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https://github.com/mjpalmowski/esphome-juntek-dpm8650-mqtt-http-tool

Control your JUNTEK 50A Buck converter using its RS485 interface. "WIFI dongle" Homeasistant/NodeRed/Web Control ESPHome YAML Config
https://github.com/mjpalmowski/esphome-juntek-dpm8650-mqtt-http-tool

dpm8650 esphome-devices homeassistant juntek mqtt webapp

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Control your JUNTEK 50A Buck converter using its RS485 interface. "WIFI dongle" Homeasistant/NodeRed/Web Control ESPHome YAML Config

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README 

        
# ESPHome Juntek DPM8650 MQTT & HTTP Tool



Control your **[Juntek DPM8650 50A Buck Converter](./JT-DPM8650_Datasheet-EN_2024-02-14.pdf)** using its RS485 Modbus interface. This setup integrates seamlessly with **Home Assistant**, **Node-RED**, or a simple web control interface using [ESPHome YAML configuration](./dpm8650_controller.YAML)



# ESP32 MQTT dongle



![Screenshot 2024-11-20 105037](https://github.com/user-attachments/assets/9da001c9-dc4f-4839-ad26-15c840f8210d)



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## Hardware Setup



### Hardware Diagram



![Screenshot 2024-11-19 125602](https://github.com/user-attachments/assets/147db45e-df32-43c5-aa40-c21b1624f38f)



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### Wiring Diagram



Wiring for the ESP32 to RS485 connection:



- **TX Pin (ESP)** → **TX Pin (TTL to RS485 Board)**

- **RX Pin (ESP)** → **RX Pin (TTL to RS485 Board)**



Ensure the TX and RX pins are connected as described:



Screenshot 2024-11-19 125220



For detailed ESPHome configuration, refer to the [DPM8650 Controller YAML](./dpm8650_controller.YAML).



## DPM8650 Configuration



To set up your Juntek DPM8650, follow these steps:



1. **Long-press the SET button** on your DPM8650 to enter the configuration menu.

2. Adjust the following settings:



   - **Communication Port (5-CS)**: Set this to `1` to enable RS485 Modbus communication.

     

     ![RS485 Communication Setting](https://github.com/user-attachments/assets/3c7d8b94-be98-4546-a028-9f66a0a23167)



   - **Baud Rate (6-bd)**: Set this to `009.6` for a baud rate of 9600.

  

     ![Screenshot 2024-11-19 125050](https://github.com/user-attachments/assets/3caa70ed-20bc-4912-88d7-e7dbc53f51af)



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## Interface Options



Depending on your use case, you can enable different interfaces in the [DPM8650 Controller YAML](./dpm8650_controller.YAML).



1. **Home Assistant API**:

   - Keep the `api:` block if you're using Home Assistant integration.



2. **MQTT for Node-RED**:

   - Retain the `mqtt:` block if you're using MQTT for integration with Node-RED or other MQTT clients.



3. **Web Interface**:

   - Use the `web_server:` block if you prefer controlling the DPM8650 via a simple web interface.

  



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## Home Assistant Integration



Here's a screenshot of how the DPM8650 sensors and controls appear in Home Assistant:



![Home Assistant Screenshot 1](https://github.com/user-attachments/assets/b4653e18-b158-4e96-b338-9c1baadd233c)



![Home Assistant Screenshot 2](https://github.com/user-attachments/assets/e3875b73-5015-4242-b751-a7b257a10a61)



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## Web Control Interface



You can also control the DPM8650 via a built-in web tool which you can find on your network at http://dpm8650_controller.local/



![Screenshot 2025-01-20 152345](https://github.com/user-attachments/assets/6ed36754-8280-4219-99bd-c5b63c4d871b)



## MQTT Configuration



### MQTT Sensors and Controls



- **MQTT Text Sensor 'CCCV Output State Label'**  

  - State Topic: `dpm8650_controller/sensor/cccv_output_state_label/state`



- **MQTT Sensor 'MAX Output Voltage'**  

  - State Topic: `dpm8650_controller/sensor/max_output_voltage/state`



- **MQTT Sensor 'MAX Output Current'**  

  - State Topic: `dpm8650_controller/sensor/max_output_current/state`



- **MQTT Sensor 'Output Voltage'**  

  - State Topic: `dpm8650_controller/sensor/output_voltage/state`



- **MQTT Sensor 'Output Current'**  

  - State Topic: `dpm8650_controller/sensor/output_current/state`



- **MQTT Sensor 'Temperature'**  

  - State Topic: `dpm8650_controller/sensor/temperature/state`



- **MQTT Number 'Set MAX Voltage'**  

  - State Topic: `dpm8650_controller/number/set_max_voltage/state`



- **MQTT Number 'Set MAX Current'**  

  - State Topic: `dpm8650_controller/number/set_max_current/state`



- **MQTT Switch 'Output Control'**  

  - State Topic: `dpm8650_controller/switch/output_control/state`  

  - Command Topic: `dpm8650_controller/switch/output_control/command`  



  ![Screenshot 2024-11-20 110606](https://github.com/user-attachments/assets/c65462c0-e6ce-4368-a1a1-66056a36dfd6)



  Message payload string `on` to `dpm8650_controller/switch/output_control/command` enables Converter output  



  ![Screenshot 2024-11-20 110631](https://github.com/user-attachments/assets/5a5aa78e-367e-4854-9ecf-8271a99b5652)



  Message payload string `off` to `dpm8650_controller/switch/output_control/command` disables converter output



  



- **MQTT Binary Sensor 'CCCV Output State'**  

  - State Topic: `dpm8650_controller/binary_sensor/cccv_output_state/state`



### MQTT Subscribe Sensors



- **MQTT Subscribe Text Sensor 'MQTT Voltage Command'**  

  - Topic: `home/commands/voltage`  

    (The converter subscribes to this topic. Publish a number (e.g., 12.3) to set the voltage to 12.3V)

- **MQTT Subscribe Text Sensor 'MQTT Current Command'**  

  - Topic: `home/commands/current`  

    (The converter subscribes to this topic. Publish a number (e.g., 12.3) to set the current to 12.3A)

    

  ![Screenshot 2024-11-20 132203](https://github.com/user-attachments/assets/8c17a976-8cc4-436f-bbff-5d378bf162e8)



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## Resources



[Library](https://github.com/Lotiq/DPM8600)



[Manual](./JT-DPM8600-Manual_2024-05-24.pdf)



[Modbus Protocol](./JT-DPM86XX_Communication_protocol_2023-01-05.pdf)