Daly BMS Sensor¶
The daly_bms sensor platform allows you to use a Daly Smart BMS
(more info)
with ESPHome.
The BMS communicates via UART.
# 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, 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.
current (Optional): Current flowing trough the BMS (input or output from batttery).
battery_level (Optional): Battery level in % (SoC).
max_cell_voltage (Optional): The cell of the battery with the higher voltage.
max_cell_voltage_number (Optional): The cell number of the battery with the higher voltage.
min_cell_voltage (Optional): The cell of the battery with the lower voltage.
min_cell_voltage_number (Optional): The cell number of the battery with the lower voltage.
max_temperature (Optional): The higher temperature measured from the temperature sensors.
max_temperature_probe_number (Optional): The sensor number which has measured the higher temperature.
min_temperature (Optional): The lower temperature measured from the temperature sensors.
min_temperature_probe_number (Optional): The sensor number which has measured the lower temperature.
remaining_capacity (Optional): The capacity in Ah left in the battery.
cells_number (Optional): The number of cells in series in the battery pack.
temperature_1 (Optional): The first temperature sensor.
temperature_2 (Optional): The second temperature sensor.
cell_1_voltage (Optional): The voltage of cell number 1. Cell number can be from 1 to 16.
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, ID): Set the ID of this sensor for use in lambdas.
All other options from 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, ID): Set the ID of this sensor for use in lambdas.
All other options from 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, ID): Set the ID of this sensor for use in lambdas.
All other options from 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
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
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
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
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.
uart:
...
rx_buffer_size: 512