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Add-on Board: 4 Power Relays, 4 Extra Digital I/O, Stackable US$39.00

RELAY-4
Add-on Board: 4 Power Relays, 4 Extra Digital I/O, Stackable

RELAY-4 is an Input/Output Expander board containing four relays with 10A contact rating. Both Normally Open (NO) and Normally Closed (NC) relay contacts are brought to screw terminals. Relays are controlled by a Philips PCA9554N I/O Expander. Any command to activate or deactivate a relay is sent through the 2-wire (I2C) bus. A jumper block configures a unique 3-bit board address. This allows up to eight RELAY-4 boards to be used at the same time. Thus, it is possible to prepare a controller system with 32 high-current relays.

The 16 control pins and 5V power supply connections are available on a 20-pin (210) expansion connector for interfacing to existing microcontroller systems. This board can be connected either as a piggyback daughterboard on a microcontroller board (one with a matching connector) using standoffs or can be placed away from the microcontroller board using a 20-wire ribbon cable.

The expansion connector is plug-in compatible with MicroTRAK, MINI-MAX and BSCB systems. You can use it in your own system too, of course; see the manual for the expansion connector's pinout.

Note: Do not confuse this board with the other board we carry called Relay 4, from a different manufacturer.

Relay Peripheral Board Features

  • I2C (2-wire) I/O expander PCA9554N
  • 4-channel Darlington drivers (ULN2803) to drive the relay coils
  • 4 high-current (10A) relays with Normally Open and Normally Closed contacts
  • 4 extra digital I/O
  • Address selector jumpers allow stacking up to 8 boards for 32 relays
  • Screw terminal blocks for relay contacts
  • 20-pin connector for interfacing to a microcontroller board
  • Single operating voltage 5V DC, 75mA per energized relay coil
  • Dimensions: 2.35 2.40 inches (5.97 6.10 cm)
  • -20 to 85 C operating, -40 to +85 C storage temperature range

If you want to chain multiple add-on boards together, you can purchase cable and connectors separately to construct daisy-chain cables that suit your setup.

Documentation


This product was added to our catalog on Friday 14 November, 2008.

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