Replies: 7 comments 8 replies
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Hello, First of all, could you clarify where the automation is running? Is the automatic control of your HVAC system being managed on Home Assistant or is it being controlled by the internal mechanisms of the Samsung device? If the automation is running on Home Assistant, it is possible to modify the operation of the air conditioner using temperature data from an external sensor. In this scenario, you can update the automation rules on Home Assistant to change the device's operation or modes based on external sensor data. However, if the Samsung device is managing its own internal control mechanisms, it is not practically possible to interfere with its internal sensor readings. Devices like these typically rely on their own sensors for internal control and do not accept external data to override those readings. Therefore, it would not be possible to change the device's operation mode using an external sensor in this case. To provide more assistance and suggestions, could you share the complete details of your HVAC system? Information about the product models you are using, additional software (such as Home Assistant or any other automation systems), and other relevant details would help us provide better guidance. |
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There is no automation, I didn't say there is. This is pure data logging from regular AC operation in heating mode. My indoor unit is AJ026TNNDKG if it helps. Samsung has wired room controller (like MWR-WG00JN) which I assume has temperature sensor. You can connect that controller and I would expect that you can configure AC unit to take readings from wired room controller sensor instead of internal one. So idea is that ESP32 would emulate external controller like MWR-WG00JN and send room temperature via bus. ESP32 would get room temperature data either physically from wired sensor or wireless via network. Then AC would compensate power output based on external sensor data instead of internal. |
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I’m also interested in this. The room controller is on F3/F4? If yes, i did not find any documentation on that protocol, it seems those 2 wires carry both data and power |
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@bzumik1 That was also my initial idea. That some message can be sent on the bus that would simulate external sensor.
Regarding external controller, there is some information in this project, but its non-NASA protocol. |
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I have a wired controller and I had to configure the controller to get it's temperature reading from the controller rather than the sensor on the intake. I did this when I had the official wifi kit installed and when I replaced the kit with the atom it still gets that same information so I didn't have to make a temperature offset. Don't know if you can configure your controller the same way but it would be outside the scope of this project. You would need to look into programming your actual wired controller first. |
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I guess I'm only just seeing it all from my little bubble. I replaced my official Samsung wifi kit with an esp chip because they stopped supporting their app which I used to control my AC originally. The wifi kit didn't have any sensors in it at all. It just read data from the bus and was able to send basic commands like, on/off, mode changes, and target temperatures. I'm truly amazed by how much extra functionality is already provided like outdoor sensor temperature and power values that I could have only dreamed of getting from an official Samsung device. It was going to cost me $380 AUD for an upgraded wifi kit (if I could even find a non-nasa version) which would have connected to smart things. They would have inevitably stopped supporting that in the future as well. The atom chip and rs485 adapter cost me $30 all up and thanks to the hard work of programmers and this community I'm now free from the cloud and no-one can take it away from me. I just feel like some people's expectations are a bit too high. This is all just my perspective though. I'm Australian, we don't get snow here and I don't even really understand HVAC. It's just AC here. Please forgive my ignorance. |
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Okay, no problem, everyone, calm down :). I am closing this discussion, but I will look at this issue in detail later when I have free time. Please be patient and wait. I thank everyone for their contributions. |
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Hi,
few days ago I've added this project to my Samsung 4-way cassette unit which didn't come with WiFi. Everything works like a charm. So I was experimenting with heating mode, and as now I'm collecting data from AC, I've noticed that device is turning off and on every 4 minutes. Its internal temperature sensor reaches target temperature very quickly, while room temperature takes longer than that.
Here is the graph
Top graph shows target temperature (red), room temperature (yellow), internal sensor temperature (blue). On below graph we see outdoor power which shows that outdoor unit is turning on and off about every 4 minutes.
I was wondering if it would be possible to add external sensor to this project so AC would adjust its output based on sensor in the room instead of internal sensor. E.g. have one sensor that would push data to MQTT topic, then esphome_samsung_hvac device would read from this topic and send it to AC. Or something that would emulate wired external controller.
Is something like that possible?
Thanks
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