USB Host Relay board




KMtronic USB Host  Arduino compatible relay board


KMtronic USB Host  Arduino compatible relay board




Multifunctional 8 Relay board with USB Host interface. USB Host allo to connect to board and control relays using any ready USB Device like Bluetooth, Joystick, Keyboard, Remote control, Mouse, RFID Reader, HID devices or custom developed modules.

What is idea?
Build open source universal relay board with possibilities control using any ready or custom made USB device.



Technical Details

  • Arduino MEGA ADK compatible
  • ATmega2560 microcontroller
  • Flash Memory: 256 KB of which 8 KB used by bootloader
  • SRAM: 8 KB
  • EEPROM: 4 KB
  • Clock Speed: 16 MHz
  • USB Host Chip: MAX3421E
  • Required power: 12VDC/1500 mA
  • Outputs: 8 relays each capable of switching 12VDC/10A or 240VAC/7A. Each relay has an LED to indicate when it is operated.
  • Two collors functional LED (Green + Red)


Relays specifications:
Relays has Normally Open (NO) and Normally Closed (NC) Contacts rated for voltages:
- 12VDC/10A
- 24VDC/10A
- 125VAC/10A
- 250VAC/7A


After test examples "USB Host Library for Arduino" Lauszus (TKJElectronics) and Oleg Mazurov we just successfully control relays using:

USB Keyboard

USB Mouse

USB Joystick

USB Bluetooth

USB Remote control


Now try to expand examples with many more USB devices like:

USB WIFI module

USB 3G Module

Android USB Control

USB DS1820 Temperature reader

Custom USB Modules


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