Relay controller

500+
Downloads
Content rating
Everyone
Screenshot image
Screenshot image
Screenshot image

About this app

Relay Controller lets you control USB relay devices directly from your Android phone using a USB OTG cable.
No PC, no Raspberry Pi, and no programming required.

⚠️ USB relay hardware is required. This app is intended for users who work with USB relay modules.

Features

• Direct local control of USB relay devices via USB OTG
• Real-time monitoring and switching of relay states
• Optional remote control without cloud services

Remote control

You can control your USB relay remotely by pairing another device.
Pairing is simple — just scan a QR code or enter a short access code.

The remote device does not need to install any app.
It works instantly in any modern web browser, including:
iPhone, iPad, Android devices, PC, Mac, or tablets.
Updated on
Feb 22, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Committed to follow the Play Families Policy

What’s new

Add relay image