TTP226 8-Channel Capacitive Touch Pad Sensor Documentation
The TTP226 is an 8-channel capacitive touch pad sensor that provides a convenient and reliable way to detect touch inputs. This sensor is widely used in various applications, including IoT projects, robotics, and interactive installations.
The TTP226 sensor has a total of 15 pins, with the following pinout:
VCC: Power supply voltage (2.5V to 5.5V)
GND: Ground
SCL: I2C clock pin
SDA: I2C data pin
CH0-CH7: Touch channel pins (active low output)
INT: Interrupt pin (active low output)
The TTP226 sensor uses the I2C communication protocol to communicate with a microcontroller or other devices.
### Example 1: Basic Touch Detection using Arduino
In this example, we will use an Arduino board to read the touch status of the TTP226 sensor.
#define TTP226_ADDRESS 0x5A
void setup() {
Serial.begin(9600);
Wire.begin();
}
void loop() {
byte data = 0;
Wire.beginTransmission(TTP226_ADDRESS);
Wire.write(0x01); // Register address for touch status
Wire.endTransmission();
Wire.requestFrom(TTP226_ADDRESS, 1);
data = Wire.read();
for (int i = 0; i < 8; i++) {
if (data & (1 << i)) {
Serial.print("Touch detected on channel ");
Serial.println(i);
}
}
### Example 2: Interrupt-based Touch Detection using Raspberry Pi (Python)
In this example, we will use a Raspberry Pi to read the touch status of the TTP226 sensor using interrupt-based detection.
```python
import RPi.GPIO as GPIO
import time
# Set up GPIO library
GPIO.setmode(GPIO.BCM)
# Define TTP226 interrupt pin
INT_PIN = 17
# Set up interrupt pin as input
GPIO.setup(INT_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
def touch_detected(channel):
# Read touch status from TTP226 sensor
data = i2c.readU8(TTP226_ADDRESS, 0x01)
for i in range(8):
if data & (1 << i):
print(f"Touch detected on channel {i}")
# Set up interrupt on rising edge
GPIO.add_event_detect(INT_PIN, GPIO.RISING, callback=touch_detected)
while True:
time.sleep(1)
```
Note: In this example, you will need to install the `RPi.GPIO` and `smbus` libraries to use the I2C communication protocol.
These code examples demonstrate the basic usage of the TTP226 8-Channel Capacitive Touch Pad Sensor in different contexts. You can modify and expand these examples to suit your specific project requirements.
