MPR121 12Key Capacitive Touch Sensor Module Key benefits — why you need it Adds 12 sensitive capacitive touch inputs for precise, fast touch detection with 3.3V logic output. Ideal when you need responsive, reliable user input without mechanical switches. Built for durability and frequent use: PCB materials and a rightangle pin header provide stable performance, easy boardlevel installation, and longterm reliability. Simplifies system design and integration: direct compatibility with 3.3V microcontrollers and easy expansion to other logic levels using standard level shifters. What it does and how it stands out Function: Provides 12 independent touch keys that deliver rapid touch response and consistent performance in repeated use scenarios. Material and construction: Constructed from PCB materials and fitted with a rightangle pin header for straightforward mounting and wiring. Performance: Stable, repeatable touch sensing with a 3.3V logical output that matches modern embedded controllers without additional voltage translation. Compatibility and integration Native compatibility with 3.3V microcontrollers; can be used with other voltage systems by adding logical level converters. Designed for easy installation on development boards or into custom PCBs thanks to the rightangle pin header and standard board footprint. Practical applications Robotics: Use as a compact control keypad for robot panels, enabling multiple tactile inputs for mode selection, manual overrides, or operator controls. Automation and embedded systems: Implement as a user keypad for smart controllers, kiosks, or appliance interfaces where sealed, contactless inputs are preferred. Prototyping and education: Integrate into classroom or lab projects to teach touch sensing, human–machine interfaces, or rapid prototyping of interactive devices. Who it's for Developers, engineers, and electronics enthusiasts who need a reliable, easytointegrate capacitive input module for projects, devices, or educational setups. Included and recommended Module with 12 touch interfaces, PCB, and rightangle pin header. For non3.3V systems, use a logic level converter to adapt the module safely. Specifications (as provided) Sensor chipset: MPR121 capacitive touch sensor Inputs: 12 touch keys Output logic: 3.3V This module provides a durable, compact, and developerfriendly way to add accurate capacitive touch input to robotics, automation, and embedded systems projects.