Dcttech usbrelay

dcttech.com USBRelay<n>

Status	supported
Source code	dcttech-usbrelay
Channels	up to 8
Ratings	10A 250VAC / 10A 30VDC
Connectivity	USB HID

The dcttech.com USBRelay<n> is a USB relay card with up to 8 relays (models with 1, 2, 4, or 8 relays exist). The firmware is based on V-USB and presents itself as USB HID to the PC (so that no driver installation is required on Windows).

See Info for USB details.

Photos

• 

  USBRelay2 top, ATtiny45, discrete transistors

• 

  USBRelay2 bottom

• 

  USBRelay4 top, ATmega8A, ULN2803, external supply for relays

• 

  USBRelay4 bottom

• 

  USBRelay8, DIY with Nanite841 and ULN2803

Example use

Detect the device and display its properties.

 $ sigrok-cli -d dcttech-usbrelay --scan
 The following devices were found:
 dcttech-usbrelay:conn=/dev/hidraw2 - www.dcttech.com USBRelay4 [S/N: 12345]

 $ sigrok-cli -d dcttech-usbrelay --show
 Driver functions:
     Multiplexer
 Scan options:
     conn
 dcttech-usbrelay:conn=/dev/hidraw2 - www.dcttech.com USBRelay4 [S/N: 12345]
 Channel groups:
     R1: channel
     R2: channel
     R3: channel
     R4: channel
 Supported configuration options across all channel groups:
     conn: /dev/hidraw2 (current)
     enabled: on, off

Display the relay state.

 $ sigrok-cli -d dcttech-usbrelay --get channel_group=R1:enabled --get channel_group=R2:enabled --get channel_group=R3:enabled --get channel_group=R4:enabled
 true
 false
 false
 true

Manipulate the state of relays.

 $ sigrok-cli -d dcttech-usbrelay --config channel_group=R1:enabled=off --config channel_group=R2:enabled=on --set

Resources

• V-USB project page, software bitbanging USB for AVR controllers that don't have native USB hardware support
• product description and source code repo of a private project that is not related to the vendor, implements OpenSource libraries and CLI and GUI applications to control these cards