Grove - I2C Touch Sensor

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The I2C Touch Sensor is based on FreeScale MPR121, it feels the touch or proximity of human being fingers. This sensor include 2 parts: one Touch Sensor controller, and 4 finger feelers. Insert the connectors of feelers into base of Sensor controller, and you can begin your touch controlling. Specifications

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Operating Voltage: 3 - 5.5V Standby Mode Current: 2μA Touch Pads: 12 Pads Communicating Protocol: I2C I2C Address: 0x5A - 0x5D Pin Description


The INT pin has to be led out by customers themselves if customers want to use the interrupt pin of MPR121. The CH4~CH11 are for customer expanding the function, there are 4 feelers within the pack. If you needs more, you can make the feelers by yourself or buy them in the The wires of feelers are twisted to reduce the impact of environment. The black(ground) wire can be cut off if high sensitivity is needed. Usage

NOTE: Because each electrode needs to be auto-configured by the MPR121 when power up and there is no power reset on the touch sensor controller, Every time you insert or extract a feeler you need to reset the power of The feelers can also feel the human being fingers with something between, that's to say, you do not need to touch the feelers with your fingers indeed.

With a paperboard about 3 mm thick, the feeler can feel the touch of fingers, makes it a good solution for many applications.

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File:Grove - I2C Color sensor v1.2.pdf