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   Senthil .S April 8, 2025 at 12:48 pm

   esp32-c3 with ws2812 led with webserver and ssd1306 display micropython firmware : MicroPython v1.24.1 on 2024-11-29; ESP32C3 module with ESP32C3 hard ware connection : gpio 1,3 sda,scl SSD1306 gpio 2 = ws2812 Din code : import network import socket import neopixel from machine import Pin, I2C, reset from time import sleep import ujson import ssd1306 # === LED + OLED Setup === NUM_LEDS = 1 np = neopixel.NeoPixel(Pin(2), NUM_LEDS) # I2C OLED i2c = I2C(0, scl=Pin(1), sda=Pin(3)) oled = ssd1306.SSD1306_I2C(128, 64, i2c) # === Variables === current_color = (255, 0, 0) brightness = 100 rainbow_mode = False # === Functions === def set_led_color(color, bright): try: if len(color) != 3: print("Invalid color:", color) return r, g, b = [int(c * (bright / 100)) for c in color] np[0] = (r, g, b) np.write() except Exception as e: print("LED color error:", e) def save_state(): try: with open("state.json", "w") as f: ujson.dump({"color": current_color, "brightness": brightness, "rainbow": rainbow_mode}, f) except Exception as e: print("Save error:", e) def load_state(): global current_color, brightness, rainbow_mode try: with open("state.json") as f: state = ujson.load(f) color = state.get("color", [255, 0, 0]) if isinstance(color, list): current_color = tuple(color) brightness = state.get("brightness", 100) rainbow_mode = state.get("rainbow", False) except Exception as e: print("Load error:", e) def update_display(status="Ready"): oled.fill(0) oled.text("Color: {}".format(current_color), 0, 0) oled.text("Brightness: {}".format(brightness), 0, 10) oled.text("Rainbow: {}".format("ON" if rainbow_mode else "OFF"), 0, 20) oled.text(status, 0, 50) oled.show() # === Access Point Setup === ssid = "ESP32_LED" password = "12345678" ap = network.WLAN(network.AP_IF) ap.active(True) ap.config(essid=ssid, password=password) while not ap.active(): pass print("AP active:", ap.ifconfig()) # === HTML Page === def web_page(): r, g, b = current_color hex_color = "%02x%02x%02x" % (r, g, b) return f""" ESP32 LED ESP32 LED Controller Brightness: {brightness}% Toggle Rainbow const cp = document.getElementById('colorPicker'); const b = document.getElementById('brightness'); const bv = document.getElementById('bval'); cp.oninput = () => fetch('/color?hex=' + cp.value.substring(1)); b.oninput = () => {{ bv.innerText = b.value; fetch('/brightness?val=' + b.value); }}; """ # === Web Server === s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(('', 80)) s.listen(5) # === Initial State === load_state() set_led_color(current_color, brightness) update_display("Booted") # === Main Loop === while True: conn, addr = s.accept() print("Client connected:", addr) try: request = conn.recv(1024).decode() request = request.replace("\r", "").replace("\n", "") if "/rainbow" in request: rainbow_mode = not rainbow_mode save_state() if not rainbow_mode: set_led_color(current_color, brightness) update_display("Rainbow {}".format("ON" if rainbow_mode else "OFF")) elif "/brightness?val=" in request: try: val = int(request.split("/brightness?val=")[1].split(" ")[0]) brightness = max(0, min(100, val)) if not rainbow_mode: set_led_color(current_color, brightness) save_state() update_display("Brightness {}".format(brightness)) except Exception as e: print("Brightness error:", e) elif "/color?hex=" in request: try: hex_str = request.split("/color?hex=")[1].split(" ")[0].strip() if len(hex_str) == 6: color = int(hex_str, 16) r = (color >> 16) & 0xFF g = (color >> 8) & 0xFF b = color & 0xFF current_color = (r, g, b) rainbow_mode = False set_led_color(current_color, brightness) save_state() update_display("Color Set") else: print("Invalid hex string:", hex_str) except Exception as e: print("Color error:", e) response = web_page() conn.send("HTTP/1.1 200 OK\r\nContent-type: text/html\r\n\r\n") conn.sendall(response.encode()) except Exception as e: print("Request error:", e) finally: conn.close()

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