The TTP229 16 Key Capacitive Touch Switch Digital Keypad Module detects touch on sixteen conductive pads and sends key data over a 2-wire serial interface. Press any of the 16 pads and the module outputs the corresponding digital signal without any mechanical contact. The ttp229 16 key capacitive keypad runs on 2.4V to 5.5V, connecting to Arduino, ESP32, and other common boards.
The ttp229 touch keypad takes 4.0 seconds to calibrate its baseline after power-on. A non-obvious limitation is that the 2-wire serial interface is a proprietary TTP229 protocol, not standard I2C, so you need a specific software bit-bang routine or library to decode key presses correctly. Reading it with standard Wire.h will give incorrect results. The 16key Capacitive Touch Switch delivers accurate digital signals when the protocol is implemented correctly.
kiosk builders, and UI panel designers use the ttp229 keypad module with Arduino and dedicated libraries. StemVolt provide this module with all 16 pads labelled.
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Features:
- Operating voltage of 2.4V to 5.5V covers 3.3V and 5V microcontroller supply rails
- Sixteen capacitive touch keys eliminate mechanical wear over repeated press cycles
- Calibration time of 4.0 seconds sets baseline automatically on every power cycle
- Digital signal output accurately reflects which key is pressed via serial bit stream
Technical specifications:
| Specification | Details |
|---|---|
| Operating Voltage (VDC) | 2.4V to 5.5V |
| Number of Keys | 16 capacitive touch keys |
| Output Type | Digital signal |
| Calibration Time | 4.0sec |
| 2-Wires Serial Interface | High or low |
| Delivering | Accurate digital signals |
Applications:
- Access control panel uses TTP229 16 Key Capacitive Touch Switch Digital Keypad Module to enter PIN codes touchlessly
- Smart home control hub maps all 16 ttp229 capacitive touch pads to scene activation commands
- Numeric data entry terminal replaces physical keypad with ttp229 Capacitive Touch Switch inputs behind a sealed panel
Package includes:
- 1 x TTP229 16 Key Capacitive Touch Switch Digital Keypad Module
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