<- Back to comparison

• Ethernet conectivity
• RS-485 or USB-C interface (share same serial and baudrate speed)
• Direct connection of TWO 1-wire thermistor DS18B20
• 11 GPIOs
• Mounting on DIN rail
• Expandable
• Arduino firmware
  
  
• Block diagram
  
  
  
  
  

1. Connect to the power or USB-C
2. Connect a serial console (115200 baud) to USB-C where you ask to IP address assigned from DHCP with press ? and enter.
   
3. Now you can configure the device via the web interface.
   

1. is available on GitHub release page (without label ESPhome).

The code is created for Arduino IDE and is compilable with these fixed settings

1. Arduino IDE version 1.8.19
2. Libraries according to the list, which are available for download on GitHub, commit b60a8cb
   1. just copy it to your /Arduino/libraries directory
3. Specifically commit Arduino ESP32 libraries

   cd ~/Arduino/hardware/espressif/esp32
   git clone https://github.com/espressif/arduino-esp32.git
   cd <repository-name>
   git checkout c2c8d189928386c872aa6cd7ba7a87c8019c5663

4. Firmware source available on GitHub

1. At the top of the web page there is a link “Upload FW” under which the form for uploading the firmware is available
   
2. or via USB-C using, for example, the web tool https://web.esphome.io/

The firmware currently makes peripherals accessible to MQTT, but it can be used as a basis for programming your own functionalities, or using your own code.

• Connectors (T1 and T2) for connecting two DS18B20 digital thermistors with automatic detection. Reading temperature every 20 seconds and sending to MQTT with topic /T1-Celsius
• Ethernet connection using RJ45 connector with IP address retrieval from DHCP server. Static IP address setting is not implemented
• http web server publishing two pages
  • mqtt-wall, which is a web MQTT client, for displaying messages that the device has sent to the MQTT broker
  • SETUP page for configuring the device contains settings
    
    • MQTT topic
    • Device ID
    • RS485 (USB-C) BAUDRATE
    • MQTT broker IP
    • MQTT broker PORT
    • websocet MQTT PORT
    • MQTT Login
    • MQTT Password
• Saving device settings to internal eeprom
• OTA update - allows you to update the device firmware via Ethernet via the web interface. Available at [IP]:82/update, or from the link on the main page of mqtt-wall
• MQTT client for sending and receiving messages from the broker
• Measuring POE voltage and sending the value to MQTT when it changes
• Watchdog timer, triggers a device restart if the firmware stops for longer than 60s
• detect USB-C plug and publish to MQTT with topic /USBdetect
• RS485-MQTT proxy - received RS485 data forward to MQTT with topic /RS485_RX

• The modul can be powered in the range of 9-14V DC with a maximum consumption of 0,5A
• The power supply can be connected in two ways
  1. pluggable DC jack directly.
     Attention to polarity!
     
     This input is protected by a 1A fuse.
     
     
  2. Ethernet passive POE with external POE injector
     
     The POE injector is protected with also 0.5A fuse.

• GitHub Arduino sample code
  
• Releases on GitHub sign without ESPhome label
  

• .PDF schematics rev 0.3