Making a DIY Optocoupler
instructables.com
Making a DIY Optocoupler
Making a DIY Optocoupler: When I was working on my garage door opener, I had trouble controlling a 12V relay from a 3.3V NodeMCU board and at the time, I did not have any optocouplers available. Hence, I had to resort to using a 5V relay. While looking at what I could do, I…
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