[TriEmbed] measuring low power (Joulescope)

[Christopher Svec]

 Hi Pete & Triembed,
My friend has a beta of the Joulescope and he says it works great. Also, Joulescope's creator Matt Liberty was on this week's Embedded podcast: https://www.embedded.fm/episodes/278
I'm going to buy one in the kickstarter for my own consulting work. I expect I'll be using it ~50% of any given year, and I'm happy to share it with others in the group too if scheduling works out.
-svec
    On Friday, February 15, 2019, 11:56:16 AM EST, Pete Soper via TriEmbed <triembed at triembed.org> wrote:  
 
   
I've been using a TI XDS110 (about $110) that has an "EnergyTrace" feature that can run standalone within TI's Eclipse-based Code Composer Studio. This allows measuring supply current to a target with programmable voltage. It will supply up to 100mA at 1.8 to 3.6 volts. The accuracy is +/-2% or +/-500nA at less than 25mA and 5% from 25 to 100mA and I have an "extender" add-on (another couple hundred $) that stretches the current range up to (from memory) 800mA. The CCS IDE in this setting is just a huge Java GUI glop for enabling the XDS110 and slurping roughly 2k samples per second into a .csv file (and yes, it holds these bad boy sample collections in memory until the run is complete and this would be a major issue for monitoring for long periods of time if you don't happen to have 128 gigabytes of RAM in your  computer).  The XDS110 is only about $110 and has been extremely effective for what I've been doing, but I need something that measures an arbitrary power source with an arbitrary target.
 
 
There's a Kickstarter that's going live on the 19th offering a device called Joulescope that is passive: it measures whatever voltage and current is going to a target. It covers nine orders of magnitude from -1 to 15 volts and -1 to 3A with  1.5nA resolution and 250kHz bandwidth. The software and front panel connector design is open source. For an in depth description of this by the creator here's an interview on embedded.fm.
 
 
My question is whether another TriEmbed person would like to share one of these with me. We can get one of the "earlybird" first production units for $400 so that would be $200 each. If you're interested in this, please email me direct (pete at soper dot us). I'm outside Apex and a long hike from everywhere, so this wouldn't be like sharing a lawnmower with a neighbor, but I'm not in a low power-centric business, so I wouldn't be in a position to use this thing for weeks or even months at a time (but I wish I had it today!). The production schedule is early June. The guy involved seems to have done his homework: there doesn't appear to be any development at all left  for him to do, just the production so it appears to be relatively low risk, but of course you can never tell.  So if you're seriously interested, let me know.
 
 Thanks,
 Pete 

 
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