I have a board version of the attached schematic, and things are not working as expected. This builds on a previous design which worked well, which had the same subcircuits for the TP4056, the ESP12F, and the RT9013. This board has new circuits for the DTR/RTS MOSFET network (for 8266 programming), an ADC voltage divider (R11+R12), a voltage on/off switch at Q3, and the subcircuit on the bottom right which is meant to drive the enable pin of RT9013.
When I connect my FTDI to J1 the FTDI resets continuously, which occurs if the 3.3V and ground lines are the only ones connected to the board. I've tested the FTDI with other boards and it's working well. I don't even have to to program anything, when I touch the Gnd and 3.3V lines while the computer logs it says the FTDI disconnected (it's rebooting). In measuring connectivity between G and 3.3V from J1 I can see there is some kind of short circuit.
So these boards are toast, the only point of them now is to learn why they aren't working. I can desolder components to try to isolate the problem. What component would you recommend I desolder to learn more? Also do you see an issue with this schematic that would cause a short circuit of some kind?
Thanks!
When I connect my FTDI to J1 the FTDI resets continuously, which occurs if the 3.3V and ground lines are the only ones connected to the board. I've tested the FTDI with other boards and it's working well. I don't even have to to program anything, when I touch the Gnd and 3.3V lines while the computer logs it says the FTDI disconnected (it's rebooting). In measuring connectivity between G and 3.3V from J1 I can see there is some kind of short circuit.
So these boards are toast, the only point of them now is to learn why they aren't working. I can desolder components to try to isolate the problem. What component would you recommend I desolder to learn more? Also do you see an issue with this schematic that would cause a short circuit of some kind?
Thanks!
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