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Grove - 12 Key Capacitive I2C Touch Sensor V2 (MPR121), Proximity Sensor, Capacitance Sensor
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The Grove - 12 Key Capacitive I2C Touch Sensor V2 (MPR121) is a multichannel proximity capacitive touch sensor. It's a 3-in-1 module with the following features: Capacitance Sensing, Touch Sensing, and Proximity Sensing.
Capacitance Sensing: This module uses a constant DC current capacitance sensing scheme. It can measure capacitances ranging from 10 pF to over 2000 pF with a resolution up to 0.01 pF.
Touch Sensing: Once the electrode capacitance data is acquired, the electrode touch/release status is determined comparing it to the capacitance baseline value.
Proximity Sensing: One new feature of the MPR121 is the near proximity sensing system. This means that all of the system’s electrodes can be summed together to create a single large electrode.
Based on Freescale MPR121, this sensor have 12 completely independent electrodes with build-in autoconfiguration. Thanks to I2C interface, you can detect all the 12 electrodes signals with only one Grove port, and the I2C address is hardware configurable, from 0X5B to 0X5D. This also makes it possible for multiple Grove - 12 Key Capacitive I2C Touch Sensor V2 (MPR121) to be used together for channel expansions in a single system, you can build a touch system which contains max. 36 electrodes.
This sensor is an upgrade version of Grove - I2C Touch Sensor, to meet Matsuzawa.Takashi's(one of our customer) needs, we make the I2C address changeable, and even cheaper than the old version. So if you have any suggestions about all the Groves, please just shoot to us. We will always listen to your voice, it may make another upgrade, even a new grove. Please kindly write your suggestions in the Grove 100+ page.
We've Released the Grove Selection Guide and hope to help you find the Grove suit you best.
Internal 10-bit ADC
Integrated independent autocalibration for each electrode input
Completely independent electrodes with built-in autoconfiguration
I2C interface, with IRQ Interrupt output to advise electrode status changes
Hardware configurable I2C address
12 electrodes/capacitance sensing inputs in which 8 are multifunctional for LED driving and GPIO
Autoconfiguration of charge current and charge time for each electrode input
Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence
How to play a scratch game with a Touch Sensor?
We made a piano using a touch sensor, as well as leaves for piano keys.
This is the wiki page for this product, which will show you how to use the product, as well as details about the software and hardware.