NEW: Support for themad shapping signals via X85A port

[javimurcia]

Adds support for X85A 4 level power limitation (as implemented by the demand shapping PCB), disussed in #170

It is not possible to enable several output at the same time, even if that is supported by daikin, since the unit will only follow the most restrictive input.

ie: if level 1 limits the power to 5kw and level 2 limits the power to 3kw, and bot inputs are active, the unit will be limited to 3kw, so the level 1 input has no effect)

[raomin]

Thanks Javi for that. I'll have a deeper look in the coming week and merge if ok.

[ap20132022]

is there anything new?
I wonder how wire diagramm looks like? Do I have to connect the GND (from Pin 6) to one pin of the relay and Pin 2,3,4,5 each to another pin of the relay?
Are 4 level fix (1: 5kW, 2: 4kW, 3: 3kW, 4: 2kW, 5: 1kW)?

[javimurcia]

is there anything new? I wonder how wire diagramm looks like? Do I have to connect the GND (from Pin 6) to one pin of the relay and Pin 2,3,4,5 each to another pin of the relay? Are 4 level fix (1: 5kW, 2: 4kW, 3: 3kW, 4: 2kW, 5: 1kW)?

The limit levels are not fixed, you can (and should, because I don't know what the default values are) set them on the indoor unit controller.

As for the wiring, you need 4 relays. Pin 6 goes to the common of all 4 four relays, and each of the 4 signal wires goes to the N/O of its corresponding relay.

[DieterB61]

The limit levels are not fixed, you can (and should, because I don't know what the default values are) set them on the indoor unit controller.

In my Altherma 3 R W EHBH08E9W (8kW-LT) I can assign predefined power levels which differ by 0.5kW to the 4 limits (0.5kW, 1kW, 1,5kW ...). Thus the levels are not completely free.

As for the wiring, you need 4 relays. Pin 6 goes to the common of all 4 four relays, and each of the 4 signal wires goes to the N/O of its corresponding relay.

@raomin said in first post of #170 that there will be no need for relays?

[arc12]

Will this PR be merged?
This is a useful function to have.

[jf-wm]

Any update why this PR is still not merged?

[luksa]

Works nicely. I connected the esp32 directly to the x85a (without the demand pcb). The only issue is that the configured limit level is lost when the esp32 is restarted. You could store it in the eeprom the way they do it here. Also, maybe use a more descriptive name for the MQTT topic (instead of x85a).

[arc12]

The only issue is that the configured limit level is lost when the esp32 is restarted

Would using a "retained" MQTT message help? These are re-sent when the esp32 re-establishes its connection to the broker.

[luksa]

@arc12 You're right. Sending a retained MQTT message does in fact ensure that the power limit is automatically re-established on every future reboot.

Thanks!