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Kaldek / rat-ratgdo

Open source schematics for ratgdo PCB
MIT License
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Using red wire for power.md #14

Closed aasorokighb closed 9 months ago

aasorokighb commented 9 months ago

"The input capacitor of the voltage regulator module (usually rated 100uF) will be replaced with a 1000uF Low-ESR capacitor." Why would you put buffer cap on high voltage side? It is shorted by bus driver anyway (or is it protected by a diode?). Should you put it on 5V side and use 5v to 3.3v on board regulator for driving board? Sorry, I just ordered my stuff. It will take a few weeks till it arrives.

Kaldek commented 9 months ago

It doesn't really matter now anyway as the voltage regulator and ESP can't be powered by the GDO's red wire because they draw too much current. I'm parking this for now.

Kaldek commented 9 months ago

Issue closed as prototype of power supply using red wire current parked due to current draw too high.

CrazyCoder commented 9 months ago

@Kaldek Do you think it may work for Genie using the obstruction sensor wire that has ~12V?

Kaldek commented 9 months ago

@Kaldek Do you think it may work for Genie using the obstruction sensor wire that has ~12V?

If you can find a voltage source that can take the current, absolutely. That could be the sensor you're considering or maybe something else we haven't tried yet.

CrazyCoder commented 9 months ago

I mean the existing sensors that are already installed and wired. They have 12V on them, but I'm not sure what extra current their power source can provide. I'm afraid to damage the Genie by trying to pull too much current for ESP32 via the buck converter.

CrazyCoder commented 9 months ago

I gave it a try and it didn't work. Even 0.3A current is too much for the obstruction sensor, and its light goes off when I plug my test board.

Kaldek commented 9 months ago

I gave it a try and it didn't work. Even 0.3A current is too much for the obstruction sensor, and its light goes off when I plug my test board.

Yeah it's a bit of a bummer, but I suppose there's no real issue with using external power via USB. It's mainly going to be an issue for development of a raw board using an ESP-12F for example. Arguably any design which removes the USB interface is a bit of a pain though because reflashing the chip becomes annoying unless the reflash can be done OTA (which it generally can), and the initial flash before building using an ESP flashing cradle is also more work than just connecting a D1 Mini board to USB.

rlowens commented 9 months ago

I plan on opening up my GDO and tapping 3.3v from the board.