R REIFENG 6pcs/lot 1 Channel 12V Relay Module Board Shield with Optocoupler Isolation Support High/Low Level Trigger for Arduino
Product ID: 507270851
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What are the dimensions of one module. I’m very interested in the height.
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Can you trigger this with 3v dc?
What does the "high" and "low" level trigger mean: is it when the trigger voltage is applied vs. if it's grounded?
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