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Re: What would I need to enable flashing to a ESP32-WROOM-32

Posted: Fri Feb 14, 2020 12:02 am
by jimhelios
Sorry to bump an old thread, but I don't understand the circuit posted by username. It seems if RTS is brought low, then EN will be pulled low through the transistor, but GPIO will remain pulled high because that transistor is now off. If DTR is brought low then GPIO_0 is pulled low as long as RTS is high. But if RTS is high then GPIO_0 can not go low.

So how does this circuit pull both EN and GPIO_0 low at the same time? I'm sure I'm missing it, if someone could explain I would appreciate it. The circuit with the manual buttons is very clear.