M5Stack Limit Switch Unit

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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

Switch Bar Length 16mm
Mechanical Lifetime 400K Times
Power Supply DC 5V
Output Logical Signal DC 3.3V
Standby Current DC5V@2mA
Operation Current DC5V@3mA
Net Weight 6.3g
Gross Weight 11.4g
Product Size 37 * 24 * 9.5mm
Package Size 92 * 135mm

Resources

Pinout

M5CORE - PORT B G36
UNIT Limit Input

Arduino Example

#include 

#define KEY_PIN 36 

void setup() {
    M5.begin();  
    M5.Lcd.setTextSize(4);
    M5.Lcd.print(("\n  UNIT-LIMIT\n  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);
}

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