Re: RS485 support
Posted:
Wed Feb 04, 2015 4:49 pmby kartman
just use an inverter or chose a gpio that isn't also a boot option.
Re: RS485 support
Posted:
Wed May 06, 2015 3:59 amby andi
I know this is already an old topic, just want to share:
I also tried the hardware serial and some timing tricks, but finally I had need for more than one UART.
I wrote a small library to use any GPIO-Port for RS485.
Maybe you can use it (pull requests are very welcome!)
https://github.com/plieningerweb/esp8266-software-uart
Re: RS485 support
Posted:
Thu May 28, 2015 9:45 amby Aledav
Congratulations for the great work you have done.
My project is to create a low cost web server ESP8266 (lua) which implements the functions of SDM120c Modbus RTU and allow the reading of the electrical parameters Kwh, V, A, PF, Hz, W etc.
The schematic that attach do you think it can work?
I do not know whether you need to lower the 3.7V to 3.3V.
P.S. Pardon my bad English.
Re: RS485 support
Posted:
Fri May 29, 2015 6:38 amby andi
Hey,
I think it can work. The max 485 can handle to to 5v, and also 3.3v would not really be a problem. I do not know if the esp8266 is compatible with 3.7v or sometimes even more for li ion batteries.
Apart from that, my library is not included in nodemcu (the lua firmware). It is only a plain c library.