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ACEBOTT New Large Button Large Capacitive Touch 4*4 Matrix Array Keypad Membrane Switch Module for Compatible With ESP32/Arduino
Product Description
Product Description
The 4x4 touch keyboard module is an input device used to input data into a computer or other electronic device. Each key is a capacitive touch design with a 4-row, 4-column layout. When a finger touches a key, the internal circuit detects the change in capacitance and outputs the corresponding press information.
Application: Password doors, calculators, ATM machines, mobile phones, etc.
| Operating voltage | 3.3V~5V |
| Operating temperature | -40°C~+85°C |
| Communication method | I2C |
| Size | 5.6cm * 7.8cm |
Connection Diagram
| 4×4 Touch Keyboard | ESP32 |
| SCL | SCL |
| SDA | SDA |
| VCC | 5V |
| GND | GND |
| Note: Expansion board is attached to esp32 controller board. | |
Frequently Asked Questions
1. What is the working principle of the keyboard? It uses capacitive sensing technology to detect finger touch.
2. What communication protocol does it use? It uses the standard I2C communication protocol.
3. Is it compatible with 3.3V systems? Yes, the operating voltage range is 3.3V to 5V.
4. Can this be used for outdoor keypad locks? Yes, it performs well within the temperature range of -40°C to +85°C.
5. How do I connect this to an ESP32? Use the SCL and SDA pins provided on the board to connect to the ESP3
2 controller.
