RachelAnne2020 Posted September 11, 2021 Report Posted September 11, 2021 I connect pin 1 to +5V and pin 2 to the I/O port P1.0 of the microcontroller. Why no matter whether the value of P1.0 is 1 or 0, pins 3 and 4 of the optocoupler are not connected (measured by a multimeter)?
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