LinuxGizmos.com Stackable 8-relay add-on supports up to 64 relays per Raspberry Pi LinuxGizmos.com Sequent Microsystems has gone to Kickstarter to launch a “ Raspberry Pi 8-Relay Card,” a more-focused version of last fall's successfully Kickstarted Raspberry Pi Mega-IO Expansion Card.
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Stackable 8-relay add-on supports up to 64 relays per Raspberry Pi – LinuxGizmos.com