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Well, I've no checked with a multimeter the outputs, but just connecting Arduino UNO (Low cost imitation) to 8-Relay Board, it stands all onboard smd red Leds light on, and when I select switches ('A' position ), selected ones turns off smd Led!
hey! I'm trying it as first Arduino project, an it's working at first tests! Thank's for the work and sharing knowledge!in order to solve some aspects, why are the relays initialy open? onboard Led relays are HIGH!