5V 1 Channel H/L Level Trigger Optocoupler Relay Module For Arduino
Triggers fine from 3.3V (with a 5V power source)
Matthew Skill
Little Bird
5V 1 Channel H/L Level Trigger Optocoupler Relay Module For Arduino
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The 5V 1-Channel Optocoupler Relay Module provides safe, isolated switching of high-voltage loads from a microcontroller. An onboard SMD optocoupler isolates...
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The 5V 1-Channel Optocoupler Relay Module provides safe, isolated switching of high-voltage loads from a microcontroller. An onboard SMD optocoupler isolates the control circuit from the relay, protecting your Arduino, Raspberry Pi, or other development board from voltage spikes.
A jumper setting lets you select either high-level or low-level trigger, giving you flexibility to match your project's logic. A fault-tolerant design ensures the relay remains off if the control line is disconnected.
Key Features
- Optocoupler Isolation – SMD optocoupler separates control and load circuits for safety
- Selectable Trigger Level – Jumper to choose high or low level trigger
- Fault-Tolerant Design – Relay stays off if control line is disconnected
- LED Indicators – Green power LED and red relay status LED
- Maximum Load – AC 250V/10A or DC 30V/10A
- Trigger Current – 5mA
- Mounting – Four 3.1mm bolt holes for secure installation
- Compact Size – 50 × 26 × 18.5mm
Pin Connections
- DC+ – Positive power supply (VCC, 5V)
- DC− – Negative power supply (GND)
- IN – Control signal input (high or low level)
- NO – Normally open relay output
- COM – Common relay output
- NC – Normally closed relay output
Ideal For
- Home automation and IoT switching
- Arduino and Raspberry Pi projects requiring mains-voltage control
- Controlling lights, fans, pumps, and solenoids
- Industrial control prototyping
Package Contents
- 1× 5V 1-Channel H/L Level Trigger Optocoupler Relay Module
Warning: This module switches mains voltage. Ensure all high-voltage wiring is performed by a qualified person and that connections are properly insulated.
Need more channels? See also the 2-Channel, 4-Channel, 8-Channel, and 16-Channel relay modules, or the Gravity Easy Relay Module for a simpler interface.
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- Relay module
- A relay module uses an electrically controlled switch to let a low-power microcontroller control a separate circuit. It matters when switching devices that need different voltages or more current than a microcontroller pin can safely handle.
- SMD
- SMD means surface-mount device, a component style designed to be soldered directly onto the surface of a circuit board rather than through holes. SMD parts are compact and mounted flat on the board, which suits smaller and mass-produced designs.
- VCC
- VCC is the positive power-supply connection on a chip or module. Connecting it to the correct supply voltage is needed for the part to power on and helps avoid damaging the electronics.
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