M5Stack Mechanical Key Button Unit

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Product Link

M5Stack Mechanical Key Button UnitOpenELAB

Introduction

Unit Key is a single mechanical key input unit with built-in RGB LED. The key shaft adopts Blue switch with tactile bump and audible click features. Embedded with one programable RGB LED - SK6812, supports 256 level brightness. Two digital IOs are available for key status and LED control key status and lighting control. Suitable for multiple HMI applications.

Features

• Blue switch with tactile bump and audible click

• Programable RGB LED - SK6812

Specifications

Specification	Parameters
Power Supply	DC 5V
Output Logical Signal	DC 3.3V
Standby Current	DC5V@2mA
Operating current	DC5V@13mA
Net weight	7.6g
Gross weight	13.1g
Product Dimensions	40 * 24 * 22.6mm
Package Size	90 * 135mm

Pinout

Dimensions

size:13.1g

weight:40 * 24 * 22.6mm

How to Use

• UNIT Key Example

• FastLED Library

• FastLED API Reference

#include <FastLED.h>
#include <M5Stack.h>

uint8_t ledColor = 0;

#define KEY_PIN  36
#define LED_PIN 26

CRGB LED[1];

void setup() {
    M5.begin();
    M5.Lcd.setTextSize(3);
    M5.Lcd.print("\n UNIT-KEY Example\n\n    Key State:");
    /* Init key pin */
    pinMode(KEY_PIN, INPUT_PULLUP);
    /* Init RGB led */
    FastLED.addLeds<SK6812, LED_PIN, GRB>(LED, 1);
    LED[0] = CRGB::Blue;
    FastLED.setBrightness(0);
}

void loop() {
    /* If Key was pressed */
    if (!digitalRead(KEY_PIN)) {
        M5.Lcd.setCursor(75, 130);
        M5.Lcd.print((" Pressed "));
        FastLED.setBrightness(255);
        FastLED.show();
        /* Hold until the key released */
        while (!digitalRead(KEY_PIN))
            ;
    } else {
        M5.Lcd.setCursor(75, 130);
        M5.Lcd.println(("Released"));
        FastLED.setBrightness(0);
        FastLED.show();
    }
    delay(100);
}