{"product_id":"adafruit-mpr121-12-key-capacitive-touch-sensor-gator-breakout-stemma-qt-qwiic","title":"Adafruit MPR121 12-Key Capacitive Touch Sensor Gator Breakout","description":"\u003cp\u003eAdd lots of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board, starring the MPR121.\u003c\/p\u003e\n\u003cp\u003eThis chip can handle up to 12 individual touchpads with plug-and-play STEMMA QT connector and large alligator\/croc-clip friendly pads, its a no-solder solution to capacitive touch sensing.\u003c\/p\u003e\n\u003cp\u003eThe MPR121 has support for reading data over I2C, which can be implemented with nearly any microcontroller. You can select one of 2 addresses with the ADDR pin (solder it close for the alternative address), for a total of 24 capacitive touch pads on one I2C 2-wire bus. Using this chip is a lot easier than doing the capacitive sensing with analog inputs: it handles all the filtering for you and can be configured for more\/less sensitivity.\u003c\/p\u003e\n\u003cp\u003eThis sensor comes as a tiny hard-to-solder chip so Adafruit put it onto a breakout board for you. Since it's a 3V-only chip, they added a 3V regulator and I2C level shifting so it's safe to use with any 3V or 5V microcontroller\/processor like Arduino. They even added an LED onto the IRQ line so it will blink when touches are detected, making debugging by sight a bit easier on you.\u003c\/p\u003e\n\u003cp\u003eComes with a fully assembled board. For contacts, we suggest using copper foil, metallic nylon, or pyralux, then connect up any \u003ca href=\"\/en-eu\/products\/crocodile-leads-set-of-10\" target=\"_blank\"\u003ealligator clip\u003c\/a\u003e from the conductive material to one of the big pads on the breakout.\u003c\/p\u003e\n\u003cp\u003eTo make using it as easy as possible, Adafruit have put the MPR121 on a breakout PCB in the \u003ca href=\"\/en-eu\/collections\/stemma-qt\" target=\"_blank\"\u003eStemma QT form factor\u003c\/a\u003e with a sprinkle of support circuitry to give you options when testing. You can either use a breadboard or the \u003ca href=\"\/en-eu\/collections\/qwiic\" target=\"_blank\"\u003eSparkFun qwiic\u003c\/a\u003e compatible \u003ca href=\"https:\/\/learn.adafruit.com\/introducing-adafruit-stemma-qt\" target=\"_blank\"\u003eSTEMMA QT\u003c\/a\u003e connectors, and compatibility with 5V voltage levels as commonly found on \u003ca href=\"\/en-eu\/collections\/arduino\" target=\"_blank\"\u003eArduinos\u003c\/a\u003e, as well as 3.3V logic used by many other boards like the Raspberry Pi or Feathers. \u003ca href=\"\/en-eu\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\"\u003eQT Cable is not included, but we have a variety in the shop\u003c\/a\u003e for quick plug-and-play support.\u003c\/p\u003e\n\u003cp\u003eGetting started is a breeze with the Arduino and CircuitPython\/Python libraries and tutorials. You'll be up and running in a few minutes, and if you are using another microcontroller, it's easy to port the code.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/adafruit-mpr121-12-key-capacitive-touch-sensor-breakout-tutorial\" target=\"_blank\"\u003eOf course, we wouldn't leave you with a datasheet and a \"good luck!\" - Adafruit wrote a detailed tutorial showing how to wire up the sensor, use it with an Arduino, and example code that gets the sensor logging data and detecting your touch!\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL DETAILS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eRevision History:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAs of November 2022\u003c\/strong\u003e - Adafruit have updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen - you may get the new PCB or the older version with vector fonts - both are identical other than the fancy silkscreen.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProduct Dimensions: 51.0mm x 25.2mm x 4.5mm \/ 2.0\" x 1.0\" x 0.2\"\u003c\/p\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":32348042920019,"sku":"ADA4830","price":7.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4830-06.jpg?v=1673012626","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-mpr121-12-key-capacitive-touch-sensor-gator-breakout-stemma-qt-qwiic","provider":"Pimoroni Ltd","version":"1.0","type":"link"}