Btw ordered 2 powerboost
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Not something I've experimented with yet, but you may be able to connect an LED between 3.3v and LBO. As LBO drops to ground, the LED should light. I'll investigate further.
Hello Camble, I have been using your safe shutdown switch on my gbz projects and love them, I just wanted to see can incorporate a battery indicator in your safe shutdown switch, that will be really nice, just an idea? thanks.
The switch will need soldered on.bladerunner wrote: ↑Tue Apr 18, 2017 9:15 pmStupid question but do I need to solder the DPDT switch to the shutdown board or just crimp the little tabs onto it?
The schematic for the powerboost has a PNP transistor with the base on the LBO pin, collector on the LED/1k resistor, and emitter on VBAT. Note that the LBO pin by default is pulled up to VBAT, so it can go as high as 3.7V, which could cause a reverse voltage situation.
How is that a problem for a low battery diode? if VBAT is high then we don't want the LED on, and in a reverse voltage situation (3.7-3.3 = 0.4v) then the LED won't light, just like it won't light until LBO goes below [3.3-LED activation voltage]
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