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Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121

SKU: ADA1982

$13.50 AUD, inc GST
$12.27 AUD, exc GST

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Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121
13.5 AUD

SKU: ADA1982

$13.50 AUD, inc GST
$12.27 AUD, exc GST
In stock, with a short lead time. 144 units dispatch in 4 to 7 days (in addition to the shipping method you choose). Our timing and stock is accurate. Delivery to you by Wed, 30th of Aug with Express Post within Australia.
Shipping Offer

Add lots of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board, starring the MPR121. This chip can handle up to 12 individual touch pads.

The MPR121 has support for only I2C, which can be implemented with nearly any microcontroller. You can select one of 4 addresses with the ADDR pin, for a total of 48 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.

This sensor comes as a tiny hard-to-solder chip so they put it onto a breakout board for you. Since it's a 3V-only chip, Adafruit added a 3V regulator and I2C level shifting so its safe to use with any 3V or 5V microcontroller/processor like Arduino. Adafruit 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. Comes with a fully assembled board, and a stick of 0.1" header so you can plug it into a breadboard. For contacts, we suggest using copper foil or pyralux, then solder a wire that connects from the foil pad to the breakout.

Getting started is a breeze with Adafruit's Arduino library and tutorial. You'll be up and running in a few minutes, and if you are using another microcontroller, its easy to port Adafruit's code.

Of course, Adafruit 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!


Technical Details

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Documentation and Resources:
  • IoT Plant Monitor
  • So, my wife wanted to have some small plants in the house. I didn’t, so we compromised, and got some plants. The only thing is that neither of us remembers to water them, so I wanted to build a sensor array to monitor the moisture content of the soil, and notify us when they needed watering. We’ve got 3 plants, all fairly close to each other, and I wanted to create an IoT project so that it could send an email notifi...

Product Comments

We deliver Australia-wide with these options:

  • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.32 for Express Post (1-2 days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address:

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

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