Initial import

.gitignore

+.pioenvs
+.piolibdeps
+.clang_complete
+.gcc-flags.json

platformio.ini

+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; http://docs.platformio.org/page/projectconf.html
+
+[env:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino

src/main.cpp

+#include <Arduino.h>
+
+/******************************************************************************/
+/*                              Pin Definition                                */
+/******************************************************************************/
+#define RGB_LED_R (15)
+#define RGB_LED_G (12)
+#define RGB_LED_B (13)
+#define BUTTON_PIN (4)
+#define LDR_PIN (0)
+
+/******************************************************************************/
+/*                              Global Variable                               */
+/******************************************************************************/
+static uint8_t down = 0;
+static uint16_t ldr = 0;
+static uint8_t color = 0;
+
+/**************/
+/* Setting up */
+/**************/
+void setup() {
+    Serial.begin(115200);
+    Serial.println("Initialization");
+
+    pinMode(RGB_LED_R, OUTPUT);
+    pinMode(RGB_LED_G, OUTPUT);
+    pinMode(RGB_LED_B, OUTPUT);
+    pinMode(BUTTON_PIN, INPUT);
+    pinMode(LDR_PIN, INPUT);
+}
+
+/**************************************/
+/* Compute next state and show output */
+/**************************************/
+void next()
+{
+    Serial.printf("Color RGB: #%02x%02x%02x\n",
+                    (color & 0x04) ? 255 : 0,
+                    (color & 0x02) ? 255 : 0,
+                    (color & 0x01) ? 255 : 0);
+    digitalWrite(RGB_LED_R, (color & 0x04) ? HIGH : LOW);
+    digitalWrite(RGB_LED_G, (color & 0x02) ? HIGH : LOW);
+    digitalWrite(RGB_LED_B, (color & 0x01) ? HIGH : LOW);
+    ldr = analogRead(LDR_PIN);
+    Serial.printf("Lumens: %d%%\n", ldr * 100 / 1024);
+    color++;
+    color %= 0x08;
+}
+
+/********************************/
+/* Scan user input in main loop */
+/********************************/
+void loop() {
+    int button = digitalRead(BUTTON_PIN);
+
+    if (down && button) {
+        Serial.printf("KeyRelease\n");
+        next();
+    }
+
+    down = (button == 0 ? 1 : 0);
+
+    delay(50);
+}