I tried runnig the code and I can see the tx channel blink but it’s not getting any response from the unit, and te log also said that no response is recieved. anyone who had the same problem and found a solution?
@Fire_blade
What hardware do you use?
Note that the standard modbus adres from Brink is 20 (hex 0x14) instead of 01 (hex 0x1) in the example
I use the NODE MCU ESP32 with the same rs485 module used in the example on the same pins as the example. I also tried 0x14 with no luck and changed the unit to chanel 1 with 0x1 in the esp code with no luck.
when i log back in to the unit the channel was back at 20 for some reson, so tried again with 0x14 but stil no response
the connection settings are
modbus
chanel: 20
baudrate: 19k2
pairity: even
so it should in theory work but it doesn’t…
I dont know where you live, but i can provide a esp32 (usb3 or micro usb) with modbus print (enri.nl), ttl to 485 board and a 3d printed cabinet to put it in.
I live in the netherlands.
Edit: I made a new design of the PCB with MAX3485 (XY-017) instead of MAX485 and no more CRC Check failures.
1 Like
Hi,
I try to install this addon to my HRU Flair 400 with ESP32 board az-delivery-devkit-v4 and the rs485 modul
I can flash the code to the ESP32 board (I specifie the board type) and I set the communication section on the HRU (Chanel 1 / baudrate: 19k2 / pairity: even)
but when I connect to my HRU I have this logs:
log
[16:15:26][C][ota:097]: Using Password.
[16:15:26][C][api:138]: API Server:
[16:15:26][C][api:139]: Address: modbus.local:6053
[16:15:26][C][api:141]: Using noise encryption: YES
[16:15:26][C][modbus_controller:275]: ModbusController:
[16:15:26][C][modbus_controller:276]: Address: 0x01
[16:15:26][D][modbus_controller:032]: Modbus command to device=1 register=0x1F40 countdown=0 no response received - removed from send queue
[16:15:27][W][modbus:105]: Modbus CRC Check failed! D248!=90E8
[16:15:28][D][modbus_controller:032]: Modbus command to device=1 register=0xFC0 countdown=0 no response received - removed from send queue
[16:15:28][W][modbus:105]: Modbus CRC Check failed! D248!=7361
[16:15:29][D][modbus_controller:032]: Modbus command to device=1 register=0xFC4 countdown=0 no response received - removed from send queue
[16:15:30][D][modbus_controller:032]: Modbus command to device=1 register=0xFCA countdown=0 no response received - removed from send queue
[16:15:32][D][modbus_controller:032]: Modbus command to device=1 register=0xFCE countdown=0 no response received - removed from send queue
[16:15:33][D][modbus_controller:032]: Modbus command to device=1 register=0xFD2 countdown=0 no response received - removed from send queue
[16:15:34][D][modbus_controller:032]: Modbus command to device=1 register=0xFF1 countdown=0 no response received - removed from send queue
[16:15:56][D][sensor:127]: Rekup Power Difference: Sending state nan W with 1 decimals of accuracy
maybe it is the same problem than @ Fire_blade.
Thanks for your helps
Hi
After all the issue comes from the connection between HRU <-> RS485 <-> ESP. Now it works !
If that helps somebody I maked a schema of my setup:
I am having issues - using this setup, my nodemcu doesn’t read any data even though I can control the unit 
. Modbus: Can write to the device but cannot read: no response received Any help would be appreciated!
I used MAX485 and one of them was faulty, resulting in many CRC checks error. Switching the module helped. My final config with MAX485:
esphome:
name: hrv-controller
platform: ESP8266
board: nodemcuv2
# Enable logging
logger:
#level: VERBOSE
baud_rate: 0
# Enable Home Assistant API
api:
ota:
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
manual_ip:
static_ip: 192.168.0.19
gateway: 192.168.0.1
subnet: 255.255.255.0
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Esphome HRV control"
password: "GvJ6AafkENq6"
captive_portal:
uart:
id: mod_bus
tx_pin: D3
rx_pin: D2
baud_rate: 19200
parity: even
modbus:
id: modbus1
flow_control_pin: D0
send_wait_time: 2000ms
modbus_controller:
- id: rekup
address: 0x14
modbus_id: modbus1
setup_priority: -10
update_interval: 15s
text_sensor:
- platform: modbus_controller
modbus_controller_id: rekup
id: rekup_bypass_status_text
register_type: read
address: 4050
raw_encode: NONE
name: Rekup Bypass Status
lambda: |-
uint16_t int_mode = (data[item->offset] << 8) + data[item->offset+1];
ESP_LOGD("main","Parsed operation mode int : %d", int_mode);
std::string mode_str;
switch (int_mode) {
case 0: mode_str = "INITIALIZATING"; break;
case 1: mode_str = "OPEN"; break;
case 2: mode_str = "CLOSED"; break;
case 3: mode_str = "OPEN"; break;
case 4: mode_str = "CLOSED"; break;
default: mode_str = "Unknown"; break;
}
return mode_str;
sensor:
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup To House temperature"
id: rekup_to_house_temp
register_type: read
address: 4036
unit_of_measurement: "°C"
value_type: S_WORD
accuracy_decimals: 1
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup To House humidity"
id: rekup_to_house_humidity
register_type: read
address: 4037
unit_of_measurement: "%"
value_type: S_WORD
accuracy_decimals: 1
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup To Outside Temperature"
id: rekup_to_outside_temp
register_type: read
address: 4046
unit_of_measurement: "°C"
value_type: S_WORD
accuracy_decimals: 1
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup To Outside humidity"
id: rekup_to_outside_humidity
register_type: read
address: 4047
unit_of_measurement: "%"
value_type: S_WORD
accuracy_decimals: 1
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup From Outside Temperature"
id: rekup_from_outside_temp
register_type: read
address: 4081
unit_of_measurement: "°C"
value_type: S_WORD
accuracy_decimals: 1
filters:
- multiply: 0.1
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Flow Actual Intake"
id: rekup_prutok_in
register_type: read
address: 4032
unit_of_measurement: "m3/h"
value_type: S_WORD
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Flow Actual Exhaust"
id: rekup_prutok_out
register_type: read
address: 4042
unit_of_measurement: "m3/h"
value_type: S_WORD
select:
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Modbus Control Mode"
address: 8000
value_type: S_WORD
optimistic : TRUE
optionsmap:
"Device LCD": 0
"Modbus Step": 1
"Modbus Flow": 2
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Bypass Mode"
address: 6100
value_type: S_WORD
optimistic : TRUE
optionsmap:
"Auto": 0
"Closed": 1
"Open": 2
switch:
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Bypass Boost switch"
register_type: holding
address: 6104
bitmask: 1
entity_category: config
icon: "mdi:toggle-switch"
number:
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Modbus step setting"
id: rekup_step_setting
register_type: holding
address: 8001
value_type: S_WORD
min_value: 0
max_value: 3
mode: slider
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Modbus flow value"
id: rekup_prutok_nastaveni
register_type: holding
address: 8002
value_type: S_WORD
min_value: 0
max_value: 400
mode: slider
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Flow 1"
id: rekup_flow_1
register_type: holding
address: 6001
unit_of_measurement: "m3/h"
value_type: S_WORD
min_value: 50
max_value: 400
mode: slider
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Flow 2"
id: rekup_flow_2
register_type: holding
address: 6002
unit_of_measurement: "m3/h"
value_type: S_WORD
min_value: 50
max_value: 400
mode: slider
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Flow 3"
id: rekup_flow_3
register_type: holding
address: 6003
unit_of_measurement: "m3/h"
value_type: S_WORD
min_value: 50
max_value: 400
mode: slider
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Fan Imbalance Intake"
id: rekup_imbalance_intake
register_type: holding
address: 6035
unit_of_measurement: "%"
value_type: S_WORD
multiply: 10
min_value: -15
max_value: 15
mode: slider
- platform: modbus_controller
modbus_controller_id: rekup
name: "Rekup Fan Imbalance Exhaust"
id: rekup_imbalance_exhaust
register_type: holding
address: 6036
unit_of_measurement: "%"
value_type: S_WORD
multiply: 10
min_value: -15
max_value: 15
mode: slider
Hello all,
Had a problem with communication as BroutMouton did:
…countdown=0 no response received - removed from send queue
Managed to solve that by changing modbus address to “14” and parity to “even”
but I still have a problem with changing control mode (8000) and step setting (8001)
they are “stuck” on “Modbus Step” and “0”
I can change the values of flow rate 1/2/3 from ESPHome and brink web page, I am reading temperatures and flow rates.
Would appreciate any help as I am out of ideas for now 
BTW: I can no longer control steps from display or brink web page
esphome:
name: "esphome-web-brink"
esp32:
board: esp32dev
framework:
type: arduino
# Enable logging
logger:
# Enable Home Assistant API
api:
ota:
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Esphome-Web-Brink"
password: "5la53ezGV7fx"
captive_portal:
web_server:
port: 80
uart:
id: mod_bus
tx_pin: 16
rx_pin: 17
baud_rate: 19200
stop_bits: 1
parity: even
modbus:
id: modbus1
modbus_controller:
- id: brink
## the Modbus device addr.
address: 0x14
modbus_id: modbus1
setup_priority: -10
sensor:
- platform: modbus_controller
modbus_controller_id: brink
name: "Brink To House temperature"
id: brink_to_house_temp
register_type: read
address: 4036
unit_of_measurement: "°C"
value_type: S_WORD
accuracy_decimals: 1
filters:
- multiply: 0.1
select:
- platform: modbus_controller
modbus_controller_id: brink
name: "Brink Modbus Control Mode"
address: 8000
value_type: S_WORD
optimistic : TRUE
optionsmap:
"Device LCD": 0
"Modbus Step": 1
"Modbus Flow": 2
number:
- platform: modbus_controller
modbus_controller_id: brink
name: "Brink Modbus step setting"
id: brink_step_setting
register_type: holding
address: 8001
value_type: S_WORD
min_value: 0
max_value: 3
mode: slider
UPDATE:
after restarting HRU I lost any connectivity, half of unit menu was dissabled.
ESPHome could not read any values from the unit
20:04:35 [D] [modbus_controller.select:048]
Found value 1 for option 'Modbus Step'
20:04:35 [D] [select:015]
'Brink Modbus Control Mode': Sending state Modbus Step (index 1)
20:04:36 [D] [modbus_controller:032]
Modbus command to device=20 register=0x1F40 countdown=0 no response received - removed from send queue
20:04:45 [D] [modbus_controller:032]
Modbus command to device=20 register=0x1F40 countdown=0 no response received - removed from send queue
20:04:46 [D] [modbus_controller:032]
Modbus command to device=20 register=0xFC4 countdown=0 no response received - removed from send queue
When I change back communication to InternalBus, restart the unit, connect ESPHome and change communication back to ModBus - connection restores (i can read temperature) but still cannot change “step settings” or “Modbus control mode”
And everything repeats after restart of HRU - no connection with HRU
@kotrfa asked me to share the picture card on my home assistant dashboard, so here it goes:
Picture-elements card - picture
code for the picture elements card:
type: picture-elements
image: local/images/wtw_icons2.png
elements:
- type: state-label
entity: sensor.huidig_inlaatluchtvolume
style:
top: 59%
left: 73%
color: black
- type: state-label
entity: sensor.huidig_uitlaatluchtvolume
style:
top: 59%
left: 27%
color: black
- type: state-label
entity: sensor.binnen_aanzuig_temperatuur
style:
top: 20%
left: 92%
color: darkred
- type: state-label
entity: sensor.binnen_aanzuig_luchtvochtigheid
style:
top: 28%
left: 92%
color: '#4171b1'
- type: state-label
entity: sensor.binnen_uitblaas_temperatuur
style:
top: 77%
left: 92%
color: darkred
- type: state-label
entity: sensor.binnen_uitblaas_luchtvochtigheid
style:
top: 85%
left: 92%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_aanzuig_temperatuur
style:
top: 20%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_humidity
style:
top: 26%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_uitblaas_temperatuur
style:
top: 77%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_uitblaas_luchtvochtigheid
style:
top: 85%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.bypass_status
prefix: 'Bypass: '
style:
top: 26%
left: 50%
color: black
- type: state-label
entity: sensor.rendement
prefix: 'η= '
style:
top: 72%
left: 50%
color: black
- type: state-label
entity: sensor.filter_wissel_in
prefix: 'Filterwissel in '
suffix: agen
style:
top: 92%
I use a DHT22 for the suction house side, so this temperature and humidity is normally not available.
Sorry, most of it is in Dutch language.
Also i calculate dewpoint from this suction temperature and humidity with esphome code
And the “performance” (rendement in dutch) in the picture card is also a calculation between suction side house, exhaust side house and suction side outside temperature
Here is the complete code for the vertical stack including the 4 ventilation stands.
type: vertical-stack
cards:
- type: picture-elements
image: local/images/wtw_icons2.png
elements:
- type: state-label
entity: sensor.huidig_inlaatluchtvolume
style:
top: 59%
left: 73%
color: black
- type: state-label
entity: sensor.huidig_uitlaatluchtvolume
style:
top: 59%
left: 27%
color: black
- type: state-label
entity: sensor.binnen_aanzuig_temperatuur
style:
top: 20%
left: 92%
color: darkred
- type: state-label
entity: sensor.binnen_aanzuig_luchtvochtigheid
style:
top: 28%
left: 92%
color: '#4171b1'
- type: state-label
entity: sensor.binnen_uitblaas_temperatuur
style:
top: 77%
left: 92%
color: darkred
- type: state-label
entity: sensor.binnen_uitblaas_luchtvochtigheid
style:
top: 85%
left: 92%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_aanzuig_temperatuur
style:
top: 20%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_humidity
style:
top: 26%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_uitblaas_temperatuur
style:
top: 77%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.buiten_uitblaas_luchtvochtigheid
style:
top: 85%
left: 14.5%
color: '#4171b1'
- type: state-label
entity: sensor.bypass_status
prefix: 'Bypass: '
style:
top: 26%
left: 50%
color: black
- type: state-label
entity: sensor.rendement
prefix: 'η= '
style:
top: 72%
left: 50%
color: black
- type: state-label
entity: sensor.filter_wissel_in
prefix: 'Filterwissel in '
suffix: agen
style:
top: 92%
left: 50%
color: black
- type: horizontal-stack
cards:
- type: custom:button-card
name: Afwezig
styles:
card:
- height: 150px
icon: mdi:fan-auto
size: 75%
show_state: true
state:
- operator: template
value: |
[[[
return states['number.ventilatie_stand'].state == "0.0"
]]]
color: darkcyan
tap_action:
action: call-service
service: number.set_value
service_data:
value: 0
entity_id: number.ventilatie_stand
- type: custom:button-card
name: Stand1
styles:
card:
- height: 150px
icon: mdi:fan-speed-1
size: 75%
show_state: true
state:
- operator: template
value: |
[[[
return states['number.ventilatie_stand'].state == "1.0"
]]]
color: darkcyan
- operator: default
tap_action:
action: call-service
service: number.set_value
service_data:
value: 1
entity_id: number.ventilatie_stand
- type: custom:button-card
name: Stand2
styles:
card:
- height: 150px
icon: mdi:fan-speed-2
size: 75%
show_state: true
state:
- operator: template
value: |
[[[
return states['number.ventilatie_stand'].state == "2.0"
]]]
color: darkcyan
tap_action:
action: call-service
service: number.set_value
service_data:
value: 2
entity_id: number.ventilatie_stand
- type: custom:button-card
name: Stand3
styles:
card:
- height: 150px
icon: mdi:fan-speed-3
size: 75%
show_state: true
state:
- operator: template
value: |
[[[
return states['number.ventilatie_stand'].state == "3.0"
]]]
color: darkcyan
tap_action:
action: call-service
service: number.set_value
service_data:
value: 3
entity_id: number.ventilatie_stand
- type: entity
entity: sensor.power_14
state_color: false
name: power
icon: mdi:power-socket-eu
- type: history-graph
hours_to_show: 24
entities:
- entity: sensor.woonkamer_co2
- entity: sensor.slaapkamer_co2
- entity: sensor.badkamer_co2
- entity: sensor.zolder_co2
4 Likes
Very tempting; that it screams for more details:
Would like to know more on how/where you placed the DHT22 in the system tubes.
Also interested in your calculations: I got no further then a Delta Temperature between Fresh air and Exhaust air, but you did much more; Congratulations!
If (translation) this is too specific, DM in Dutch is ook goed 
1 Like
@ggaljoen
The DHT-22 (from dfrobot) just basicly hangs in the inlet. (wires under the flexible hose)
ESP32+DHT22
sensor:
# extra DHT22 sensor on the house suction side as it is not present in the Brink Flair.
- platform: dht
model: DHT22
pin: 22
temperature:
name: Binnen aanzuig temperatuur
id: temp_from_inside
humidity:
name: Binnen aanzuig luchtvochtigheid
id: humidity_from_inside
update_interval: 15s
I have ordered now a C02 sensor from df robot, which has also humidity and temperature
Gravity: SCD41 Infrared CO2 Sensor I2C - DFRobot
# - platform: scd4x
# co2:
# name: "CO2"
# id: co2_from_inside
# temperature:
# name: Binnen aanzuig temperatuur
# id: temp_from_inside
# humidity:
# name: Binnen aanzuig luchtvochtigheid
# id: humidity_from_inside
But then it is not ~$5 anymore 
Here is the code for performance (rendement):
sensor:
- platform: template
name: Rendement
id: performance
unit_of_measurement: "%"
update_interval: 30s
lambda: 'return ((id(temp_to_inside).state - id(temp_from_outside).state)/(id(temp_from_inside).state - id(temp_from_outside).state)*100);'
# (temp_to_inside - temp_from_outside) / (temp_from_inside - temp_from_outside)
And here the code for dewpoint
sensor:
- platform: template
name: Binnen dauwpunt
id: dewpoint_to_inside
lambda: |-
return (243.5*(log(id(humidity_to_inside).state/100)+((17.67*id(temp_to_inside).state)/
(243.5+id(temp_to_inside).state)))/(17.67-log(id(humidity_to_inside).state/100)-
((17.67*id(temp_to_inside).state)/(243.5+id(temp_to_inside).state))));
unit_of_measurement: °C
update_interval: 15s
icon: 'mdi:thermometer-water'
I hope its clear, otherwise i need to put the complete code online, but that is not equal to the TS because of the DHT22
1 Like
Guys, any ideas?
Maybe I misunderstood the installation instructions?
Help would be highly appreciated 
Thanks
I have tried more things - updates flair main board firmware, updated control panel firmware,
tried another ESP32 board, tried anothe UART to RS485 bord - no luck as the issue was in another place:
I’m using a BRINK PLUS board. And connected ESP32 to its ModBus port
Settings regarding communication on flair are applied after reboot, that is why after reboot of HRU I lost connectivity when communication type was set to ModBus.
I have changed bus type back to “InternalBus” (bound rate 19k2, parity: even) and everything started to work properly.
Could you please share what is hiding behind(how do you calculate):
sensor.filter_wissel_in
I will share my code, so you can look for yourself
1 Like
Thanks for the code,
did you buy brink “RHT Humidity Sensor”? It is insanely expensive 
I’m asking as i see that you have declared sensor on 4083
Yes, i have bought this RH sensor from Brink.
I also have had a DHT22 on the house suction side, because brink has no information on that.
I needed that to calculate performance “rendement”
Now i have bought a CO2 sensor from DFrobot, with RH and temperature to readout through I2C
Also works fine on the same esp32 (MH-ET-LIVE)
1 Like
Thanks for this great thread. I managed to set this up aswell. Im using a wemos d1 as mentioned above but instead of connecting it to the usb on the from i got a power shield and connect it to the 24v from the flair 300
nice indeed, though I am lost a bit in the latest state of affairs…
did anyone ever contact the devs at Brink at all? Seems they are always a bit reluctant to join modern technologies and are now implementing their own closed system.
Would be nice if they opened up their api’s (if at all available), and would help create an integration/add-on of sorts…
Having all Brink devices here, that would certainly be most welcome…