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 (2×10) 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.