ESP8266 Community Forum

- Tue Feb 01, 2022 12:48 am #93525 I'm a new member!
I have a ESP8266 WsMOS D1 module:-
https://www.iotstarters.com/coding-the- ... duino-ide/

Unlike almost everybody here I would like to interface it directly through the UART Rx and Tx pins.
Hitting the reset always seem to return garbage indication I don't have the correct baud rate
I see numbers all over the map on web sites as to the default baud rate. None seem to work for me.
Two questions:-

1. What is the correct baud rate for this module (right out of the box - unaltered).
2. With a power input of 5V can I run Rx and Tx from a 5v supply UART (Z8035)

Thanks in advance for help
John Monahan

- Wed Feb 02, 2022 1:35 am #93536 there is no default baud rate.
the boot log is at 74880 baud. (the bootloader uses 115200, but it expects 40 MHz crystal. most esp8266 boards have 26 MHz crystal so the resulting UART speed is the strange 74880 baud)

- Thu Feb 03, 2022 8:58 am #93551 1)Here you can find some info regarding the baud rate :
https://www.sigmdel.ca/michel/program/m ... cu_en.html
2) Not sure. What is Z8035? Is it an USB to UART module?

- Thu Feb 03, 2022 5:38 pm #93553

What is Z8035?

From Byte Magazine JUNE 1984 VOL. 9, NO. 6 we find that the Z8035 is a "Counter/Timer & Parallel I/O Unit", presuably a Z80 microprcessor support chip.
Please tell me you are not trying to use one of these!
I suspect what you may be using is the Z80 Dual UART, or is it the Z80 SIO?
Either way very old tech!