For the first time, i have a working "transducer board" / power supply that can handle both AC and battery inputs.
It isn't perfect, it is just all I have at the moment and a lot of blood sweat and tears went into getting even that.
the photo is attached (you can see that I had some "issues" such as limited parts availability, unwillingness to risk parts, goofs, etc)
The Schematic is attached -- and yes, you will have to pick the values off the photo of the board (will do better later)
In the built board, I have only so far put in ONE of the two trickle charging parallel current sources.? ?No matter.??
TWO ISSUES:
1.? The Adafruit board works? (0x77) but I could not get the KeeYee BMP280 board to work.? Why?? I dunno.? ?Wrong bus voltage?? Dunnno.? SEND 3.3 VOLTS TO THE I2C BUS please -- the Ashar 0.1schematic/Stapleton 1.0 Board use 3.3 volt bus.? ?
2.? Dumb me, the AC Power green led stays dimly lit even when the battery is having to run the thing.? ?May have to put a resistor in parallel with the Green LED to get it to quit.? ?Will work on that later.??
This is of course optional.? ?I was instructed to add battery backup (I'm a volunteer, remember?) by the UF Team -- so I did.? ?Now it turns out tht the FDA will accept merely having a commercial UPS running the thing.? Duh!? ?We didn't know that until a day ago.
No warrntees; no guarantees; use any of this information at your own risk.
