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

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Re: [SOLD OUT] Safe Shutdown v1.2 (for PowerBoost)

Post by Camble » Mon Aug 14, 2017 4:16 pm

RogerX wrote:
Mon Aug 14, 2017 12:57 pm
Assuming I have no qualms with removing the 200K Enable, 1) Where is this component and 2) What are the potential risks?
Either de-solder the resistor outlined in red, or cut either of the traces marked in orange. This means you can default EN to ground, and power on by pulling EN high (usually to Vs).

Cutting the trace is probably the least risky option.

I guess if people wanted, I could do a "mod" version of the Safe Shutdown? Personally, I'll probably make this modification if I can't get a working solution using a JFET.

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It should go without saying that I'm not responsible for you damaging your PowerBoost. ;)

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Re: [SOLD OUT] Safe Shutdown v1.2 (for PowerBoost)

Post by AWildTyphlosion » Tue Aug 15, 2017 6:44 am

Camble wrote:
Mon Aug 14, 2017 4:16 pm
...
Cutting the trace is probably the least risky option.
...
Seems like an easy enough modification to do :P

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Re: [SOLD OUT] Safe Shutdown v1.2 (for PowerBoost)

Post by RogerX » Tue Aug 15, 2017 7:26 am

Camble wrote:
Mon Aug 14, 2017 4:16 pm
I guess if people wanted, I could do a "mod" version of the Safe Shutdown? Personally, I'll probably make this modification if I can't get a working solution using a JFET.
That also sounds like a compelling option, would that be something you could share details on?
It should go without saying that I'm not responsible for you damaging your PowerBoost. ;)
Understood, I'm looking at a stack of 8 expensive new 1000Cs and find myself unsure on making the mod...
-RogerX
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Re: [SOLD OUT] Safe Shutdown v1.2 (for PowerBoost)

Post by Camble » Tue Aug 15, 2017 8:33 am

RogerX wrote:
Tue Aug 15, 2017 7:26 am
Understood, I'm looking at a stack of 8 expensive new 1000Cs and find myself unsure on making the mod...
The good thing is it's really easy to revert it back, you just bridge EN and Vs with a resistor. 10k, 100k, 200k, doesn't really matter.

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Re: [PRE-ORDER] Safe Shutdown v1.2 (for PowerBoost)

Post by musty_666 » Wed Aug 16, 2017 6:16 am

Do you have a wiring diagram in image to the Safe shutdown?

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Re: [PRE-ORDER] Safe Shutdown v1.2 (for PowerBoost)

Post by silentjames » Fri Aug 18, 2017 4:42 am

musty_666 wrote:
Wed Aug 16, 2017 6:16 am
Do you have a wiring diagram in image to the Safe shutdown?
I created the diagram using Helder's board, but this might be useful, I hope.
SpoilerShow
Image

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Re: [PRE-ORDER] Safe Shutdown v1.2 (for PowerBoost)

Post by YaYa » Fri Aug 18, 2017 5:40 am

I have a question Camble...
I'm currently planning a new project were i will use a 26Ah Li-ion battery for powering the components. It's a bartop in a special shape.
I will draw around 2A current and charging will throw 1.5A.
Can your board handle such a configuration ?
I need to push one switch to activate a safe shitdown command to the Pi and then powering off the screen, the sound amp, and the power supply.
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Re: [PRE-ORDER] Safe Shutdown v1.2 (for PowerBoost)

Post by jsawhite » Fri Aug 18, 2017 6:10 am

YaYa wrote:
Fri Aug 18, 2017 5:40 am
I have a question Camble...
I'm currently planning a new project were i will use a 26Ah Li-ion battery for powering the components. It's a bartop in a special shape.
I will draw around 2A current and charging will throw 1.5A.
Can your board handle such a configuration ?
I need to push one switch to activate a safe shitdown command to the Pi and then powering off the screen, the sound amp, and the power supply.
All his board does is essentially control the enable pin on the powerboost. The supply power doesn't go through it, it goes through the powerboost. So current draw is not relevant to this board. You are only limited to the current your power supply can source (powerboost is 1A).

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Re: [PRE-ORDER] Safe Shutdown v1.2 (for PowerBoost)

Post by YaYa » Fri Aug 18, 2017 6:18 am

jsawhite wrote:
Fri Aug 18, 2017 6:10 am
YaYa wrote:
Fri Aug 18, 2017 5:40 am
I have a question Camble...
I'm currently planning a new project were i will use a 26Ah Li-ion battery for powering the components. It's a bartop in a special shape.
I will draw around 2A current and charging will throw 1.5A.
Can your board handle such a configuration ?
I need to push one switch to activate a safe shitdown command to the Pi and then powering off the screen, the sound amp, and the power supply.
All his board does is essentially control the enable pin on the powerboost. The supply power doesn't go through it, it goes through the powerboost. So current draw is not relevant to this board. You are only limited to the current your power supply can source (powerboost is 1A).
Thanks for the reply. I'm in fact not intended to use the powerboost due to his limited current draw ability.
Instead i'll go for this unit
5V 2.1A Charge Discharge boost Power Module 3.7V 4.2V li-ion 18650 LED battery

The features :
Charge voltage : DC 4.5V-5.5V(Recommend DC 5V) <--- Perfect as i'll use a AC/DC 5V regulated power supply (10A)
Charging current : 0-2.1A <--- Perfect to charge 26Ah
Charge quiescent current : 100uA
Full charge voltage : 4.2V+-1%.
Discharge current : 0-3.5A; <--- Not used
Discharge quiescent current : 50uA
Discharge conversion efficiency : maximum 96%
Output voltage : 5V
Output current : 0-2.1A; <--- Good to power everything through it
Operating ambient temperature : -20° to +85°
Size : 26.7 x 18.1 x 5.7mm
Weight : 1.9g

If anyone know another unit that can sustain higher current drain and higher charge capacity, i will be in. I don't know how to search on Aliexpress, and the only one i found is this unit which seems to be good.
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Re: [PRE-ORDER] Safe Shutdown v1.2 (for PowerBoost)

Post by Camble » Sat Aug 19, 2017 3:56 am

@YaYa The alternative is this. The traces are rated for 1A and I've tested it at 1.5A. I wouldn't put any more than that through it. Maybe there's a demand for a higher rated version.

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