Wemos D1 Recieve and Transmit, how?

[javrolijk]

Hi folks,

I have a question related to the picture below. I also have two Wemos D1 boards but not quite understanding how to send data between these two boards. Do I need to connect a wire on the TX on one board to RX to the other board?

This is a very great project, thanks Tim and others. 👍

Thanks in advance for your help.

Jairo

[timmbogner]

Thanks!

Yep, you have it right. You'll want to connect the TX pin of one device to the Rx pin of a second device,.

ESP8266 doesn't have multiple serial ports, so you should disable serial debugging messages (FDRS_DEBUG) on any devices that send serial data as well.

[javrolijk]

Thank you very much Tim. Works as it should, I will start a discussion on another topic.

[svdrummer]

Incase you have them both running on thier own batteries, you also need a common ground/negative/0volt or whatever.

…

On Mon, 15 Aug 2022, 10:00 am Timm Bogner, ***@***.***> wrote: Thanks! Yep, you have it right. You'll want to connect the TX pin of one device to the Rx pin of a second device, and also make sure that you have a common ground line between the two devices. ESP8266 doesn't have multiple serial ports, so you should disable serial debugging messages (FDRS_DEBUG) on any devices that send serial data as well. — Reply to this email directly, view it on GitHub <#95 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJ7LPAZBRVMUKBXEQMP7LELVZGCBJANCNFSM56QTBNVA> . You are receiving this because you are subscribed to this thread.Message ID: <timmbogner/Farm-Data-Relay-System/repo-discussions/95/comments/3394760@ github.com>

[dtuando]

Quick question why not use one board as the gateway. I have used one board in a similar project I've done in the past. It can communicate with esp-now using the AP Mac address and still connect to the internet via STA Mac address?

[timmbogner]

When an ESP connects to a WiFi access point, it switches the radio to the channel of the the AP. This also changes the channel that ESP-NOW is running on, but doesn't change the channel that the rest of the devices are on. Sometimes this doesn't cause problems, but often it does.