A
Anonymous
Apr 02, 2026
Rating: 4/5
Solid choice for I2C
Saves GPIO pins compared to direct wiring. Worth the price for complex interfaces.
Description
[Jiexingtai Electronics] MPR121 Proximity Capacitive Touch Sensor Module IIC Interface Digital Keypad
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Brand | Jiexingtai Electronics |
| Model Number | MPR121 |
| Interface Type | I²C (Inter-Integrated Circuit) |
| Operating Voltage | 3.3V to 5.5V DC |
| Touch Channels | 12 Capacitive Inputs |
| Communication Protocol | I2C Bus |
| PCB Dimensions | 20mm x 15mm |
| Module Weight | 3 grams |
| Mounting Hole Size | 3mm Diameter |
| Microcontroller Compatibility | Arduino, Raspberry Pi, ESP32 |
5 reviews
A
Anonymous
Mar 15, 2026
Rating: 5/5
Reliable sensor
Used this for a keypad project. No false triggers so far. Very stable performance.
A
Anonymous
Mar 09, 2026
Rating: 4/5
Good sensitivity
Sensitivity is adjustable which is nice. Documentation could be slightly more detailed for beginners.
A
Anonymous
Mar 05, 2026
Rating: 5/5
Great for DIY projects
Works perfectly with my Arduino Uno. Easy to set up and the sensitivity is adjustable.
A
Anonymous
Jan 22, 2026
Rating: 5/5
Exactly as described
Fast shipping and the module works out of the box. Pins are clearly labeled.
5 FAQ
Q: Is there a library available?
A: Yes, several open-source Arduino libraries support the MPR121 chip.
Q: Can I connect multiple modules?
A: Yes, you can connect multiple modules using address selection pins on the I2C bus.
Q: What is the response time?
A: The typical response time is around 35ms per electrode scan cycle.
Q: Do I need pull-up resistors?
A: External pull-up resistors are recommended for the I2C SDA and SCL lines.
Q: Does this work with 5V logic?
A: Yes, the module supports operating voltages from 3.3V to 5.5V.
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