The Grove - 12 Key Capacitive I2C Touch Sensor V3 (MPR121) is a multi-channel proximity capacitive touch sensor. It's a 3-in-1 module with the following features: Capacitance Sensing. Tough 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.
Based on Freescale MPR121, this sensor has 12 completely independent electrodes with build-in autoconfiguration. Thanks to I2C interface, you can detect all the 12 electrodes signals with only one Grove pott 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 V3 (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 - 12 Key Capacitive I2C Touch Sensor V2 (MPR121), it adds two more GND ports to the head in order to be more stable, meanwhile, the front Pin are spaced more widely so as to avoid a short circuit caused by the lines accidentally touch.
Note
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Features
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
Add two more GND pin and expand the gap of pins for safe handling
Typical Applications
PC Peripherals
MP3 Players
Remote Controls
Mobile Phones
Lighting Controls
Pin Map
Technical details
Dimensions 60mm x 20mm x 7mm
Weight G.W 11g
Battery Exclude
Operating Voltage 3.3 V / 5V
Operating Temperature Range - 40°C to 85°C
Storage Temperature Range - 40°C to 125°C
Capacitances Range 10 pF to over 2000 pF
Resolution 0.01 pF
Interface I2C
I2C address range 0x5B,0x5C,0x5D
Default I2C address 0x5B
Part List
Grove - 12 Key Capacitive I2C Touch Sensor V3 (MPR121) X 1
Grove Cable X 1
