esphome-docs/components/sensor/daly_bms.rst

Daly BMS Sensor
===============

.. seo::
    :description: Instructions for setting up a Daly Smart BMS
    :image: daly_bms.jpg

The ``daly_bms`` sensor platform allows you to use a Daly Smart BMS
(`more info <https://dalyelec.en.made-in-china.com/>`__)
with ESPHome.

The BMS communicates via :ref:`UART <uart>`.

.. figure:: images/daly_bms_example.png
    :align: center
    :width: 100.0%


.. code-block:: yaml

    # Example configuration entry (ESP8266)
    uart:
      tx_pin: GPIO1
      rx_pin: GPIO3
      baud_rate: 9600

    daly_bms:
      update_interval: 20s

    sensor:
      - platform: daly_bms
        voltage:
          name: "Battery Voltage"
        current:
          name: "Battery Current"
        battery_level:
          name: "Battery Level"
        max_cell_voltage:
          name: "Max Cell Voltage"
        max_cell_voltage_number:
          name: "Max Cell Voltage Number"
        min_cell_voltage:
          name: "Min Cell Voltage"
        min_cell_voltage_number:
          name: "Min Cell Voltage Number"
        max_temperature:
          name: "Max Temperature"
        max_temperature_probe_number:
          name: "Max Temperature Probe Number"
        min_temperature:
          name: "Min Temperature"
        min_temperature_probe_number:
          name: "Min Temperature Probe Number"
        remaining_capacity:
          name: "Remaining Capacity"
        cells_number:
          name: "Cells Number"
        temperature_1:
          name: "Temperature 1"
        temperature_2:
          name: "Temperature 2"
        cell_1_voltage:
          name: "Cell 1 Voltage"
        cell_2_voltage:
          name: "Cell 2 Voltage"
        cell_3_voltage:
          name: "Cell 3 Voltage"
        cell_4_voltage:
          name: "Cell 4 Voltage"

    text_sensor:
      - platform: daly_bms
        status:
          name: "BMS Status"


    binary_sensor:
      - platform: daly_bms
        charging_mos_enabled:
          name: "Charging MOS"
        discharging_mos_enabled:
          name: "Discharging MOS"

Component/Hub
-------------

Configuration variables:
************************

- **update_interval** (*Optional*, :ref:`config-time`): Delay between data requests.
- **address** (*Optional*, int): Address to use, defaults to ``0x80``.

Sensor
------

A sensor platform to read BMS data

Configuration variables:
************************

- **voltage** (*Optional*): Voltage of the battery pack connected to Daly BMS.

  - **name** (**Required**, string): The name for the voltage sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **current** (*Optional*): Current flowing trough the BMS (input or output from batttery).

  - **name** (**Required**, string): The name for the current sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **battery_level** (*Optional*): Battery level in % (SoC).

  - **name** (**Required**, string): The name for the SoC sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **max_cell_voltage** (*Optional*): The cell of the battery with the higher voltage.

  - **name** (**Required**, string): The name for the Max Cell Voltage sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **max_cell_voltage_number** (*Optional*): The cell number of the battery with the higher voltage.

  - **name** (**Required**, string): The name for the Max Cell Voltage Number sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **min_cell_voltage** (*Optional*): The cell of the battery with the lower voltage.

  - **name** (**Required**, string): The name for the Min Cell Voltage sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **min_cell_voltage_number** (*Optional*): The cell number of the battery with the lower voltage.

  - **name** (**Required**, string): The name for the Min Cell Voltage Number sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **max_temperature** (*Optional*): The higher temperature measured from the temperature sensors.

  - **name** (**Required**, string): The name for the Max Temperature sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **max_temperature_probe_number** (*Optional*): The sensor number which has measured the higher temperature.

  - **name** (**Required**, string): The name for the Max Temperature Probe Number sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **min_temperature** (*Optional*): The lower temperature measured from the temperature sensors.

  - **name** (**Required**, string): The name for the Min Temperature sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **min_temperature_probe_number** (*Optional*): The sensor number which has measured the lower temperature.

  - **name** (**Required**, string): The name for the Min Temperature Probe Number sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **remaining_capacity** (*Optional*): The capacity in Ah left in the battery.

  - **name** (**Required**, string): The name for the Remaining Capacity sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **cells_number** (*Optional*): The number of cells in series in the battery pack.

  - **name** (**Required**, string): The name for the Cells Number sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **temperature_1** (*Optional*): The first temperature sensor.

  - **name** (**Required**, string): The name for the first temperature sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **temperature_2** (*Optional*): The second temperature sensor.

  - **name** (**Required**, string): The name for the second temperature sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

- **cell_1_voltage** (*Optional*): The voltage of cell number 1. Cell number can be from 1 to 16.

  - **name** (**Required**, string): The name for the cell voltage sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Sensor <config-sensor>`.

Text Sensor
-----------

Text sensor that indicates the status of BMS.

Configuration variables:
************************

- **status** (*Optional*): The BMS Status (Charging, Discharging, Stationary).

  - **name** (**Required**, string): The name for the BMS status text sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Text Sensor <config-text_sensor>`.

Binary Sensor
-------------

Binary sensor that indicates the status of MOS.

Configuration variables:
************************

- **charging_mos_enabled** (*Optional*): The BMS charging MOS status to enable the recharge of the battery.

  - **name** (**Required**, string): The name for the charging MOS binary sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Binary Sensor <config-binary_sensor>`.

- **discharging_mos_enabled** (*Optional*): The BMS discharging mos status to enable the load.

  - **name** (**Required**, string): The name for the discharging MOS binary sensor.
  - **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
  - All other options from :ref:`Binary Sensor <config-binary_sensor>`.


Control BMS
-----------
At this moment Daly sensor platform don't suppport controlling you BMS, but you can make some stuff using uart.write

First you need to setup binary sensors for charging and disharging MOS  
  
.. code-block:: yaml  

    
    binary_sensor:
      - platform: daly_bms
        charging_mos_enabled:
          name: "Daly Charging MOS"
          id: bin_daly_chg_mos # binary MOS sensor must have ID to use with switch
          internal: True # but you can make it internal to avoid duplication
        discharging_mos_enabled:
          name: "Daly Discharging MOS"
          id: bin_daly_dischg_mos # binary MOS sensor must have ID to use with switch
          internal: True # but you can make it internal to avoid duplication

Then you can add switches  
  
.. code-block:: yaml  

    
    switch:
      - platform: template
        name: "Daly Charging MOS"
        lambda: |-
          if (id(bin_daly_chg_mos).state) {
            return true;
          } else {
            return false;
          }
        turn_on_action:
          - uart.write:
              data: [0xA5, 0x40, 0xDA, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC8]
          - logger.log: 
              format: "Send cmd to Daly: Set charge MOS on"
        turn_off_action:
          - uart.write:
              data: [0xA5, 0x40, 0xDA, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC7]
          - logger.log: 
              format: "Send cmd to Daly: Set charge MOS off"

      - platform: template
        name: "Daly Discharging MOS"
        lambda: |-
          if (id(bin_daly_dischg_mos).state) {
            return true;
          } else {
            return false;
          }
        turn_on_action:
          - uart.write:
              data: [0xA5, 0x40, 0xD9, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC7]
          - logger.log: 
              format: "Send cmd to Daly: Set discharge MOS on"
        turn_off_action:
          - uart.write:
              data: [0xA5, 0x40, 0xD9, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC6]
          - logger.log: 
              format: "Send cmd to Daly: Set discharge MOS off"


Also you can add select to change battery level
  
.. code-block:: yaml  

    
    select:
      - platform: template
        name: "Daly Battery Level setup"
        optimistic: True
        options:
          - 100%
          - 75%
          - 50%
          - 25%
          - 0%
        initial_option: 100%
        set_action:
          then:
            - if:
                condition:
                  lambda: 'return x == "100%";'
                then:
                  - uart.write:
                      data: [0xA5, 0x40, 0x21, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xE8, 0xF9]
                  - logger.log: 
                      format: "Send cmd to Daly: Set SOC to 100%"
                else:
                  - if:
                      condition:
                        lambda: 'return x == "75%";'
                      then:
                        - uart.write:
                            data: [0xA5, 0x40, 0x21, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xEE, 0xFE]
                        - logger.log: 
                            format: "Send cmd to Daly: Set SOC to 75%"
                      else:
                        - if:
                            condition:
                              lambda: 'return x == "50%";'
                            then:
                              - uart.write:
                                  data: [0xA5, 0x40, 0x21, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xF4, 0x03]
                              - logger.log: 
                                  format: "Send cmd to Daly: Set SOC to 50%"
                            else:
                              - if:
                                  condition:
                                    lambda: 'return x == "25%";'
                                  then:
                                    - uart.write:
                                        data: [0xA5, 0x40, 0x21, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFA, 0x08]
                                    - logger.log: 
                                        format: "Send cmd to Daly: Set SOC to 25%"
                                  else:
                                    - if:
                                        condition:
                                          lambda: 'return x == "0%";'
                                        then:
                                          - uart.write:
                                              data: [0xA5, 0x40, 0x21, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0E]
                                          - logger.log: 
                                              format: "Send cmd to Daly: Set SOC to 0%"
                                              
                                                
UART Connection
---------------

Connect RX from BMS to TX in ESP board and TX from BMS to RX in ESP board

.. figure:: images/daly_bms_pinout.png
    :align: center
    :width: 100.0%

    Uart Pinout.
    
**3.3v Warning:** some BMS 3.3v cant source large currents and may not work to properly power the ESP. If you are having WIFI connection issues or similar, try a different power source. There is 12-15v available on the Daly connector which via a proper step-down converter can properly power the ESP.

On the ESP32 (untested on ESP8266) if you are having missing data (such as Temperature 1/2), it may be due to UART buffer size.
Add the following to your configuration to increase the buffer from the default 256 to 512.

.. code-block:: 

    uart: 
      ...
      rx_buffer_size: 512



See Also
--------

- :ref:`sensor-filters`
- :apiref:`daly_bms/daly_bms.h`
- :ghedit:`Edit`