Please measure old module pin header spacing and relay board dimensions with caliper before ordering. I2C address selectable via jumpers, controls 1 to 16 SPDT relays using only 2 wires. Package includes 1 module with screw terminals for loads and 2.54mm control header. Optocoupler isolates control logic from relay contacts, each relay rated 10A 250V. DIY home automation, connect SDA/SCL to Arduino or Pi, use library to toggle relays individually.
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