CONNECTORS Raspberry Pi GPIO interface: for connecting Raspberry Pi Relay screw terminal: for connecting target devices Relays Photocoupler: PC817 Relay indicator LED on: relay NC is opened, NO is closed LED off: relay NC is closed, NO is opened Power indicator Relay control jumper short the jumper: control the relays by default I/Os used in the example code open the jumper: control the relays by custom I/Os through jumper wires WHAT'S IN THE PACKAGE 1 x Raspberry Pi power relay board
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