Add example.

Author: Forairaaaaa

examples/Unit/KEY/KEY-DEMO1/KEY-DEMO1.ino

@@ -0,0 +1,58 @@
+/*
+*******************************************************************************
+* Copyright (c) 2022 by M5Stack
+*                  Equipped with M5Core sample source code
+*                          配套  M5Core 示例源代码
+* Visit the website for more information: https://docs.m5stack.com/zh_CN/products
+* 获取更多资料请访问: https://docs.m5stack.com/zh_CN/products
+*
+* Please follow the steps below to add FastLED library:
+* - Arduino menu --> Manage Libraries... --> FastLED --> install
+* 在烧录前请按以下步骤添加 FastLED 库:
+* - Arduino menu --> Manage Libraries... --> FastLED --> install
+*
+* describe: KEY.  按键.
+* date: 2022/6/1
+*******************************************************************************
+*/
+
+#include <M5Stack.h>
+#include <FastLED.h>
+
+uint8_t ledColor = 0;
+
+#define KEY_PIN  36
+#define DATA_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, DATA_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);
+}