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MPR121 Breakout I2C Capacitive Touch Sensor Controller Module

MPR121 Breakout I2C Capacitive Touch Sensor Controller Module for Arduino / Raspberry Pi

SKU: 382663
  • US$5.54

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MPR121 Breakout I2C Capacitive Touch Sensor Controller Module
MPR121 Breakout I2C Capacitive Touch Sensor Controller Module for Arduino / Raspberry Pi

MPR121 Breakout I2C Capacitive Touch Sensor Controller Module

US$4.99 US$5.54 10%OFF 5 (1 reviews)
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This is a breakout board for Freescales MPR121QR2. The MPR121 is a capacitive touch sensor controller driven by an I2C interface.

The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. The MPR121 also features eight LED driving pins.

When these pins are not configured as electrodes, they may be used to drive LEDs. There a four jumpers on the bottom of the board,

all of which are set (closed) by default. An address jumper ties the ADD pin to ground, meaning the default I2C address of the chip will be 0x5A.

If you need to change the address of the chip (by shorting ADD to a different pin), make sure you open the jumper first.

Jumpers also connect SDA, SCL and the interrupt pin to 10k pull-up resistors.

If you dont require the pull-up resistors you can open the jumpers by cutting the trace connecting them.

There is no regulation on the board, so the voltage supplied should be between 2.5 and 3.6VDC.

The VREG pin is connected through a 0.1uF capacitor to ground, which means, unless you modify the board,

you cant operate the MPR121 in low-supply voltage mode (DC 1.71~2.75V).

ModelMPR121 Breakout
Quantity1 piece
Form ColorBlack
ApplicationCapacitive Touch Sensor Controller
Working Voltage 2.5~3.6V
English Manual / SpecYes
Download Link
Dimensions & Weight
Dimensions 1.18 in x 0.79 in x 0.08 in (3 cm x 2 cm x 0.2 cm)
Weight 0.06 oz (1.6 g)
Packing List
1 x MPR121 capacitive touch sensor module

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Rate US$4.42 shipped US$4.41 shipped US$4.39 shipped

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Customer's impression:
worked as expected
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Recent Customer Reviews

  • pakeonoahu Post on 6/10/2015

    This device is very sensitive and worked correctly compare to building your own Capacitive sensor with Arduino, because the MPR121 do not require a grounding reference and doesn't drift(ie: when the capacitor charged up).... Read more

    Impression:worked as expected

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