I'm going to post separately on this, but what we actually need to occupy all that extra room is a second channel.robocog wrote:Yes all good - had it transmitting data successfully
The lipo fits (1300 mah cell split from a 3s pack), as does the charging board and the 9v boost board along with the cp2102 - and the case still fits and there is room for more if needed...(bluetooth/voltage monitor/dip switch for firmware updates?)
However the small 9v boost board is too noisy and is making the trace all wobbly, tried a few caps on the output but it seemed to make no difference
Have ordered another (but bigger) adjustable boost board that I know does not put out enough noise that the traces are wonky
(quickly swapped one out from another project) - but it does swallow up any extra room for expansion
Not yet discovered how to graph the output from the data from the cp2102 yet, but that is for another thread
Thanks once again for such an informative thread (and a massive thanks for the headsup on the rogue voltages on the cp2102 - disaster averted!)
Interesting - on that link you show to the one that is 3v3 - the image also shows the pin 9 trace (wrongly) going to the cap?
The pictures on that Ebay link are all wrong. They show a bad module. But what I received from them was two good modules. So far, good modules do not have "CJMCU" silkscreened on them, and have the TXD output silkcreened "TXD" instead of "TXO". Also, the good ones appear to have a resettable fuse up by the USB socket ("105") instead of a plain jumper ("000"). But of course as time goes on, he will have to order new stock, which may or may not be good. I have sent him email impressing on him the difference involved here, and the need to maintain his supply of good parts, and urged him to change the photos to pics of what he's actually selling, but got only a brief non-committal response, and he hasn't changed the photos. So you still have to check the voltage of whatever you get.