[FOR SALE] Safe Shutdown v1.2 (for PowerBoost)

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lordluca
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by lordluca » Sun Apr 16, 2017 3:40 pm

Hi! Is there a way to connect external led that will light up when there is low battery power?
Btw ordered 2 powerboost :)

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Camble
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by Camble » Mon Apr 17, 2017 1:23 am

lordluca wrote:
Sun Apr 16, 2017 3:40 pm
Hi! Is there a way to connect external led that will light up when there is low battery power?
Btw ordered 2 powerboost :)
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.

McGyver
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by McGyver » Mon Apr 17, 2017 1:51 am

Just extend the existing LEDs on the Powerboost board. Maybe desolder the original ones, extend the solder pads by wires and install new LEDs wherever you want. I did this for charging and low bat. I used flat head 3mm types from ebay.

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Thump52
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by Thump52 » Mon Apr 17, 2017 12:33 pm

Camble wrote:
Mon Apr 17, 2017 1:23 am
lordluca wrote:
Sun Apr 16, 2017 3:40 pm
Hi! Is there a way to connect external led that will light up when there is low battery power?
Btw ordered 2 powerboost :)
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.
Gus 8-)

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fraggle
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by fraggle » Mon Apr 17, 2017 2:01 pm

Just ordered. Looks really well made and the price is good too! Top work dude!

McGyver
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by McGyver » Mon Apr 17, 2017 2:14 pm

Just from the logic point of view: if the battery is low, the raspberry will start the shutdown procedure... So there is actually no need for low bat LED, or? I man: low but is the indicator for trigger the shut-down circuit. From this point of view there is no need for a low bat LED. Just in case the shutdown function is not working, you could monitor the battery situation.

bladerunner
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by bladerunner » Tue Apr 18, 2017 9:15 pm

Stupid question but do I need to solder the DPDT switch to the shutdown board or just crimp the little tabs onto it?

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Camble
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by Camble » Wed Apr 19, 2017 1:57 am

bladerunner wrote:
Tue Apr 18, 2017 9:15 pm
Stupid question but do I need to solder the DPDT switch to the shutdown board or just crimp the little tabs onto it?
The switch will need soldered on.

Quatrerwin
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by Quatrerwin » Wed Apr 19, 2017 6:00 pm

Camble wrote:
Mon Apr 17, 2017 1:23 am
lordluca wrote:
Sun Apr 16, 2017 3:40 pm
Hi! Is there a way to connect external led that will light up when there is low battery power?
Btw ordered 2 powerboost :)
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.
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.

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abrugsch
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Re: [For Sale] Safe Shutdown v1.2 (for PowerBoost)

Post by abrugsch » Thu Apr 20, 2017 3:05 am

Quatrerwin wrote:
Wed Apr 19, 2017 6:00 pm
...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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