MPR121 Touch Keyboard Capacitive Touch Keypad 12 Buttons Sensitive Keypad Overview A compact, sensitivity capacitive touch keypad based on the MPR121 touch controller. Provides 12 responsive touch inputs for replacing mechanical switches and adding modern touch control to electronics projects and products. Key benefits Reliable touch input: sensitivity detection gives a responsive, consistent user experience without physical buttons. Easy integration: Standard I2C interface simplifies connection to common microcontrollers and single board computers. Space saving: Twelve keys in a compact footprint let you add multiple inputs without bulky hardware. Flexible configuration: Sensitivity and detection behavior can be adjusted in software for different materials and user preferences. Durable and low maintenance: No moving parts means less wear over time and fewer mechanical failures. Main features 12 capacitive touch keys driven by the MPR121 controller. I2C communication for simple wiring and shared bus use. sensitivity detection suitable for direct touch or through thin nonconductive overlays. Compact PCB design for straightforward mounting in projects and enclosures. Adjustable detection settings via software for noise tolerance and touch threshold tuning. Compatibility Works with microcontrollers and development boards that support I2C, such as Arduino and Raspberry Pi. Compatible with a wide range of firmware and libraries that support MPR121 communication. Function and performance Converts touch events into digital inputs over I2C for easy reading in firmware. Fast response time for immediate control actions. Sensitivity tuning allows adaptation to different environmental conditions and overlay materials. Physical attributes Compact PCB with 12 touch pads arranged for keypad style input. Sturdy PCB construction suitable for integration into prototypes and finished products. Small footprint to fit into control panels, instrument fronts, and handheld devices. Practical applications Home automation control panel: mechanical switches with a sleek touch interface for lights, climate, and scenes. DIY musical or MIDI controller: Use the 12 touch keys for notes, triggers, or transport controls in compact electronic instruments. Industrial or kiosk input: Implement a lowprofile, easytoclean input surface for user interfaces in public or industrial environments. Why choose this module This MPR121 based keypad provides a straightforward path from concept to working touch interface. Its combination of 12 touch inputs, I2C connectivity, and adjustable sensitivity makes it suitable for hobbyist projects, prototypes, and production designs where reliable, lowprofile user input is required.