Temperature measurement in the sauna v2.0

The second version of the project already described here, in the portfolio. It is a microcontroller device that measures the temperature of the air in the sauna rooms and transmits data to the server on the Internet. Unlike the first version of the device, the K-type thermopars are used as temperature sensors, which resist much higher temperatures than the DS18B20 sensors used in the first version. Each thermopar is connected to its microcontroller, which in turn is connected to the main microcontroller through the RS485 interface and the ModBus RTU protocol.
The main controller sends the data to the WEB server to the Internet through the Ethernet interface.