5V Relay Module Remote Wifi Switch (ARD350)

A 5V Relay Module Remote WiFi Switch is a smart control system that lets you switch electrical devices ON/OFF remotely using WiFi (usually via a phone app or web interface).

It combines two main parts:

• Relay module (5V control side)
• WiFi controller (usually ESP8266 or ESP32 based)

What it does

It allows you to control high-voltage or high-current devices like:

•  Lights
•  Small appliances
•  Heaters (within relay rating)
•  Fans
•  Power sockets (DIY smart plug setups)

All controlled from your phone or network.

How it works

1. Your phone sends a command over WiFi
2. The WiFi module (ESP8266/ESP32) receives it
3. It triggers the 5V relay coil
4. The relay physically switches the high-voltage circuit ON/OFF

So the low-voltage WiFi side is safely isolated from the mains side (when built correctly).

 Typical specifications

• Input voltage: 5V DC
• Relay channels: 1 / 2 / 4 / 8 channel versions
• Relay rating: usually 10A @ 250V AC (check actual marking)
• Control chip: ESP8266 / ESP32 (most common)
• Control method: WiFi (2.4GHz)
• App support: commonly Tuya / Smart Life or custom firmware

 App control

Many modules use cloud apps like:

• Tuya Smart
• Smart Life (very similar ecosystem)

Features usually include:

• Remote ON/OFF
• Timer scheduling
• Countdown function
• Voice control (Alexa / Google Home integration)

 Wiring basics

Low-voltage side:

• 5V power → module VCC
• GND → ground
• WiFi handles control logic

High-voltage side:

• Live wire goes through relay COM → NO terminal
• Load connects to output side

Only switch the LIVE wire, not neutral.

 Important safety notes

•  Mains voltage (220–240V in South Africa) is dangerous
•  Enclosure is required (no exposed terminals)
•  Do not exceed relay rating (10A is often optimistic)
•  Not suitable for high inrush loads (large motors, compressors) unless properly rated

When to use it

Good for:

• Smart home DIY projects
• Remote switching of lights or small appliances
• Automation systems
• IoT learning projects

When NOT to use it

Avoid for:

• High-power geysers or ovens (unless properly rated relay/contactor used)
• Industrial motors
• Safety-critical systems