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/i/787201/products/2023-01-16T22%3A08%3A46.225Z-24VAC-to-Arduino-RaspberryPi-BBB.JPG?1673878946 "24VAC Isolated Interface for Raspberry Pi Arduino from Concise Technologies Inc. on Tindie")
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Pi HAT with 16 opto-isolated inputs can stack for up to 128
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Optocouplers | Einhugur Tech Blog
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Using Optocouplers with the Raspberry Pi - YouTube
Raspberry Pi Relay Module Expansion Board with Isolated Optocoupler – MakerFocus
