Is this relay module compatible with 3.3V microcontrollers like ESP8266, ESP32, or STM32?

The relay coil requires a 5V supply (VCC pin), but the signal/trigger pin is compatible with 3.3V logic levels from ESP8266, ESP32, and STM32 boards. Simply power VCC from a 5V source and connect the IN pin directly to your 3.3V GPIO — the optocoupler handles the logic level difference without any additional components.

What is the difference between high-level and low-level trigger modes, and how do I switch between them?

In high-level trigger mode the relay activates when the IN pin receives a HIGH (logic 1) signal, while in low-level trigger mode it activates on a LOW (logic 0) signal. This module supports both modes natively — simply send the appropriate signal from your code. No hardware jumper change is needed; the optocoupler circuit responds to either polarity depending on how you wire and program your MCU.

Can I use this module to control 230V AC Indian mains appliances like a fan or a bulb?

Yes. The relay is rated for AC 250V / 10A, which comfortably covers Indian 230V mains loads up to approximately 2300W. Always ensure your wiring follows proper electrical safety practices — use appropriately rated wire, insulate all AC terminals, and never exceed the 10A current rating to avoid overheating the relay contacts.

Does the optocoupler provide complete isolation between the Arduino side and the AC load side?

Yes. The onboard optocoupler (typically a PC817 or equivalent) provides galvanic isolation between the low-voltage control circuit (Arduino/MCU side) and the relay coil driver, protecting your microcontroller from back-EMF and voltage transients generated by inductive or high-power loads. This makes the module significantly safer than bare relay boards with no isolation.

What is the operating current draw of this module, and will it work directly from an Arduino's 5V pin?

The relay coil typically draws 60–80 mA when energised. Arduino Uno's onboard 5V regulator can supply up to 500 mA total, so powering one relay module directly from the Arduino 5V pin is generally fine for bench testing. However, for production builds or when running multiple modules, it is recommended to use an external 5V power supply to avoid brownouts on the Arduino.

1 Channel Relay Module Shield with Optocoupler – 5V High/Low Level Trigger

1 Channel Relay Module Shield with Optocoupler – 5V High/Low Level Trigger

Name: 1 Channel Relay Module Shield with Optocoupler – 5V High/Low Level Trigger
Brand: amiciKart
SKU: 1xHIGH-LOW-PCB-1
Price: 279.00 INR
Availability: InStock

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Rs. 279.00

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Stop worrying about voltage spikes frying your microcontroller — the 1 Channel Relay Module with Optocoupler gives your Arduino, ESP8266, or Raspberry Pi a safe, reliable way to switch high-power devices with a single signal line.

This compact relay module operates on a 5V supply and supports both high-level and low-level trigger modes, making it universally compatible with virtually any microcontroller or development board you already own. The built-in optocoupler creates a complete electrical barrier between your control circuit and the load side, so voltage spikes from motors, solenoids, or AC appliances never reach your precious MCU. With a max load rating of AC 250V/10A and DC 30V/10A, you can confidently switch everything from LED strips and fans to pumps and home automation relays.

Designed for makers, students, and professional prototypers alike, this module slots straight into your breadboard or project enclosure without any additional components. Whether you are building a smart home switch, an automated irrigation controller, or an industrial prototype, the plug-and-play screw terminals and standard 3-pin header make wiring fast and foolproof. The status LED gives you instant visual feedback on relay state — no guesswork during debugging.

Sold by amiciKart, a trusted electronics components vendor based in Noida. Order before 2 PM for same-day dispatch. Free shipping all across India, COD available, and backed by a 30-day easy return policy — zero risk to try it in your next build.

Stay protected from voltage spikes – Built-in optocoupler provides electrical isolation between your microcontroller and high-power load, safeguarding your Arduino, ESP8266, ESP32, or Raspberry Pi from damage
Control any device, any circuit – Supports both HIGH and LOW level trigger modes (5V logic), making it universally compatible with virtually any MCU or microcontroller project without extra configuration
Switch heavy appliances safely – Rated for AC 250V/10A and DC 30V/10A, this relay module can control lights, fans, motors, pumps, and other high-power appliances with confidence
Plug-and-play simplicity – Designed for seamless integration with Arduino, ESP8266, ESP32, and Raspberry Pi; no complex wiring or additional components needed, ideal for beginners and professionals alike
Compact & space-saving design – Slim relay board fits easily into tight enclosures and project boxes, perfect for home automation, industrial prototypes, and DIY electronics builds
Shop with complete confidence – Backed by amiciKart's 30-day easy returns (no questions asked), FREE pan-India shipping, same-day dispatch for orders before 2 PM, and COD available at checkout

Description

amiciSmart 1 Channel 5V Relay Module lets you easily automate and control devices like lights and motors. It supports high and low level triggers for flexible use and features a built-in optocoupler for safe, reliable operation. Compact and easy to integrate with Arduino, it’s perfect for DIY and automation projects, handling up to AC 250V/10A and DC 30V/10A.
Specifications:

Working Voltage: 5V

Static Current: 5mA

Trigger Voltage: 3–5V

Maximum Load: AC 250V/10A, DC 30V/10A

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