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- All products are tax-inclusive.
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The OpenELAB relay shield has integrated a 4-channel 5V relay module, which is fully compatible with the UNO R3 control board. The 4-channel relay on the shield is active at HIGH level. Separately connect the 4-channel relay to the digital port 4, 5, 6, 7 on the UNO R3 board, then through controlling output HIGH or LOW to control the relay on and off.
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