SparkFun will be closed Nov 26th and 27th for the Thanksgiving holiday. Orders placed after 2:00pm MT on the 25th will ship out Monday the 30th.

Retired Product

This product has been retired from our catalog and is no longer for sale. This page is made available for those looking for datasheets and the simply curious.

Creative Commons images are CC BY-NC-SA 3.0

Description: The MPR121 IC is a great way to build simple capacitive touch interfaces, and now it’s even easier to incorporate into your Arduino projects with the touch shield. The touch shield has 9 capacitive touch pads, with headers for the remaining 3 electrode connections. With this shield you can have a total of 12 touch sensitive buttons. An on-board logic level converter allows it to work with 5V and 3.3V Arduino boards. Simply solder on some header pins and stack it on to your Arduino for a convenient input device. Check below for some example code to get you started.

These come in fancy clamshell packaging meant for our distributors that need it. Regular customers are welcome to order, but we want to limit the amount of extra packaging finding its way into the trash heap. The version without the extra plastic can be found in the related items below.


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Customer Comments

  • What is the magic by which one of the red leds is glowing yellow?

  • What is the purpose of the BSS138s on the SCL and SDA lines?

    • Those are logic-level translators. It’s a super-simple way to do bidirectional level translation on an open-drain line. I can’t find the nice appnote that TI (I think) had on the technique, but here’s an article from Maxim.

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