Waveshare RPi Touch Keypad for Raspberry Pi

Description

Features
1. Support any revision of Raspberry Pi (directly-pluggable)
2. Provide your Pi with 16 touch keys
3. Features TONTEK TonTouch touch pad detector IC TTP229-LSF, support up to 16 keys with adjustable sensitivity and built-in LDO
4. The system re-calibrates automatically when all keys are not detected touch more than about 4 seconds

Specifications
1. Interface : I2C
2. Keys : 16
3. Sampling rate : 8Hz
4. Human Body Mode : 6KV
5. Operating voltage : 2.4V-5.5V
6. Operating temperature: -40 degree C to +85 degree C
7. Storage temperature: -50d egree C to +125 degree C
8. Dimensions : 8.5CM x 5.6CM

How to Use
After power-on have about 0.5sec stable-time. During the time do not touch the key pad, and all functions are disabled

Pinouts
1. VCC: Power supply (2.4V-5.5V)
2. GND: Ground
3. SDA: I2C SDA
4. SCL: I2C SCL