Demo code for TTP229L 16-Channel Touch HAT using CircuitPython/Blinka libraries on Raspberry Pi

TouchHAT_TTP229L.py

"""
Hardware
- Raspberry Pi 4 Model B
  https://my.cytron.io/p-raspberry-pi-4-model-b?tracking=idris
- Raspberry Pi Approved MakerDisk microSD Card with RPi OS
  https://my.cytron.io/p-raspberry-pi-approved-makerdisk-microsd-with-rpi-os??tracking=idris
- TTP229L 16-Channel Touch HAT for Raspberry Pi
  https://my.cytron.io/p-ttp229l-16-channel-touch-hat-for-raspberry-pi?tracking=idris
- Official RPi 15W (5V/3A) PSU USB C UK Plug
  https://my.cytron.io/c-power-for-rpi-4/p-official-rpi-15w-5v-3a-psu-usb-c-uk-plug-white?tracking=idris

Step 1:
- Install CircuitPython Libraries on Raspberry Pi
  https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

Step 2:
- Install Adafruit CircuitPython BusDevice
  pip3 install adafruit-circuitpython-busdevice

Step 3:
- Run the code

Last update on 10 Sept 2021, by Idris
"""

import time
import board
import busio
from adafruit_bus_device.i2c_device import I2CDevice

i2c = board.I2C()
ADDRESS = 0x57
ttp229l = I2CDevice(i2c, ADDRESS)

touchpad = [
    "Right", "Up", "Left", "Plus", "Power", "Raspberry Pi", "keyestudio", 
    "Triangle", "Square", "Circle", "Cross", "R", "Down", "L", "Minus",
    "Not detected"
]

def read_touch_hat():
    bytes_read = bytearray(2)
    ttp229l.readinto(bytes_read)
    data = bytes_read[1] << 8 | bytes_read[0]
    #print("TTP229: {:016b}".format(data))
    for i in range(16):
        if data >> i == 1:
            break
    return i

while True:
    pad_index = read_touch_hat()
    if touchpad[pad_index] != "Not detected":
        print(touchpad[pad_index])
    time.sleep(0.2)