Indonesia Market Daikin Compatibility

[NathanAdhitya]

Hi, I wish to simply share my initial experiment results. Perhaps this would be useful for the other folks willing to try out this project or try it on their home Aircon.

I'm currently testing it on an FTKQ35SVM4. Upon opening the panel, the board has a S403 connector present.
The pinout was similar to other posts that mentioned the S403 connector. I was successfully able to connect Faikin to the AC. Faikin was able to obtain the home, liquid, and outside temps and was able to turn the AC on/off. The connector had a 2.54mm pitch. Regular Dupont connectors didn't fit so I had to modify a JST XH2.54 connector.

For this experiment, I used whatever material I had on hand. I used an ESP32 Dev board as the base, connected a 2N2222 with some resistors to handle 3.3V <-> 5V TX/RX, and a cheap step-down regulator. The RX side simply used a 1K and 2K voltage divider, the TX used a 2N2222 with a 10K pullup to the 5V.

I'm interested to know if there are other fellow people from the SEA region trying out this project. The models that are sold in the EU/UK seem to have different models from the ones sold here.

While my initial experiments were successful, I'll delay properly installing it as my janky work doesn't neatly fit inside the AC. Probably going to try to DIY a circuit board with affordable components that are easy to obtain here. If perhaps anyone has a more budget-friendly circuit board design for this project, I'm interested. The ESP32-S3-Mini seems a bit too expensive here. ESP-WROOM-32 seems much more obtainable.

Edit: Tried to open an FTC25NV14. S403 connector present. Dupont does not have enough friction. JST XH2.54 that fit in the FTKQ did not fit here.