HS-KEY1B Key Switch Module – Digital Push Button Input Board for Arduino and STEM Projects

The HS-KEY1B Key Switch Module is a simple digital push-button input board for menu controls, mode selection, counters, games, and first Arduino lessons. It gives beginners a clean way to connect a button to a controller without building a switch circuit from loose components.

Use it with the ELAB Nano V3, MB 102 Breadboard Kit, or output modules like the RGB Full Color LED Module. For multi-key input, compare it with the 4-way key switch module already in the catalog.

Mechanical buttons need debouncing in software. Confirm whether the module output is active-high or active-low before finalizing code.

Technical Specifications

Board Layout & Label Guide

• Button – User input switch.
• Signal Pin – Digital output to the host.
• VCC – Positive supply if required.
• GND – Common ground.
• Header – Jumper-wire connection point.
• Mounting Area – Fix the module to avoid cable strain.
• Debounce Note – Filter rapid contact bounce in code.
• Logic Note – Test whether pressed is HIGH or LOW.

Application Scenarios

1. Arduino Digital Input

Read the key switch digital output.

const int sensorPin = 2;void setup() { Serial.begin(115200); pinMode(sensorPin, INPUT);}void loop() { Serial.println(digitalRead(sensorPin)); delay(100);}

2. LED Event Output

Turn on an LED when the module is pressed.

const int sensorPin = 2;const int ledPin = 13;void setup() { pinMode(sensorPin, INPUT); pinMode(ledPin, OUTPUT);}void loop() { digitalWrite(ledPin, digitalRead(sensorPin));}

3. MicroPython GPIO Monitor

Monitor the digital output from a Pico-style board.

from machine import Pinimport timesensor = Pin(15, Pin.IN)while True: print(sensor.value()) time.sleep(0.1)

Packing List

• 1 x HS-KEY1B Key Switch Module

FAQ

Q: What is this used for?
A: Digital push-button input.

Q: Does it output analog values?
A: No, it outputs a digital state.

Q: Can I use internal pull-ups?
A: Yes, if the wiring is active-low.

Q: Does it need debounce?
A: Yes.

Q: Can it start a motor or relay?
A: Yes, through controller code and a driver.

Q: Why does it read backward?
A: The module logic may be active-low.

Q: Can it work with ESP32?
A: Yes, if signal voltage is compatible.

Q: What should I test first?
A: Pin mapping, active level, and debounce timing.