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5V 1-Channel Relay Module

Relay

Single-relay module that switches separately powered loads such as a lamp, fan, pump or lock on and off from a small Arduino or ESP32 signal. The load goes between COM and NO (normally open) or NC (normally closed). WARNING: 220V mains voltage can kill. While learning, work with low-voltage loads such as 12V; if it is wired to mains, the circuit must be in a closed, insulated enclosure, the underside of the board must never be touched, the wiring should be done by someone qualified, and only with the power off. Because of the board's traces, do not switch more than a few amps in practice.

Specifications

Relay

SRD-05VDC-SL-C (5V coil, ~70 mA)

Contact rating

10A 250VAC / 10A 30VDC

Contacts

COM, NO (normally open), NC (normally closed)

Control pins

VCC (5V), GND, IN

Trigger

Active LOW or HIGH by model (some have a jumper)

Protection

Flyback diode, transistor driver (optocoupler on some models)

Indicators

Power and relay LEDs

Shop prices

• RobocomboIn stock30.00 ₺
• ElektrovadiIn stock33.07 ₺
• MotorobitIn stock35.35 ₺
• Robo90In stock35.71 ₺
• HobiDevreIn stock37.44 ₺
• RobotzadeIn stock42.00 ₺
• RobotsepetiIn stock45.72 ₺
• Robolink MarketIn stock48.00 ₺
• KomponentciIn stock49.62 ₺
• SAMM MarketIn stock53.58 ₺
• Direnc.netIn stock54.40 ₺
• Modül ElektronikIn stock59.64 ₺
• RobotistanIn stock61.05 ₺
• RobitshopIn stockPrice at the shop
• F1 DepoOut of stock64.80 ₺

Prices read from the shops' pages on 22 October 2026. Prices and stock may have changed since; check at the shop before you buy.

Projects with this part

• Automatic Plant WateringIntermediate50 minA system that waters a potted plant by itself once the soil dries out: the soil moisture sensor measures moisture as a percentage, and when it drops below 30% the Arduino runs the mini submersible pump for 3 seconds through a relay, waits for the water to soak in, measures again and repeats until moisture passes 50%. The pump runs on three AA batteries of its own; the relay keeps that circuit fully apart from the Arduino. If 5 waterings in a row leave the soil dry, the tank counts as empty and the pump is stopped so it never runs dry. It teaches calibrating a sensor into a percentage, switching a separately powered load with a relay, powering a sensor only while it reads to slow its corrosion, and guarding a system against faults. No extra library needed.Open project