#include <ESP8266WiFi.
h>
#include <ESP8266WebServer.h>
const char *ssid = "NodeMCU_LED_AP";
const char *password = "12345678";
ESP8266WebServer server(80);
// LED pins
#define LED1_PIN D0 // GPIO16 (no PWM)
#define LED2_PIN D1 // GPIO5 (supports PWM)
bool led1State = false;
int led2Brightness = 0; // 0-1023 for analogWrite
// Reusable digital LED control function
void setDigitalLED(uint8_t pin, bool state) {
digitalWrite(pin, state ? LOW : HIGH); // active LOW
}
// Reusable analog LED brightness function
void setPWMBrightness(uint8_t pin, int brightness) {
brightness = constrain(brightness, 0, 1023);
analogWrite(pin, brightness);
}
void handleControl() {
if (server.hasArg("led") && server.hasArg("state")) {
int led = server.arg("led").toInt();
String state = server.arg("state");
if (led == 1) {
led1State = (state == "on");
setDigitalLED(LED1_PIN, led1State);
} else if (led == 2 && server.hasArg("brightness")) {
led2Brightness = server.arg("brightness").toInt();
setPWMBrightness(LED2_PIN, led2Brightness);
}
}
server.sendHeader("Location", "/");
server.send(303); // Redirect to home
}
void handleRoot() {
String html = "<html><head><title>LED Control</title></head><body>";
html += "<h2>Control LEDs using Query Params</h2>";
// Motor 11 buttons
html += "<h3>m11 (ON/OFF)</h3>";
html += "<a
href=\"/control?m11&state=on\"><button>backward</button></a><br><br>";
html += "<a
href=\"/control?m11&state=off\"><button>forward</button></a><br><br>";h
html += "<script>";
html += "function updateBrightness(val) {";
html += " fetch(`/control?led=2&state=on&brightness=` + val);";
html += "}";
html += "</script>";
html += "</body></html>";
server.send(200, "text/html", html);
}
void setup() {
Serial.begin(115200);
pinMode(LED1_PIN, OUTPUT);
digitalWrite(LED1_PIN, HIGH); // OFF initially
pinMode(LED2_PIN, OUTPUT);
analogWriteRange(255); // 10-bit PWM
analogWrite(LED2_PIN, 0); // OFF initially
WiFi.softAP(ssid, password);
Serial.println("Access Point Started");
Serial.print("IP: ");
Serial.println(WiFi.softAPIP());
server.on("/", handleRoot);
server.on("/control", handleControl);
server.begin();
Serial.println("HTTP Server started");
}
void loop() {
server.handleClient();
}
