Recently, I have been developing a watch (miniature) version of ClockSquared. One of the main challenges for this device is to achieve good battery life while not making the watch excessively large or hard to use. This can be achieved by taking various power-saving measures that I will discuss in a future post, but what I will discuss today is way to actually verify that the watch’s power consumption is sufficiently low while in use and while in “sleep mode”.
Dave Jones, the author of EEVBlog, developed a great little device that enables the user to measure electrical currents (in ampere), all the way from the pico scale to the base scale. The main advantage of this device is that it does this with very low burden voltage, a concept which is nicely explained by Dave Jones himself here, or by Andreas Spiess here.
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