If you ordered one of the CP2102 modules with the micro-USB socket, be sure you check the voltage at the 3.3V, DTR and TXD outputs before you install it. Some modules are around 4.3V on those outputs, which is not what you want.
The pic below shows what I did with JP1 and JP2. I took over the SWD block, cut the traces going to the middle holes, and connected JP1 and JP2 to them instead. The right-angle pin headers are accessed through yet another hole in the case.
CP2102 and the buck boost boards arrived today whilst I was at work , currently got the boards jerry rigged together so I will check the voltages from the cp2102
I know that the 5v > GND on the header is straight USB power (5v measured)
Just measured the 3.3v against GND on the CP2102 board I bought to install internally and indeed it seems to be putting out 4.27v!
Same with txo and rxi pins against ground...doh! -I guess this one is no good then?
What's that all about then?
Just checked the CP2102 board I did the last firmware flash with and that is 3.3v as it should be
Can't thank you enough as I wouldn't have bothered checking and would have blindly believed the pin labelling!
Now to try and recall where I got it from to ask some pertinent questions!
Edited to add - just found some references to the issue
(Specifically - https://www.silabs.com/community/interf ... tputi-EaVr
I got the item from Banggood and have had a whinge
Not sure f I am capable of attempting to cut pin 9 free from the capacitor as suggested...soldering a 4k7 resistor to pin 6 from this cut leg is even less likely!
I may give it a go as not a lot to lose as its only fit for the bin as it stands
....and I got out the knife and a magnifying glass and VERY cautiously cut the pin9 trace that goes to the cap....and hey presto I now have 3.4v on the 3.3v line and TX and RX
Good to go?