This project enables an ESP32 (or compatible board) to periodically fetch scheduled time from a local Python API, compare it with the current local time, and notify via NeoPixel LED if the event is approaching.

• language Python
• language C++ (Arduino)
• Sample file Json
• ESP32 S3 (Board)

• ESP32 board (or similar)
• 1x WS2812 (NeoPixel) LED
• Wi-Fi access point
• USB cable, power source

• Connects to Wi-Fi and syncs time via NTP (Iran timezone GMT+3:30)
• Sends HTTP GET requests to a local Python API
• Parses time from JSON response
• If time is close (within 2 minutes), LED blinks yellow
• If connected and working normally, LED flashes green briefly
• Red and orange blinking indicates errors (Wi-Fi or API)

• Configure Wi-Fi credentials:

  const char* ssid = "USERNAME-AP";
  const char* password = "PASSWORD-AP";

• Simple Flask server returning time as JSON:

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/time')
def send_time():
    return jsonify(hour=18, minute=35)  # Update manually or from DB

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=44555)

• Install Flask:
• (Windows)

py -m pip install flask

• (Linux)

pip install flask

npx json-server --watch time.json

• Normal mode of the device:

• The device is not connected to the network:

• Device data receiving mode from API:

• Promised time mode: