relay 5v arduino

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questa è la scheda relay che ho acquistato, però pin di controllo dei relè funzionano se massa.
cioè se collego massa uno dei pin il relè si eccita.

però come faccio con arduino impostare un pin su massa???

facile, sai che devi lasciare high il pin e per eccitare il rele lo mandi low ;) e' all'opposto ma per arduino non fa differenza


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