Comments on: XY-MD02 Temperature and Humidity Sensor https://www.epanorama.net/blog/2024/02/28/xy-md02-temperature-and-humidity-sensor/ All about electronics and circuit design Sat, 18 Apr 2026 21:44:05 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2024/02/28/xy-md02-temperature-and-humidity-sensor/comment-page-1/#comment-1841904 Thu, 19 Dec 2024 07:38:10 +0000 https://www.epanorama.net/newepa/?p=195521#comment-1841904 ESP8266 as a Modbus Slave Over RS485: Temperature Monitoring Made Easy!
https://www.youtube.com/watch?v=U65CGwY-6y0

Learn how to transform an ESP8266 into a Modbus slave for RS485 serial communication! In this video, I’ll walk you through configuring ESPHome to read multiple Dallas temperature sensors and send their data over RS485. I’ll also explain how RS485 works, why it’s essential for secure and reliable wired communication, and how you can use this setup for industrial or home automation systems.

]]> By: Jim https://www.epanorama.net/blog/2024/02/28/xy-md02-temperature-and-humidity-sensor/comment-page-1/#comment-1838284 Sat, 26 Oct 2024 21:07:39 +0000 https://www.epanorama.net/newepa/?p=195521#comment-1838284 I have a few of these XY-MD02 sensors and have been able to read the temp and humidity from both modbus with NodeRed (node-red-contrib-modbus) and using UART with minicom. In modbus I was not able read anything from the 3 register at all. I polled all the way up to address 1000 on both 3 and 4 and the only data I got back was for temp and humidity.

In UART I can read and change the temp and humidity correction, enable and disable polling and the rate.

The issue I am facing now is that UART does not appear to allow for changing the units address away from default one, and modbus should support it, but appears not to. As such, I cannot change the modbus address and this means I cannot attach multiple sensors to the same RS485 wire.

Any suggestions?

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