Closed Blanketier closed 10 months ago
Hey here is a good player to ask questions and I would love to see the power infrastructure changes. Thanks! David
is the purpose of this section to switch between battery operated and usb powered depending on weather usb is plugged in?
Yes and to detect if USB is plugged in to go out of battery mode.
The more I look at the schematic of this portion I dont think it works as intended and simply works for the wrong reasons. The diode is forward biased and leaks the small amount of current necessary to power the board. I think this only works as a diode-or gate which would be sufficient for this board but is not the best in terms of efficiency.
either way the board im making will be using a tps2116 power mux from TI
That's all pretty Standart stuff. Almost every esp32 dev board uses these cheap components to protect the battery and only use it, if USB is disconnected. The MOSFETs is conducting if USB is disconnected. And the diode otherwise conducts power to the device. Using an expensive and not at my supplier lcsc available part is no improvement.
I have run out of projects that I can make without spending an ungodly amount of money in R&D and me and a friend thought it would be fun if we mapped out the CO₂ monitor you have posted. You did not post the files for the schematic and board and only posted the images. looking at the schematic I have decided to just make a revised schematic with better power infrastructure and a few other misc. improvements. I was wondering if there is anyway to get in contact with you for you to explain some of your design choices?