u/Kalex8876

Good day all,

Wishing you a blessed Good Friday. I finally finished routing my v1 prototype for the indoor light trickle charger discussed here and here.

I've gotten good feedback from posting on here, I appreciate all the help. To address two major concerns brought up with my last BOM:

1. I got suggestions to change my test loops to test pads. I will do that. But, after I have this prototype and validate that even works. Then, I can change it to pads and think of how best to automate testing.

Now, on to the PCB. It's a 4-layer board, I don't see this being able to be done 2 layers. Its stackup: Signal -> GND -> Power -> Signal.

The main features here (if you don't want to look at other posts):

• Selective MPPT
• Optional battery ok indicator
• Fuel gauge for batteries that can see state of charge, voltage and charge/discharge rate

I will likely test this out using like an arduino pro mini or low power MCU that can use wifi and have a project over there than use a li-ion and solar cells like these to see if it will power on then to see how much we are harvesting. I'd be very grateful to hear suggestions for a bare minimum lab to test this board to help with the spec sheet. For now, I'm thinking:

• Spectrum analyzer
• Oscilloscope
• Multimeter (would need to measure uA or even nA and uV, also have diode test function)
• Power Profiler like this
• Soldering station

• ⁠ DC electronic load

• MCU and peripherals ofc

I have uploaded files to PCBWay to see a more accurate quote. Currently, each board costs about $28, that's with assembly.

I'd appreciate feedback on the board. And if you think the prototype looks good, then any advice on next steps? I have at least 2 months gap before I can be in a place to set up a home lab and actually test. I assume it's when you have a working prototype, that you can look at like kickstarter or serious content creation?

Here is the PCB:

​Thank you all