TTP229 (touch keyboard) for Arduino

The module is a low cost 4 x 4 touch keyboard for projects that require manual input and output. There are 16 sensor pads on the sensor board with numbers 1 - 16. A feature of the module is its low power consumption, with which you can connect the board to self-powered portable devices.

Touch keyboard based on TTP229 chip. The microcircuit transmits data on button presses via a two-wire communication line with a serial SPI interface. The chip also has 8 buffers in which there is a choice of the type of logical output. If there is no activity for a specified time, the module automatically goes into sleep mode. The chip has a fairly low power consumption of 2 - 9 uA.

Keyboard operating modes are configured using jumpers on pads P1 and P2. To work in the mode with 16 keys, you must set a jumper between pins 3 and 7 of the P1 connector. With the help of capacitors placed on the board, you can change the sensitivity of the touch sensors.

The module is connected to the microprocessor device via 2 contacts (SCL and SD0). The SCL output is used to transmit clock pulses by the microcontroller to an external device, and the SD0 line transmits information about the state of the touch buttons. Digital contacts OUT1 - OUT8 are used for operation in 8 button mode. Power is supplied to the board using the VCC and GND pins with a nominal value of 5 V. The module has a red LED that lights up when voltage is applied.
Module Specifications:

Supply voltage, V 2.4 ... 5.5
Current consumption, mA 100
Chip TTP229
Number of keys 16
Operating temperature, °C 0 ... +70
Module dimensions, mm 65 x 50 x 10
Weight, g 15

Scheme for connecting the module to Arduino Uno: