ESP8266 Community Forum

- Mon Jun 12, 2017 11:39 pm #67080 I working on a project that I want to have communication from 1 master ESP8266 (currently using a Wemos) to many arduinos. I have used in the past https://github.com/MajenkoLibraries/ICSC library from 1 to many arduinos with no problems. The issue I have is with the DE/RE pin on the rs-485 module. The ESP will not receive data from another arudino but will not send unless I remove the conection from the ESP to the rs-485 (the module has built in pull-up) so the chip in in high state and will send data but now will not receive.

I know the pin is going high by testing with a led and getting a quick strobe i've tried 3v3, 5v and no luck.

- Wed Jun 14, 2017 10:28 am #67163 Are you providing the right DE pin number to the ICSC constructor ?
Is your RS485 module powered with 3.3V or 5V ?
If 5V, you will need some voltage level translators.

- Sun Jun 18, 2017 8:17 am #67309 Just after I posted this I figured it out, I added a 1 msec delay before de/re pin goes low