SainSmart Relay Boards
The Sainsmart relay boards enable computers to control multiple relay modules via a micro-controller or USB connection and software. A relay, when enabled, allows current to flow through a circuit that it is connected to. In virtual pinball builds, these are often used to control cabinet toys. The Sainsmart relay board can also be used with a LED-Wiz™ and/or an Ultimarc PAC Drive.
16-channel relay boards
One of SainSmart's relay boards is the 12V 16-Channel Relay interface board. It consists of 16 relay modules and each one needs 15-20mA Driver Current. It is equipped with high-current relays (AC250V 10A/DC30V 12A), and uses a standard electronic interface that can be controlled directly by a micro-controller such as an Arduino. There are colored indication LEDs for visual relay output status.
There is also a version of the 16-channel unit that can be controlled via USB.
8-channel relay boards
Another board is a smaller, USB controlled, 8-channel interface. It operates similarly to the 16-channel product mentioned above, but can be controlled via a USB connection and software.