Grove - 12 Key Capacitive I2C Touch Sensor V3 (MPR121)

Grove - 12 Key Capacitive I2C Touch Sensor V3 (MPR121), Capacitance Sensor

Out of stock
  • 10+: $5.40


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.


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
  • 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

Dimensions60mm 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


HSCODE 9031900090
USHSCODE 9031808070




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We made a piano using a touch sensor, as well as leaves for piano keys.
A pitch timer & clap-o-meter, fully based on the Seeed Studio's grove system for Arduino
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.



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