AD Keyboard Simulate Five Key Module Button Sensor

AD Keyboard Simulate Five Key Module Button Sensor is an ingenious and highly efficient input device that simplifies the process of reading multiple buttons using only a single analog input pin on a microcontroller, such as an Arduino. This module achieves its simplicity by using a unique resistor ladder network. Each of the five onboard push buttons connects to a different resistor value, creating a unique voltage division when pressed. When you read the analog voltage from the single output pin, the microcontroller receives a distinct voltage level corresponding to a specific button. This design frees up valuable digital I/O pins, making it a favorite for projects that are pin-limited, and streamlines your code for handling multiple user inputs.

Key Features:

• Single-Pin Analog Output: Consolidates five distinct button inputs onto a single analog output line, conserving microcontroller I/O resources.
• Resistive Voltage Division: Utilizes a precise resistor ladder network to generate five unique analog voltage values for reliable button recognition.
• Five Independent Buttons: Features dedicated buttons for Up, Down, Left, Right, and Select, mirroring a common directional keypad layout.
• Microcontroller Compatibility: Works seamlessly with any platform that has an Analog-to-Digital Converter (ADC), including Arduino, Raspberry Pi Pico, and ESP32.
• Compact Design: The small PCB integrates the keys and circuitry, making it easy to mount in a control panel or project enclosure.

Technical Specifications:

• Operating Voltage: 3.3 V to 5 V DC
• Input Type: 5 Push Buttons (Up, Down, Left, Right, Select)
• Output Type: Single Analog Voltage Signal
• Resistor Network: Precision Resistor Ladder
• Output Values: 5 unique analog voltage levels corresponding to the 5 buttons.
• Logic Level: Matches the input voltage (VCC)

Mechanical Specifications:

• Mounting Holes: Typically includes two mounting holes for fixed installation.
• Interface: 3-pin header (VCC, GND, Signal) for simple connection.
• Switch Type: Tactile Push Buttons.

Dimensions:

• Board Length: ~40 mm
• Board Width: ~40 mm
• Button Pitch: Varies, designed for finger operation.

Pinout and Wiring:

• VCC: Power supply input (connects to 5V or 3.3V on the microcontroller).
• GND: Ground connection.
• SIG (Signal/AD): Analog output pin (connects to one of the microcontroller’s analog input pins, e.g., Arduino A0).
• Wiring Note: Only three wires are necessary to fully integrate this module. Connect the SIG pin to an ADC channel, then read the unique digital value (0-1023 on a 10-bit ADC) to determine which of the five buttons the user pressed.

Datasheet Reference:

• Download Module Reference Sheet

Commonly Used in:

• Educational Kits: A simple, clear example of analog input and voltage division for teaching electronics.
• Prototyping: Quickly integrate user navigation without wasting I/O pins.
• Pin-Limited Microcontrollers: Essential for ATtiny or other small microcontrollers where I/O pins are scarce.

Applications:

• Menu Navigation: Use the five buttons for controlling settings and scrolling through menus on an LCD or OLED screen.
• Simple Game Controllers: Develop basic retro games or interactive displays requiring directional input.
• Parameter Adjustment: Set temperature, time, or other operational limits in automation projects.

Equivalent Models:

• Keypad Matrix: A traditional solution (e.g., 4×4) that requires more I/O pins but offers more buttons.
• I2C Keypad: A module that uses the I2C bus to save pins, but requires a more complex communication protocol.

Package Includes:

• 1 x AD Keyboard Simulate Five Key Module Button Sensor