I designed this relay board for maximum reliability. It can be used with my 16-Relay control board found HERE for Raspberry Pi or stand-alone.

It uses a simple control method to activate relays. Just pull the channel pins to ground (sink-current ~1.75ma) to activate the relays and allow the pins to float or set them to HIGH to deactivate.

FEATURES

• Supports 3.3v or 5v control logic (microcontroller or single-board computer must have 5V power pin)
• Full optical isolation for all GPIO pins
• Can be externally powered to protect controlling device
• 2.1mm Barrel jack to allow powering relays separately from Raspberry Pi
• 2.5mm Screw terminal to allow powering relays separately from Raspberry Pi
• Jumper to allow selecting relay power source (Raspberry Pi / External)
• 2-ounce copper with wide traces for maximum current flow and heat reduction
• High-quality rising-cage screw terminals for each relay (accepts up to 12AWG wires)
• In-line 10A slow-blow fuses on all relay inputs to protect board and device being switched.
• Support keyed IDC connector for high-reliability connections
• LED indicator for both power rails
• LED indicator for each relay channel

MAX RATINGS

Resistive Loads:

• 10A/240VAC
• 10A/28VDC

Inductive Loads:

• 5A/120VAC
• 5A/28VDC

5V Current Draw:

• 5v@480ma when all relays activated
• > 2ma sink-current per control pin

Board ships full-assembled with 12-in 10-pin IDC cable with keyed connector