Hi all!
This one might be better suited to the beginners forum, sorry if not appropriate for here!
I've recently finished building a tinyCurrent to help with some ultra-low power Arduino/ESP8266 projects I'd like to keep battery powered for several months.
mA and uA ranges work just fine by all tests, however the nA range does not give accurate values.
Using known inputs for a predictable output within ranges that should be measurable in both the uA and nA ranges, I'm seeing 1uA = ~450nA, and 0.5uA = ~150nA. As mentioned, given my known inputs the uA values are assumed accurate.
In all honesty, this doesn't bother me much as anything in the single-digit uA ranges is more than enough to know my project will live a long time on battery, but of course I'd still like to get it working.
I'm just hoping somebody might be able to offer some guidance on where I might look to find the source of the issue. Given I'm usually only on this forum looking for help, if anybody can help I've still got 5 spare PCBs for this so happy to post these out to anybody who can help me out
Schematic for tinyCurrent can be found here:
https://github.com/nfhw/tinycurrent/blob/master/Altium/Project%20Outputs%20for%20tinyCurrent_Version1/Schematic.PDFAny help massively appreciated (and potentially rewarded as mentioned!)
Edit: I've checked R2 which seemingly would be the first obvious step, but it's fine.