The Unit Limit from M5Stack is a limit switch sensor. When the switch bar is pressed, the digital single of the Unit would change from 3.3V to 0V, which may generate a limit signal to MCU or other peripherals.

Applied for multiple mechanical equipment to achieve limit protection.

Features

• Contact limit switch
• Long durability, up to 400K times lifetime
• Multiple installation methods

Package Contents

• 1x Unit limit
• 1x HY2.0 4-pin Cable (20cm)

Specifications

Resources

• Product Documentation
• Schematic
• Arduino Example

Pinout

Arduino Example

#include #define KEY_PIN 36 void setup() { M5.begin(); M5.Lcd.setTextSize(4); M5.Lcd.print((” UNIT-LIMIT Example”)); pinMode(KEY_PIN, INPUT_PULLUP);}void loop() { if (!digitalRead(KEY_PIN)) { M5.Lcd.setCursor(0, 130); M5.Lcd.print((” Hit limit!”)); } else { M5.Lcd.setCursor(0, 130); M5.Lcd.println((” “)); } delay(100);}