Touch Switch Digital Sensor 16 Button TTP229 Capacitive

Features

• Based on TTP229 IC
• 16 capacitive touch keys
• Selectable 8-key or 16-key mode
• Separate outputs for 8 keys in 8-key mode
• Supports toggle or momentary output modes
• Configurable output polarity (active-high or active-low)
• 0.5 second startup calibration delay
• Low standby current (2.5μA at 3V)
• On-board power indicator LED

Specifications

• Operating Voltage: 2.4V – 5.5V
• Standby Current: 2.5μA @ 3V
• Operating Modes: 8 or 16 key
• PCB Size: 49.3mm x 64.5mm

Pinout

1. VCC – Supply Voltage (2.4V to 5.5V)
2. GND – Ground
3. SCL – Serial Clock Input
4. SDO – Serial Data Output
5. OUT 1 – Key 1 State
6. OUT 2 – Key 2 State
7. OUT 3 – Key 3 State
8. OUT 4 – Key 4 State
9. OUT 5 – Key 5 State
10. OUT 6 – Key 6 State
11. OUT 7 – Key 7 State
12. OUT 8 – Key 8 State

Example Arduino Wiring (16-Key Mode)

• TTP229 VCC to Arduino VCC
• TTP229 GND to Arduino GND
• TTP229 SCL to Arduino Pin 2
• TTP229 SDO to Arduino Pin 3
• TTP229 TP2 to GND via 1 MΩ resistor (only needed for some modules)

Important: Reconnect power after changing jumper settings for changes to take effect.

Example Arduino Code

// TTP229 16-Key Touch Sensor Example

#include <TTP229.h>

const int SCL_PIN = 2;  // Clock Pin
const int SDO_PIN = 3;  // Data Pin

TTP229 ttp229(SCL_PIN, SDO_PIN);

void setup() {
  Serial.begin(115200);
  Serial.println("Start Touching One Key At a Time!");
}

void loop() {
  uint8_t key = ttp229.ReadKey16();  // Blocking read
  if (key)
    Serial.println(key);

  // Non-blocking alternative:
  // uint8_t key = ttp229.GetKey16();
  // Serial.println(key);
}