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2 channel relay box
by Albebert
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a simple box for 2 channel relay from banggood :
https://www.banggood.com/5V-2-Channel-Relay-Module-Control-Board-With-Optocoupler-Protection-For-Arduino-p-1142262.html
https://www.banggood.com/5V-2-Channel-Relay-Module-Control-Board-With-Optocoupler-Protection-For-Arduino-p-1142262.html
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