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Add-on Board: 4 Reed Relays, 500mA Normally Open, Stackable US$29.00

Add-on Board: 4 Reed Relays, 500mA Normally Open, Stackable

RELAY-4REED has four sub-miniature relays with low power coil consumption. Switch current is 0.5A. Carry current is 1.25A. All relays have normally open contact. Two relay terminal blocks provide all the relay contacts. A Philips I/O expander PCF8574 controls the relays. Any command to activate or deactivate any relay can be sent through the I2C bus. There is a configuration selector that allows you to set three hardware address pins. Thus you can chain together up to eight boards at the same time for a total of 32 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.

Reed Relay Peripheral Board Features

  • Philips I/O expander PCF8574
  • 4 sub-miniature relays with normally open contact
  • 500mA per relay contact
  • Configuration selector
  • Terminal blocks for relay contacts
  • Up to 8 RELAY-4REED boards can be cascaded for a total of 32 relays

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.


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


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