Post AoBjgJTOFX8Oc1aTce by timonsku@mastodon.social
 (DIR) More posts by timonsku@mastodon.social
 (DIR) Post #AoBjgILYRBGx7Quhlo by timonsku@mastodon.social
       2024-11-10T21:26:38Z
       
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       Oura Gen 3 charger PCB. Am interested in figuring out how it works. It's a surprisingly expensive item (69€).On the back (which is facing upwards when installed into the charger) is this IR transceiver/receiver. It seems to communicate via the rings IR diodes which are normally used for SpO2 measurements.
       
 (DIR) Post #AoBjgJTOFX8Oc1aTce by timonsku@mastodon.social
       2024-11-10T21:29:27Z
       
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       Luckily fairly easy to trace board.The IR part seems to be a Vishay "BELOBOG" series IR receiver. So no sending, just receiving. I could imagine that its just to signal the charger about state to give feedback to the user via the status LED (e.g. done charging, pairing active etc). The voltage on the charging coil is about 22V in respect to GND and modulated at ~7MHz
       
 (DIR) Post #AoBjgJsuidYDtBWrPE by timonsku@mastodon.social
       2024-11-19T03:32:07Z
       
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       I have the Oura charger fully reverse engineered by now and drawn up a schematic. Some capacitor values are guesses but circuit wise thats basically it. The LED bit confuses me, why do they have two GPIOs hooked up to each color of the RGB LED. One with current limiting resistor and one directly??
       
 (DIR) Post #AoBjgKvQql9x7HiNyC by timonsku@mastodon.social
       2024-11-19T03:41:06Z
       
       0 likes, 1 repeats
       
       My updated scribbles. I do most of the reverse engineering in Photoshop.