There are 5V, 12V, or 24V relay options on the bottom of this page. The default relays shipped with this product are 5V.

Description

Powered by the ULN2003 high current driver, this module gives you easy control of up to 7 relays using TTL logic from an Arduino, Beagle Bone, or Raspberry Pi. 5V, 12V, and 24V relay options.

Hookup

• Vcc: Coil Voltage (if you are using a 24V coil, hook 24V up here, its what powers the coil and pulls in the contact)
• In: (7 Inputs) TTL input from microcontroller (can be 3.3V or 5V input, it will be what causes the coil to pull in)
• GND: Ground. This must be a common ground with the TTL in and the Coil Vcc power.

• COM: (7 outputs) Common side of relay contact. Acts as a switch. Rated at relay ampacity.
• NO: (7 outputs) "Normally Open" side of relay contacts. Acts as a switch. Normally Open. When coil is energized, the contact will change state and close. Rated at relay ampacity.
• NC: (7 outputs) "Normally Closed" side of relay contacts. Acts as a switch. Normally Closed. When coil is energized, the contact will change state and open. Rated at relay ampacity.
• Currently the NO and NC labels on this board's outputs are reversed. This will be fixed in a future iteration.

Features and Specifications

• Relay control is simple TTL level digital signals.
• 7 DPDT output relays.
• Signal and power indicator LEDs

• Relay Coil Voltage: 5V, 12V, or 24V (select in options below).
• Relays: 7
• Relay Type: SPDT

Documentation and Support

• Schematic
• Diagram