cdj wrote: lots of time i see strange chars in serial output
I know nothing about Esp8266, but be aware that interrupts occurring during transmission can affect the serial data.
About adding transistors, I doubt it could be a solution in that case. They are slow and act as inverters.
Oh, I just see that you're referring to
, so your are talking about level shifter between a 5V powered Arduino and the 3.3V Esp8266. In that case the transistors are used as follower and they do not invert the signal but I'm not sure that 2N2222 is the best choice for .
Last edit: 6 years 7 months ago by Xavier. Reason: Saw the guide