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External Control of Sonoff relays

 Hi. I want to connect a 3.3v signal wire to R19 on the sonoff basic to turn on the relay. Pin 10, MTDI, PWM0 is used to turn on the relay normally. I'm afraid that as pin 10 is acting as an output that I might damage it by applying 3.3v to it. Will it damage the exp8266ex?


Regards

Dermot

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