Biggest Home IOT Project making At Home 16 CH NodeMCU ESP32 Project

 Biggest Home IOT Project making At Home 16 CH NodeMCU ESP32 Project

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If you're looking to build a versatile IoT device capable of controlling up to 16 appliances or devices via your smartphone, then you're in the right place. In this tutorial, we’ll create a 16-channel relay module controlled using an ESP32 WROOM module and the RemoteXY platform. This setup is perfect for home automation projects. Let’s dive in!

What You’ll Need

Hardware Components

• ESP32 WROOM Module
• 5V 16-Channel Relay Module
• 16 x 1N4007 Diodes (flyback protection)
• 16 x 330Ω Resistors (for base current limiting)
• 16 x BC547 Transistors (relay drivers)
• 16 x AC Terminal Blocks (load connections)
• 5V Power Supply Socket
• Connecting Wires

Software Tools

• RemoteXY (to create a smartphone app interface)
• Arduino IDE (to program the ESP32)
• PCB Design Tool (e.g., KiCAD, Eagle, or EasyEDA)
• PCBWay (to order professionally made PCBs)

Step 1: Circuit Explanation

Let’s break down the key parts of the circuit:

1. Relay Control Circuit

• Each relay is connected to a BC547 transistor.
• The ESP32 GPIO pins control the transistor’s base through a 330Ω resistor.
• When the GPIO pin is HIGH, the transistor switches ON, activating the relay.
• A 1N4007 diode is placed across each relay coil to protect the circuit from voltage spikes when the relay switches OFF.

2. Power Supply

• The ESP32 and relay module operate on a 5V supply.
• Make sure to use a power source capable of supplying sufficient current (~2A) to drive all relays simultaneously.

3. ESP32 Pin Configuration

• Assign GPIO pins to control each relay (e.g., GPIO16, GPIO17, GPIO18, etc.).
• Connect the ESP32 GND to the relay module GND to ensure proper signaling.

Below is a simplified schematic to help you visualize the connections:

Step 2: PCB Design

For a reliable and professional build, it’s best to design a custom PCB that integrates the ESP32, relay module, transistors, and other components. Follow these steps to design the PCB:

1. Create the PCB Layout

Use tools like KiCAD, Eagle, or EasyEDA to design your PCB:

• ESP32 Placement: Place the ESP32 WROOM module in a central position.
• Relay Driver Circuit: Arrange the transistors, diodes, and resistors neatly in a grid for the 16 relays.
• Power Lines: Add thick traces for 5V and GND to handle current flow for all relays.
• Connector Terminals: Add terminal blocks for AC load connections and the 5V power input.

2. Export Gerber Files

Once your PCB design is complete:

1. Double-check the design for errors (e.g., missing connections or incorrect traces).
2. Generate Gerber files, the industry-standard format for PCB manufacturing.

Step 3: Order Your PCB from PCBWay

PCBWay is a reliable platform for high-quality PCB manufacturing.

Steps to Order:

1. Visit PCBWay:
   • Go to PCBWay’s website.
2. Upload Gerber Files:
   • Click "Quote Now" and upload the Gerber files exported from your PCB design software.
3. Choose Specifications:
   • For this project, a 2-layer PCB with standard thickness and copper weight is sufficient.
4. Place the Order:
   • After selecting specifications and uploading files, proceed with the payment.
5. Receive Your PCB:
   • PCBWay delivers PCBs quickly with professional finishes. Once received, solder the components onto the PCB.

Step 4: Build and Upload Code

1. Assemble the PCB

• Solder all components (relays, transistors, resistors, diodes, and ESP32) onto the PCB.
• Use a heat sink for components that may dissipate heat, especially for the power supply.

2. Upload the Code

• Use the Arduino IDE to upload the code to the ESP32.
• The code generated by RemoteXY is already optimized for your designed smartphone interface.

3. Test Your Device

• Connect the 5V power supply and verify that all relays switch on and off correctly using the smartphone app.

Step 5: Control with RemoteXY

1. Open the RemoteXY app on your smartphone.
2. Pair the app with your ESP32 module via WiFi or Bluetooth.
3. Start toggling buttons in the app to control the relays.

Video Reference

https://www.pcbway.com/?from=technology4power
Every electronic device needs PCBs. Are you looking for the Best PCB order? PCBWay is one the best PCB manufacturing companies. Order 10 pcs PCB for only $5. Visit now https://www.pcbway.com/?from=technology4power
💡 PCBWay 7th Project Design Contest: https://www.pcbway.com/activity/7th-project-design-contest.html

Conclusion

By following this guide, you’ve built a 16-channel IoT control system with professional PCB design. Using platforms like RemoteXY and PCBWay, you’ve created a reliable and scalable solution for home automation or industrial control. This method ensures not only functionality but also durability and ease of assembly.

Take your IoT projects to the next level by leveraging professional PCB design and robust IoT platforms like RemoteXY!

Happy Building! 🎉