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ok! thanks for your reply!! i will go with the optocopler in the next board, definitely!
i allready have a circuit that doesn't work for what you say... i cant modify the circuit... it has a bc548... some quick fix? a pulldown resistor will work??
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excelent!!! it work's!!! super cheap and easy to buil, tons of fun.now the upgrade... replacing control board to esp8266 module!!!! soon...
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