ESP32 IoT Project with ESP-NOW and Blynk Integration SOLAR PANEL SURFACE CONDITIONING

Overview This repository contains four ESP32-based codes designed to work together using ESP-NOW protocol for wireless communication and Blynk IoT platform for remote monitoring and control. The system is optimized for real-time data transmission, automated scheduling, and sensor-based actuation. I made this project to clean the surface of solar panels to maintain efficiency of the output power

Features

• ESP-NOW Communication: Low-power, peer-to-peer wireless data transfer between ESP32 devices.
• Blynk Integration: Remote monitoring and control via the Blynk mobile app.
• NTP Time Synchronization: Ensures time-based automation with accurate timestamps.
• UART Communication: Serial data transfer between ESP32 devices.
• Scheduled and Threshold-Based Actions: Automatically triggers devices based on preset conditions.

Components Used

• ESP32 (Multiple units for Master and Slaves)
• Blynk IoT Platform
• NTP Server for Time Synchronization
• Various Sensors (optional, e.g., temperature, motion sensors)
• Relays/Motors (optional, for actuation)

Code Structure

This project consists of four main ESP32 programs:

1. Master Node Code

• Connects to Wi-Fi and syncs time using NTP.
• Communicates with Blynk for remote control.
• Uses ESP-NOW to send control signals to slave nodes.
• Handles scheduling logic for automated actions.
• Supports manual triggering via Blynk Virtual Pins.

2. Slave Node Code

• Listens for commands from the Master via ESP-NOW.
• Controls connected peripherals (motors, LEDs, relays, etc.).
• Sends sensor data back to the Master for logging or further processing.

3. UART Communication Handler

• Manages serial communication between ESP32 units.
• Transmits sensor data and receives control commands.
• Used for temperature data retrieval and relay activation.

4. Blynk-Controlled Node

• Receives commands from the Blynk app.
• Sends control signals to the Master for execution.
• Handles remote data logging and device status updates.

How It Works

1. The Master ESP32 connects to Wi-Fi and Blynk, synchronizes time, and waits for input.
2. Scheduled tasks or Blynk commands trigger events.
3. The Master sends commands to Slave ESP32 nodes using ESP-NOW.
4. Slaves execute actions like turning on motors or collecting sensor data.
5. If needed, data is sent back to the Master via ESP-NOW or UART.
6. The Master updates Blynk with the latest status and sensor readings.

Setup Instructions

1. Install the necessary Arduino libraries:
   • WiFi.h
   • BlynkSimpleEsp32.h
   • ESP-NOW
   • NTPClient.h
2. Flash the Master Code to one ESP32 unit.
3. Flash the Slave Code to other ESP32 units.
4. Set up a Blynk project and link it with your ESP32.
5. Power up the devices and monitor data in Blynk.

Troubleshooting

• ESP-NOW Communication Failure? Ensure all ESP32 nodes have the same Wi-Fi channel.
• No Data on Blynk? Double-check your Blynk Auth Token and Wi-Fi credentials.
• Timing Issues? Verify that NTP synchronization is working correctly.

Future Improvements

• Add MQTT for cloud-based data logging.
• Implement Deep Sleep Mode for power efficiency.
• Enhance security with AES encryption for ESP-NOW messages.

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Contributors

• Alan Gabriel, alangabriel071@gmail.com, https://www.linkedin.com/in/alan-gabriel-2021b1219/