Usb cable for esp8266-01

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1

I have an old usb to serial cable would I be able to convert this to programme and esp8266-01 and also update the firmware
Th

2

Serial is serial. Almost any usb-to-serial will work.

HOWEVER, some serials use 5v logic and that could potentially damage your ESP since that has 3.3v logic. So I’d suggest spending a couple bucks and buy a 3.3v logic USB-to-serial adapter :slight_smile:

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3

I was going to use a separate 3.3v power supply for the esp8266 and connect the 2 grounds together
Thanks for the reply to my post
oldvolt

4

That’s not the point… a 5v powered sensor (or in this case USB to RS232 Serial cable) sends out a 5v signal… and ESP’s can NOT take any signal higher than 3.3v.

So your older USB-Serial cable will push 5v out on it’s TX, and kill the ESP’s RX pin, if not the whole thing.

5

Thanks I will look into doing it another way
oldvolt

6

I forgot to mention, a simple 2 resistor voltage divider for the Serial TX to the ESP RX will be all you need.

7

I was going to ask that question and I thought tof myself I would be askingredients yet another of my stupid questions
Thanks oldvolt

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