AD Keyboard 5-Key Analog Button Module — Single Analog Pin, Arduino Sensor Shield

AD Keyboard 5-Key Analog Button Module Single Analog Pin, Arduino Sensor Shield

$8.12 USD

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AD Keyboard 5-Key Analog Button Module — Single Analog Pin Interface

The AD Keyboard module provides 5 independent push buttons on a single analog input pin using a resistor ladder voltage divider. Each button produces a unique analog voltage level, allowing an Arduino or MCU to identify which button is pressed with just one analogRead() call — saving precious GPIO pins.

Key Specifications

Parameter	Value
Number of Buttons	5
Interface	Single analog output pin (SIG)
Supply Voltage	3.3V – 5V DC
Output Type	Analog voltage (resistor ladder)
Connector	3-pin (VCC, GND, SIG)
Compatible	Arduino Sensor Shield, breadboard

Analog Output Voltage (@ 5V VCC)

Button	Approx. Voltage	analogRead() Value
S1	~0V	~0
S2	~1.0V	~204
S3	~2.0V	~409
S4	~3.0V	~614
S5	~4.0V	~818
None pressed	~5V	~1023

Why Choose This AD Keyboard Module?

Single Pin for 5 Buttons — Saves 4 GPIO pins vs. individual digital button wiring
Sensor Shield Compatible — 3-pin connector fits Arduino sensor shield analog ports directly
No Library Required — Simple analogRead() with threshold comparison in your sketch
Debounce-Friendly — Resistor ladder output is stable; add software debounce for clean reads
Compact PCB — Small footprint for panel-mount or breadboard use

Typical Applications

Arduino menu navigation (up/down/left/right/select)
LCD display menu control with minimal wiring
Sensor shield button expansion
Remote control input for robots and vehicles
Game controller directional input

Arduino Example

int val = analogRead(A0);
if (val < 50) { // S1 pressed }
else if (val < 250) { // S2 pressed }
else if (val < 450) { // S3 pressed }
else if (val < 650) { // S4 pressed }
else if (val < 850) { // S5 pressed }

FAQ

Q: Can two buttons be pressed simultaneously?
A: No — the resistor ladder only produces one unique voltage at a time. Simultaneous presses produce an undefined intermediate voltage.

Q: Does it work at 3.3V (ESP32/STM32)?
A: Yes — supply with 3.3V and adjust analogRead() thresholds proportionally (divide all values by ~1.52).