ESP8266 NodeMCU RGB LED Busy Server

ESP8266 NodeMCU RGB LED Busy Server.ino

/* ESP8266 NodeMCU RGB LED Busy Server
 *  
 * Set an RGB LED to current status via web request 
 * 
 * 1. Flash this file to a ESP-12E
 * 2. Open Serial to get the IP address of board
 * 3. Optionally set a dedicated DHCP reservation at the router level to ensure same IP address is used
 * 4. Connect common anode or common cathode RGB LED (see pins below)
 * 5. Make `GET` request to `http://<IP>/<status>`
 *
 * Statuses:
 *
 * - 🔴 `/busy`
 * - 🟢 `/available`
 * - 🟡 `/away`
 * - ⚫️ `/offline`
 * 
 * @see https://davidsword.ca/esp8266-busy-server/
 */
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

// @see https://github.com/BretStateham/RGBLED
// must install this library in Arduino IDE
#include <RGBLED.h>

uint8_t red_led   = 16; // D0
uint8_t green_led = 5;  // D1
uint8_t blue_led  = 4;  // D2

ESP8266WebServer server;
RGBLED rgbLed( red_led, green_led, blue_led, COMMON_CATHODE ); // or `COMMON_ANODE` if using common anode RGB LED instead

char* ssid        = ""; // <<< enter your WIFI network name
char* password    = ""; // <<< enter your WIFI password

void setup()
{
  Serial.begin(115200);
  WiFi.begin(ssid,password);
  while(WiFi.status()!=WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println("");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
  
  digitalWrite(BUILTIN_LED, LOW);
  rgbLed.writeRGB(255,255,255);

  server.on("/",[](){server.send(200,"text/plain","see readme");});
  // @TODO can output current state on /status requests
    // server.on("/status",[](){server.send(200,"text/plain", "(r,g,b)=(" + String(rgbLed.redValue) + "," + String(rgbLed.greenValue) + "," + String(rgbLed.blueValue) + ")" });
  server.on("/busy",setBusy);
  server.on("/available",setAvailable);
  server.on("/away",setAway);
  server.on("/offline",setOffline);
  server.on("/off",setOffline);
  server.begin();
}

void loop()
{
  server.handleClient();
}

void setBusy()
{
  rgbLed.writeRGB(50,0,0); // red. not using the full `255` in an attempt to reduce brightness.
  server.send(204,"");
}
void setAvailable()
{
  rgbLed.writeRGB(0,25,0); // green
  server.send(204,"");
}
void setAway()
{
  rgbLed.writeRGB(100,25,0); // yellow. mix wasn't 50/50 red/green as expected. this might be different for each make of LED.
  server.send(204,"");
}
void setOffline()
{
  rgbLed.turnOff();
  server.send(204,"");
}