[NASA] F1/F2 users

[lanwin]

I you are have a NASA System and use the connection between outdoor and indoor units (F1/F2) then please let me know here.

My plan is to have a list of users who are willing to give feedback or test if something works.

[DerTiger1]

I'd like to support:
NASA F1/F2 on Samsung AR24TXHZAWKNEU with M5Stack Atom lite.
Framework: ESP-IDF (all my devices are proxying bluetooth of my Switchbot door & window contacts and sensors)

[atanasenko]

NASA F1/F2, 3 indoor AR09TXFCAWKNEU units, M5Stack AtomS3 lite.
I'm new to esphome and esp programming in general, but I think I'm getting a hang of it.

[bazmaroon]

NASA F1/F2 on Samsung AC030KNZDCH/AA (CNH30ZDK) using M5Stack Atom Matrix ESP32 Development Kit
Looking good so far. Documentation straightforward.

[brazoayeye]

NASA with
Indoor: AE090RNYDEG
Outdoor: AE090RXEDEG
wifi smart things: MIM-H04EN
ESP on a custom board, i bought a cheap RS485

As described here it's easy to detect requests using smart things app and the MIM-H04EN

[jasonb194]

I have two outdoor units and use F1/F2.
One system only works with f1 and f2 switched so I am happy to do additional testing
One Indoor unit on each has a M5Stack Atom lite installed.

[daaaaan]

I'm on a 16kw Air to Water Heat Pump System, 1 Mono Outdoor unit : AE160JXYDEH/EU
Indoor Controller : MIM-E03CN
Esphome Hardware : M5Stack Atom lite + M5Stack ATOM Tail485

Let me know if I can help.

[mbo18]

Late to the party!
Got two AR09TXCAAWKNEU and one AR12TXCAAWKNEU
Using 3 M5STACK ATOM Lite with RS-485 base on main branch currently to get power and energy sensors

[hnykda]

I got 3xAR07TXFCAWKNEU and 2xAR09TXFCAWKNEU (I have two outdoor units, the config below is for 3 indoor units connected to one of the two outdoor units. I use the similar config for the rest of the units)

I did not use M5Stack ATOM, but I used ESP32 and MAX485 (less than 10$ altogether). The wiring is as follows (gnd not connected on the input to RS485, using hardware tx/rx, note that these cheap RS485 modules are often faulty, the first one just didn't work for me):

This is my ESPHome config:

substitutions:
  name: ac-control-iota
  friendly_name: AC Control Iota (Southern ACs)

esphome:
  name: ${name}
  friendly_name: ${friendly_name}
  min_version: 2024.6.0
  name_add_mac_suffix: false
  project:
    name: esphome.web
    version: "1.0"

esp32:
  board: esp32dev

logger:
  level: INFO
  baud_rate: 0
  logs:
    component: ERROR # Remove the "Your component takes to long to respond warning"

api:

ota:
  platform: esphome

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # remove when DHCP resets
  manual_ip:
    static_ip: 192.168.0.232
    gateway: 192.168.0.1
    subnet: 255.255.255.0

captive_portal:

uart:
  tx_pin: GPIO1
  rx_pin: GPIO3
  parity: EVEN
  baud_rate: 9600

## SAMSUNG AC CONFIGURATION
external_components:
  - source: github://lanwin/esphome_samsung_ac@6e7001c # latest commit on main as of June 30
    components: [samsung_ac]

# Configuration of AC component
samsung_ac:
  # non_nasa_keepalive: false
  capabilities:
    vertical_swing: true
    horizontal_swing: true
    presets:
      quiet: true
      fast: true
      windfree: true
      sleep: true

  non_nasa_keepalive: false

  devices:
    - address: "20.00.00"
      climate:
        name: "Children room AC"
      room_temperature:
        name: "Children room AC temperature"
      target_temperature:
        name: "Children room AC target temperature"
      power:
        name: "Children room AC power"
      mode:
        name: "Children room AC mode"
      room_humidity:
        name: "Children room AC humidity"
      room_temperature_offset: -2
    - address: "20.00.01"
      climate:
        name: "Nest AC"
      room_temperature:
        name: "Nest AC temperature"
      target_temperature:
        name: "Nest AC target temperature"
      room_humidity:
        name: "Nest AC humidity"
      power:
        name: "Nest AC power"
      mode:
        name: "Nest AC mode"
      room_temperature_offset: -2
    - address: "20.00.02"
      climate:
        name: "Den AC"
      room_temperature:
        name: "Den AC temperature"
      target_temperature:
        name: "Den AC target temperature"
      room_humidity:
        name: "Den AC humidity"
      power:
        name: "Den AC power"
      mode:
        name: "Den AC mode"
      room_temperature_offset: -2

An example output to what to look after in the console:

when trivially added in Home Assistant:

[mchiriciuc]

Hi Steve!

And biiiig THANK YOU for this!
F1/F2 on a indoor/outdoor (well, three of them actually) AR12TXFYAWKNEU/AR12TXFYAWKXEU

And the relevant part of my config (I plan on adding more custom sensors)

external_components:
  - source: github://lanwin/esphome_samsung_ac@main # use @main if you want the latest development (possibly unstable?)
    components: [samsung_ac]

# Configuration of AC component
samsung_ac:
  capabilities:
    vertical_swing: true
    horizontal_swing: false
    presets:
      quiet: true
      fast: true
      windfree: false
      sleep: true

  devices:
    - address: "20.00.00"
      climate:
        name: "Inverter"
      room_temperature:
        name: "Indoor temperature"
      target_temperature:
        name: "Target temperature"
      power:
        name: "AC power"
      mode:
        name: "Mode"
      room_temperature_offset: 0
    - address: "10.00.00"      
      outdoor_temperature:
        name: "Outdoor temperature"
      custom_sensor:
        - name: "Power"
          message: 0x8411      
          unit_of_measurement: W
          icon: "mdi:flash"
          device_class: power
        - name: "Energy total"
          message: 0x8414
          unit_of_measurement: Wh
          icon: "mdi:counter"
          device_class: energy

Will send some beers later on ;)

[Spyke1979]

Hi, this for me:
dual split indoor AR09TXHZAWKNEU + AR12TXHZAWKNEU, outdoor AJ040TXJ2KG
Atom lite + RS485 base work nice for me!
I've tried the solution with a generic esp32 and cheap 485 board, but no data results.
Now I can try for adding some custom sensors, can anyone help me about this?

[brazoayeye]

You can use xlsm i did few days ago. #28 (comment)
Download, allow macros, flush the file with the button.
Make a log from espHome enabling logs with debug_log_messages: true , and save it as txt.
Make sure log is long at least 1 minute to collect all messages moving in the network.

Now filter the file to only show "Sent by" <> Empty
Check if you need that data or you want them to be shown in HASS.

When you find the address you are intrested in, just add a custom_sensor as in the previous post putting the right address (message) and name, unit_of_measurement.

[Spyke1979]

Thank’s for your reply, I will try this next days!
Thank you guys for this great project and for your time spent in,

[omerfaruk-aran]

I you are have a NASA System and use the connection between outdoor and indoor units (F1/F2) then please let me know here.

My plan is to have a list of users who are willing to give feedback or test if something works.

Hello,

I have a NASA System and use the connection between outdoor and indoor units via the F1/F2 ports. My outdoor unit models are AJ068TXJ3KH/EA and AJ050TXJ2KH/EA, and my indoor unit models are AJ050TNAPKH/TK (1 unit) and AJ025TNAPKH/TK (3 units).

I am willing to provide feedback and test if something works. Please feel free to reach out to me.

Best regards!

[Hichi]

Hello,

I'am using AR09TXEAAWKNEU indoor unit and 09 TXCAAWKX/EU outdoor unit. F1 and F2 Ports. I use the same config as @hnykda with Atom lite + RS485.

It does work, at first... When I switch the breaker on, the ESP starts and the AC beeps. whithin the first minute i can then start the AC via the ESP32. I do recieve Log data and can change the modes, read the sensors, everything is fine. Then, after some time it only works intermittent. I retightend all srew terminals, repluged the plug as well as the Atom.

Sometimes I can start the AC after a longer periode of time, sometimes i have push this botton multiple times:

Sometimes I can't start it with the ESP at all and have to use the remote control or the stupid Smart Things app (that is the main reason i want local API control)

Here a picture of my "Setup"...

[hnykda]

It looks good to me. Are you sure it's not WiFi reception of atom making problems? I.e. is Atom still showing reasonable RSSI values or can you ping it (to see if the problem is really comm between atom and the AC unit)?

[Hichi]

Hi @hnykda thanks for your response. I'am 100% sure its communication between Atom and AC. I can Ping the Atom as well as visit its web interface. Yesterday for example it was working from 9:48 until 22:04. After that i only recieved the "Update" info from log. At 22:15 I switched the AC off via IR remote.

[hnykda]

Oh... No idea then, sorry.

I made mistake of connecting my ESP32 to wrong 12v (I think I got the pin next to it), and it worked "a bit" until it didn't. Just in case you were not on the right pins for the voltage... But that doesn't seem to be the same.

Try different ATOM? Try connecting to a different device (i.e. different AC indoor/outdoor unit)?

[htht2001]

I have a NASA system with 21 indoor units and two outdoor units (in one circuit)
One unit is fresh air
I have access to F1/F2 and R1/R2
If you need help with anything, I'm here for you

[dierkgrossfeld]

Also got my climate finally installed today and had no luck with those cheap converters on generic esp32:
https://amzn.eu/d/hciTff0

Consists of
Outdoor: AJ080 TXJ4KG/EU
4 times indoor: AR07 TXHZAWKN/EU

So should be supported....

Tried multiple of those modules, removed also the 120 Ohm resistor.
No luck yet.

I can get the Atom, but no RS485 base for it here in Germany, at least not for an acceptable price.

Are there any suggestions for rs485-ttl converters to use on a generic esp32 ?

PS: Funnyly enough:
When I disconnect the esp rx/tx, i see receive data on the converter.
As soon as i plug in the esp no leds anymore.

So any help appreciated.

[brazoayeye]

I used the One described at #106 (comment)

But I have a heat pump with one internal unit

[dierkgrossfeld]

🙇‍♂️ thanks for your reply !
Have seen that and those are on the first sight the ones i also bought.
Does not seem to work.
I should have mentioned that I power the esp at the moment from a external usb power supply.
But actually that shouldnt make a difference imho.
Ordered another one for testing with an MAX13487 chip on it.
Not 100% compatible since it need 5 Volts but hopefully it will work also with 3.3 on an esp.
In another project I saw than one is using it without any issue on an esp32

[lanwin]

@dierkgrossfeld I ordered mine via aliexpress. The delivery took a litt but it also works to Germany.

[lanwin]

I also used such RS485 converter from amazon with a nodeMCU before. But in my experience they are much more fragile. In example I used a step down converter from 12V of my AC to 5V. But it did not worked with that. I had to change the step down converter to ~9V to make it work, even both devices are not designed for 9V.

[dierkgrossfeld]

Hi,
sorry was unavailable some days.

Got it finally to work with an DSD Tech SH-U12 and an generic ESP32 with step down converter to 5V.
Works rock solid so far.

Was a bit complicated to get everything inside the hvac compartment but actually it works :)

Had to used uart 2 to get it to work.
For whatever reason it did not work with uart0.
And yes, I changed the logger: baudrate to 0 ;-)

[techyporcupine]

Can confirm the functionality of a NASA AR12TSFABWKNCV indoor unit and a AR12TSFACWKX outdoor unit.
I'm using an M5Stamp Pico and a cheap RS485 converter branded "HiLetGo" off amazon!

[dierkgrossfeld]

interesting, look the same than the ones i used at first.
strange. seems sometimes they work, sometimes not.
or maybe i did something wrong. but actually i connected it the same way i now do with the dsdtech.
cant get it together 🤣

[techyporcupine]

I actually should specify something. The TX and RX on the converter on the side that connects to the ESP are swapped. Maybe try putting TX to TX and RX to RX

[dierkgrossfeld]

Did that too, on both sides (esp and rs485). But will somewhen try again. For now it works :)

[dierkgrossfeld]

The funny thing is:
If i only conncted the interface to the nasa bus, i can see also rx light flashing when giving it power supply on the ttl side.
So rx flashing.
As soon as i connect the esp, it goes off.
Tried also 2 different interfaces just to sort out a bad one.
Also tried to remove the 120 ohms resistor with no difference.
I guess they are simply not meant for 3.3 volts, even if they state to be and are also not the same, even if they look like....

[Beormund]

I now have my AE120RXYDEG Heat Pump working with the ESPHome node. This uses F1/F2 with NASA protocol. I'm using an M5Stack Atom Lite. My heat pump configuration consists of heating and hot water. The heating is controlled by room thermostats (underfloor heating downstairs; rads upstairs). I have 4 zones downstairs and 1 zone upstairs. All of this is configured as a single heating "Zone" on the heat pump controller (MIM-E03CN). Pretty much all you can do is turn the heating "Zone" on or off. The rest is controlled via the room stats. DHW (Domestic Hot Water) is set to "Standard" but can be changed to "Eco", "Power", or "Force". You can set the Target Temperature for the DHW. I created a YAML that uses the existing sensor, switch, select and number controls to create 2 thermostat climate controls in ESPHome. I did this so that I could exclude unwanted modes as only "Off" and "Heat" modes are needed. I'm still not sure it is worth having a thermostat control for heating since all I can really do is switch on/off and display the flow temperature and flow target temperatures. But the hot water thermostat is working well. I can schedule the hot water to utilise a lower rate nightly electricity tariff (Octopus Go).

Here's the YAML:

substitutions:
  name: esphome-web-a15124
  friendly_name: 'Heat Pump'

esphome:
  name: ${name}
  friendly_name: ${friendly_name}
  min_version: 2024.6.0
  name_add_mac_suffix: false
  project:
    name: esphome.web
    version: dev

esp32:
  board: m5stack-atom

# Enable logging
logger:
  logs:
    component: ERROR

# Enable Home Assistant API
api:

# Allow Over-The-Air updates
ota:
  platform: esphome

# Allow provisioning Wi-Fi via serial
improv_serial:

wifi:
  # Set up a wifi access point
  ap: {}

# In combination with the `ap` this allows the user
# to provision wifi credentials to the device via WiFi AP.
captive_portal:

# To have a "next url" for improv serial
web_server:
  port: 80

# Status LED. Make built-in LED flash red when there is an error
light:
  - platform: status_led
    id: status_light
    output: status_output
  - platform: neopixelbus
    id: atom_led
    name: Status LED
    type: RGB
    variant: 800KBPS
    pin: 27
    num_leds: 1
    icon: mdi:led-outline
    entity_category: config
    restore_mode: ALWAYS_OFF
    method:
      type: esp32_rmt
      channel: 0          

switch:
  - platform: template
    id: status_led_switch
    optimistic: true
    on_turn_on:
      - light.turn_on: 
          id: atom_led
          red: 0.0
          green: 1.0
          blue: 0.0
          transition_length: 50ms
    on_turn_off:
      - light.turn_on:
          id: atom_led
          red: 1.0
          green: 0.0
          blue: 0.0
          transition_length: 50ms

output:
  - platform: template
    id: status_output
    type: binary
    write_action:
      - if:
          condition:
             lambda: return state > 0;
          then:
            - if:
                condition:
                  switch.is_off: status_led_switch
                then:
                  switch.turn_on: status_led_switch
          else:
            - if:
                condition:
                  switch.is_on: status_led_switch
                then:
                  switch.turn_off: status_led_switch



# Specify pins used by the board to comunicate with RS485 board - in this case M5STACK
uart:
  tx_pin: GPIO19   # Use GPIO26 for ATOM Tail485 
  rx_pin: GPIO22   # Use GPIO32 for ATOM Tail485
  baud_rate: 9600
  parity: EVEN

## SAMSUNG AC CONFIGURATION

# Import custom component from GitHub
external_components:
  - source: github://omerfaruk-aran/esphome_samsung_hvac_bus@main
    components: [samsung_ac]

# Configuration of AC component
samsung_ac: 

  #debug_log_messages: true
  #debug_log_undefined_messages: true

  devices:

    - address: "20.00.00" # Indoor Device

      # DHW
      water_heater_power:
        name: "DHW Power"
        id: dhw_power
        on_turn_off:
          then:
            - if:
                condition:
                  lambda: "return id(climate_hot_water).mode > 0;"
                then:
                  - climate.control:
                      id: climate_hot_water
                      mode: "OFF"
        on_turn_on:
          then:
            - if:
                condition:
                  lambda: "return id(climate_hot_water).mode != 3;"
                then:
                  - climate.control:
                      id: climate_hot_water
                      mode: "HEAT"

      water_target_temperature:
        name: "DHW Target Temperature"
        id: hot_water_target_temp
        on_value:
          then:
            - if:
                condition:
                  lambda: "return x != id(climate_hot_water).target_temperature;"
                then:
                  - climate.control:
                      id: climate_hot_water
                      target_temperature: !lambda "return x;"

      water_heater_mode:
        name: "DHW Mode"
        id: hotwater_mode

      water_temperature:
        name: "DHW Temperature"
        id: hot_water_current_temp


      # Heating
      power:
        name: "Zone Power"
        id: zone_power
        on_turn_off:
          then:
            - if:
                condition:
                  lambda: "return id(climate_heating).mode > 0;"
                then:
                  - climate.control:
                      id: climate_heating
                      mode: "OFF"
        on_turn_on:
          then:
            - if:
                condition:
                  lambda: "return id(climate_heating).mode != 3;"
                then:
                  - climate.control:
                      id: climate_heating
                      mode: "HEAT"

      mode:
        name: "Zone Mode"

      target_temperature:
        name: "Zone Target Temperature"
        id: zone_target_temp
        on_value:
          then:
            - climate.control:
                id: climate_heating
                target_temperature: !lambda "return x;"                      

      custom_sensor:

        - name: "Zone Temperature"
          id: zone_flow_temp
          message: 0x4238
          device_class: temperature
          state_class: measurement
          unit_of_measurement: "°C"
          filters:
            - multiply: 0.1
          accuracy_decimals: 1

        - name: "Heat Pump Produced Energy"
          message: 0x4427
          device_class: energy
          state_class: total_increasing
          unit_of_measurement: kWh          


    - address: "10.00.00" # Outdoor device
              
      # This sensor measures the instantaneous power consumption of the outdoor unit in Watts.
      # The captured value represents the current power draw of the outdoor HVAC components, helping track energy usage patterns.
      outdoor_instantaneous_power:
        name: "Heat Pump Instantaneous Power"

      # This sensor records the cumulative energy consumption of the outdoor unit in kWh.
      # It calculates the total energy consumed over time, allowing users to monitor and analyze energy efficiency.
      outdoor_cumulative_energy:
        name: "Heat Pump Cumulative Energy"

      # This sensor measures the current drawn by the outdoor unit in Amperes.
      # Monitoring current values helps identify electrical irregularities and ensure safe power levels in the system.
      outdoor_current:
        name: "Heat Pump Current"

      # This sensor tracks the voltage supplied to the outdoor unit in Volts.
      # Consistent voltage readings indicate stable power delivery, while deviations can help detect electrical issues in the system.
      outdoor_voltage:
        name: "Heat Pump Voltage"

       
climate:

  # DHW Climate Control
  - platform: thermostat
    name: "Hot Water"
    id: climate_hot_water
    sensor: hot_water_current_temp
    min_heating_off_time: 300s
    min_heating_run_time: 300s    
    min_idle_time: 30s
    target_temperature_change_action:
      then:
        - number.set:
            id: hot_water_target_temp
            value: !lambda "return id(climate_hot_water).target_temperature;"
    heat_action: {}
    idle_action: {}
    off_mode:
      then:
        - if:
            condition:
              switch.is_on: dhw_power
            then:
              switch.turn_off: dhw_power
    heat_mode:
      then:
        - if:
            condition:
              switch.is_off: dhw_power
            then:
              switch.turn_on: dhw_power
    default_preset: HOME
    preset:
      - name: ECO
        default_target_temperature_low: 45 °C
      - name: HOME
        default_target_temperature_low: 50 °C
      - name: AWAY
        default_target_temperature_low: 20 °C
      - name: BOOST
        default_target_temperature_low: 55 °C
      - name: SLEEP
        default_target_temperature_low: 60 °C
    visual:
      min_temperature: 20
      max_temperature: 70
      temperature_step:
        target_temperature: 0.5
        current_temperature: 0.1

  # Zone Climate Control
  - platform: thermostat
    name: "Heating"
    id: climate_heating
    sensor: zone_flow_temp
    min_heating_off_time: 300s
    min_heating_run_time: 300s    
    min_idle_time: 30s    
    heat_action: {}
    idle_action: {}
    off_mode:
      then:
        - if:
            condition:
              switch.is_on: zone_power
            then:
              switch.turn_off: zone_power
    heat_mode:
      then:
        - if:
            condition:
              switch.is_off: zone_power
            then:
              switch.turn_on: zone_power 
    visual:
      min_temperature: 0
      max_temperature: 70
      temperature_step:
        target_temperature: 1
        current_temperature: 0.1        

I make the Atom Lite built-in LED flash red if there is an error.

This creates two controls in HA:

Areas for Improvement

I tried to incorporate the hot water modes ("Eco", "Standard", "Power", "Force") as thermostat custom presets but ESPHome forces you to specify a target hot water temperature value for each custom preset which I didn't want. So I have settled for thermostat controls for on/heat and target temps but use a select drop-down for the hot water modes.

Heating and hot water can be powered on but idle (when target temperature is met). Right now there are no signals to indicate when the thermostats should indicate "Idle" or "Heating". Perhaps I can use the valves as an indicator? There are three valves in my system - one for hot water, one for underfloor heating and one for radiators. Hopefully there are NASA code messages for when these valves are activated. I plan to look into this by enabling MQTT Logging and looking for any NASA messages to do with valves.. Unless someone knows an easier way to determine when hot water and heating are calling for heat or idle?

Hope this helps anyone else who has this type of configuration.

Thank you to everyone for their help and input and thanks for a great ESPHome device!

[KoctaM]

Hi all, I managed get it work .
I have a AE140BXYDGG/EU Pump which should be NASA Protocol but it shows me non Nasa
I use ESP32 lite and cheap RS485 adapter. on F1/F2
I would like to write to the PWM address 0x40C4 but can't help myself.
Maybe someone have an idea,
I would like limit the PWM overnight so it's not that loud and at day back to normal.

[misterlab]

Can't you schedule quiet mode overnight using the indoor unit control panel through the service mode to achieve the same result?

[KoctaM]

Can't you schedule quiet mode overnight using the indoor unit control panel through the service mode to achieve the same result?

Yes I can do that, but what I have experienced is that the quiet mode only limits the frequency and the fan. I can also change the #4051 so the inverter pump only works with 70% but still it works the first few minutes at 100%.

That's why I would like to control the PWM signal.

[arundalep]

Unless someone else knows better, from what I have learnt through experimentation on my R32HTQ (MIM-03EN controller), the Samsung PWM implementation is very poor. Even if you adjust the PWM NASA value (0x40C4 using a custom climate to adjust), it still runs at 100% for the first 9 minutes, the same is true if you use the FSV-4051 to limit to 70%.
I am going to play around with an ESP pump controller to act as a bridge between the MIM and my Grundfos pump to truly limit the max pump speed and better control the DT.

[KoctaM]

Unless someone else knows better, from what I have learnt through experimentation on my R32HTQ (MIM-03EN controller), the Samsung PWM implementation is very poor. Even if you adjust the PWM NASA value (0x40C4 using a custom climate to adjust), it still runs at 100% for the first 9 minutes, the same is true if you use the FSV-4051 to limit to 70%. I am going to play around with an ESP pump controller to act as a bridge between the MIM and my Grundfos pump to truly limit the max pump speed and better control the DT.

Yes, I agree, it was also my second clue to use ESP for PWM and maybe control the compressor with 0-10V.

I have now installed Tasmota and a relay so I can switch between both PWM signals.

[ropmip]

Working (read only) with Samsung windfree Indoor AR24TXFYAWKN + Outdoor AR24TXFYAWKX.
M5Stack Atom Lite with tail RS485.
Should be NASA protocol as the address for the units is 20.00.00 and 10.00.00
It is working in read only (doesn't execute commands) not sure if it is a software issue (going to double check the TX wiring on the M5stack tail).

[jamesmorad]

Hello all, I'd like to first thank everyone involved for all the work on this project. I was really excited to discover the ability to unlock some additional potential out of my home's heat pump unit. I'd like to confirm that I am able to view my current temperature, set a target temperate, view my outdoor unit power status information, and generally appear to have healthy logs. I'll need to play around a bit more with my configuration to setup device capabilities but I'm really new to ESPHome and need to dig in a bit to understand what's available both in this module and on my unit.

My configuration is:
Indoor unit model: AC048BNHDCH
Outdoor unit model: AC048BXADCH
M5Stack Atom Lite + M5Stack Atom RS485

A picture of my assembly showing the hardware connection: