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danielkucera / esp-arduino-ebus

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UART programming fails, RXD pulled low by opamp #27

Closed bakadave closed 1 year ago

bakadave commented 1 year ago

Hello!

If powered from the programming headers I could not transmit data to the MCU with an FT232 USB<->UART adapter due to RXD line being pulled low through R13. I haven't tried pulling TP1 up to 3V3 that might work in a pinch.

danielkucera commented 1 year ago

That's right, this is a small flaw but there are some USB-TTL adapters with strong pull which work. I have one chinese but it has no markings so I cannot tell you the exact type.

bakadave commented 1 year ago

Yep TP1 to 3V3 seemed to do the trick. (Although I am using 470R for R13 because that's the lowest I had.) May I suggest updating the Readme?