An Arduino library for TTP229 module for controlling a 16 capacitive touch keys.

Tested with the Robotdyn 16 Keys I2C Capacitive Touch TTP229 Module Robotdyn Capacitive Touch Disk Pad.

• Uno:

  • SDA <-> A4 (SDA)
  • SCL <-> A5 (SCL)

• Mega:

  • SDA <-> 20 (SDA)
  • SCL <-> 21 (SCL)

• Leo:

  • SDA <-> 2 (SDA)
  • SCL <-> 3 (SCL)

• ESP32-WROOM-32:

  • SDA <-> GPIO 21 (SDA)
  • SCL <-> GPIO 22 (SCL)

• uint16_t readKeys() - Read data from TTP229 and return states of 16 keys in bitmap representation. This method should call before other methods. Put it into loop function.

• int getKey() - Return number of pressed key or return -1 if no one key is pressed.

• bool isKeyPress(byte key) - Return true if key is pressed.

• bool isKeyDown(byte key) - Return true if key is down.

• bool isKeyUp(byte key) - Return true if key is up.

#include <Wire.h>
#include <TTP229.h>

TTP229 ttp229;

void setup()
{
    Wire.begin();
    Serial.begin(9600);
}

void loop()
{
    ttp229.readKeys();

    Serial.print("Key states: ");
    for (int i = 0; i < 16; ++i) {
        if (ttp229.isKeyPress(i)) {
            Serial.print("1 ");
        } else {
            Serial.print("0 ");
        }
    }

    int key = ttp229.getKey();
    Serial.print("Pressed key: ");
    Serial.print(key);

    Serial.print("   ");
    if (ttp229.isKeyDown(0)) {
        Serial.print("Key 0 is down");
    } else if (ttp229.isKeyUp(0)) {
        Serial.print("Key 0 is up");
    }

    Serial.println();
    delay(500);
}

Copyright (c) 2019 Alexander Kiryanenko. Licensed under the MIT license.