RE: BBC micro:bit Power Supply Analysis

mp2100 — Sat, 30 Jun 2018 03:05:47 GMT

Thank Douglas for this. I see it's 2 years old, but very useful. There was a sale on the "micro:bit go" package, so I did an impulse buy. The "go" package come with a 2 x AAA battery case with a JST connector on it for the micro:bit. I've been using the JST connector on my LiPo batteries, and based on that I *was* going to strap a LiPo onto the micro:bit and have a portable temperature monitor. But at 4.2 v fully charged, now that sounds like a bad idea.

Has anyone used the micro:bit with a LiPo battery successfully? How sensitive is this little computer to voltage?

Good point about wiring the battery to the micro USB, I'll probably try that:

I could connect my 4.2 volt battery safely to the USB connector, but this will apply power to both MCUs and the power indicator LED, which will deplete the battery faster. Also I am not sure in what state the NXP MCU will put the Nordic MCU if I do this.

But if the second MCU, the Nordic MCU, isn't powered by the battery (and is powered by USB), what do you suppose is the purpose of that MCU?

RE: BBC micro:bit Power Supply Analysis

Workshopshed — Thu, 07 Jun 2018 10:36:22 GMT

What kind of diodes only have a 0.1v drop? Do they have other restrictions?

RE: BBC micro:bit Power Supply Analysis

DAB — Tue, 29 Nov 2016 19:26:02 GMT

Very good post Douglas.

I liked your detailed description of your approach and your analysis of the device to plan your testing.

DAB