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I think this problem is so interesting, I use PC817 like Datasheet, I connect pin 1 to a resistor 200 and a pin ( transmit PWM) from MCU, pin 2 to Ground, pin 3 to Power and a resistor 3K, pin 4 to Ground
Wow, it not work!
But If i add a diod to pin 1
It Work!
I Can't understand this problem...
When i connect pin 31 to pin 40 of 89C51 ,I got a DRC error in Ares and i can't find reason of that error.
Project file below (Proteus 7.8) please help me
Aha!, now, i knew why when I put Virtual terminal after max232, It show wrong data, and when I choose "Invert" in menu of virtual terminal, It show true data. Thank for help
(Have Project file below)
Like tile, I have some problem with Circiut have max232 and 89C51, transfer data over COM port (Simulation by Proteus 7.8 SP2 and Virtual Serial Port Driver 7.2 Trial)
According to circuit I saw at internet, pin 2 of COM connect to pin 14 of max232 and 3-13
(Rx-T1OUT...
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