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 * Product Documentation * Schematic * Arduino Example Pinout M5CORE - PORT B G36 UNIT Limit Input Arduino Example #include #define KEYPIN 36 void setup() { M5.begin(); M5.Lcd.setTextSize(4); M5.Lcd.print(("\n UNIT-LIMIT\n Example")); pinMode(KEYPIN, INPUTPULLUP); } void loop() { if (!digitalRead(KEYPIN)) { M5.Lcd.setCursor(0, 130); M5.Lcd.print((" Hit limit!")); } else { M5.Lcd.setCursor(0, 130); M5.Lcd.println((" ")); } delay(100); } https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2023-03-07 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2023-12-27 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2024-09-18 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2024-11-29 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2024-11-30 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2025-04-29 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2025-11-28 https://elecena.pl/product/22727653/m5stack-limit-switch-unit 2025-11-29