed) by default. An address jumper ties the ADD pin to the ground, meaning the default I2C address of the chip will be 0x5A. If you need to change the address of the chip (by shorting ADD to a different pin), make sure you open the jumper first. Jumpers also connect SDA, SCL and the interrupt pin to 10k pull-up resistors. If you don’t require the pull-up resistors you can open the jumpers by cutting the trace connecting them.

There is no regulation on the board, so the voltage supplied should be between 2.5 and 3.6 VDC. The VREG pin is connected through a 0.1uF capacitor to the ground, which means, unless you modify the board, you can’t operate the MPR121 in low-supply voltage mode (1.71-2.75VDC).

The MPR121 module employs capacitive sensing technology to detect changes in capacitance when a conductive object, like a finger, comes into close proximity to the touchpad. It provides a digital output signal indicating touch detection. When touched, the corresponding channel’s output goes HIGH; otherwise, it remains LOW.

The module typically operates on a low voltage supply, usually around 2.5V DC to 3.6V DC, making it compatible with a wide range of microcontrollers and digital systems. The module is compact and easy to integrate into various electronic projects, and it often comes on a small PCB (Printed Circuit Board).

The module communicates with a microcontroller or digital system using the I2C (Inter-Integrated Circuit) protocol, allowing for easy integration into digital projects. MPR121 Capacitive Touch Sensor Modules are commonly used in projects that require touch-sensitive interfaces, such as touch-controlled switches, interactive displays, and proximity sensors.

Specifications

• Operating Voltage: 2.5 to 3.6V DC
• Colour: Black
• Interface Type: I2C
• Number of Electrodes: 12 Electrodes

Features

Intuitive Touch Sensing-

This Capacitive Touch Sensor Module redefines user interaction. With its advanced capacitive sensing technology, it allows for intuitive and effortless touch control. Whether you’re designing a touch-sensitive interface or an interactive installation, this module brings a new level of engagement to your projects.

Multi-Channel Capacitive Sensing-

Equipped with multiple touch channels, this Capacitive Touch Sensor Module provides extensive capabilities for detecting various touch gestures. This enables it to excel in applications such as proximity sensing, button replacements, and more.

User-Friendly Integration-

Featuring clearly labelled pins and straightforward documentation, this Capacitive Touch Sensor Module is designed for easy integration. Whether you’re an experienced developer or just starting out, you’ll appreciate the simplicity and efficiency it brings to your touch-sensitive applications.

Useful Links

MPR121 Capacitive Touch Sensor Music Organ

Package Included

1 x MPR121 Touch Sensor Module MPR121 Breakout V12 Capacitive Touch Sensor Controller Module I2C keyboard