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by slado
Mon Dec 01, 2014 8:56 pm
Forum: Automation, sensing and robotics
Topic: Supercapacitor UPS for more power reliability
Replies: 9
Views: 6087

Re: Supercapacitor UPS for more power reliability

That is not the problem. The real problem is, that the HAT standard forces the design engineer to implement a "safety diode" in the circuit diagram that will never be used and has no function. Only when doing so, you can call the unit HAT-compliant. This is MUDA. Who will pay for the waste?
by slado
Wed Oct 22, 2014 7:27 pm
Forum: Automation, sensing and robotics
Topic: Supercapacitor UPS for more power reliability
Replies: 9
Views: 6087

Re: Supercapacitor UPS for more power reliability

Making a UPS HAT-compatible is not a good idea: The HAT standard requires a 'safety' diode in case of powering from both sides (Micro-USB and GPIO). Powering the Raspberry Pi from any other independent source besides the UPS-controlled-source would cause problems. The UPS must have full control over...
by slado
Wed Oct 22, 2014 9:24 am
Forum: Automation, sensing and robotics
Topic: Supercapacitor UPS for more power reliability
Replies: 9
Views: 6087

Re: Supercapacitor UPS for more power reliability

The mechanical drawings can be downloaded now. They are appended to the datasheet.
by slado
Fri Oct 03, 2014 6:16 am
Forum: Automation, sensing and robotics
Topic: Supercapacitor UPS for more power reliability
Replies: 9
Views: 6087

Supercapacitor UPS for more power reliability

Hi, I am working on a project which should make the Raspberry Pi a bit more "suitable for industrial use": It's a combination of a small UPS for short time power failures and a protection against brown-outs and inrush currents. The module doesn't use conventional batteries but small supercapacitors....
by slado
Tue Aug 19, 2014 6:47 am
Forum: General discussion
Topic: Raspi + UPS
Replies: 18
Views: 4106

Re: Raspi + UPS

Thanks for all the extra info - all very interesting :) Given that the Pi is specced to run okay from 4.75V, I don't suppose there's any way you could reduce your power-failure-threshold from 4.9V to 4.75V? (apologies if that's a stupid question :oops: ) If you wanted to use the mounting hole and t...
by slado
Sun Aug 17, 2014 8:42 pm
Forum: General discussion
Topic: Raspi + UPS
Replies: 18
Views: 4106

Re: Raspi + UPS

No price at the moment. There will be more variants: e.g. with different types of supercapacitors, or without supercapacitors. If you have any other requirements/wishes it is still not late to let me know. According to the "How it works" diagram, the Raspberry Pi version of the UPS has to be powere...
by slado
Sat Aug 16, 2014 7:42 pm
Forum: General discussion
Topic: Raspi + UPS
Replies: 18
Views: 4106

Re: Raspi + UPS

That sounds like an interesting option. I know about the other UPS modules, but they use batteries which require maintenance. The supercapacitor approach is what I was hoping to find as a final solution. Can I ask what provisions you have made for the case where the power goes out and then comes ba...
by slado
Fri Aug 15, 2014 9:51 pm
Forum: Automation, sensing and robotics
Topic: Safe shutdown - Simple way
Replies: 31
Views: 5366

Re: Safe shutdown - Simple way

I am working on a similar project using supercapacitors for powering the RPI while shutting down: www.juice4halt.com I have used 2x25F/2.7V supercapacitors. This is enough for supplying the RPI (average current 375mA) for about 60 seconds. The supercapacitors are discharged from 5V down to 1V. For o...
by slado
Fri Aug 15, 2014 9:42 pm
Forum: Troubleshooting
Topic: Keeping HDDs healthy (and not making them fail)
Replies: 29
Views: 10230

Re: Keeping HDDs healthy (and not making them fail)

Hot-plugging a HDD to the RPI and supplying it via USB can be reliable using a supercapacitor like in the following module:

www.juice4halt.com

Everytime the HDD spins up the RPI crashes without the module.
by slado
Fri Aug 15, 2014 9:24 pm
Forum: HATs and other add-ons
Topic: UPS kit for the Raspberry Pi.. what do you think?
Replies: 16
Views: 6660

Re: UPS kit for the Raspberry Pi.. what do you think?

Nice board. I am working on a similar problem. My solution is based on supercapacitors instead of batteries: www.juice4halt.com It is not intended to backup the RPI for hours but only for on minute to cover the shutdown time. Moreover the supercapacitors protect the RPI from short term power failure...
by slado
Fri Aug 15, 2014 9:03 pm
Forum: Beginners
Topic: Auto shutdown on power failure
Replies: 5
Views: 2953

Re: Auto shutdown on power failure

Another one using supercapacitors instead of batteries:

www.juice4halt.com
by slado
Fri Aug 15, 2014 8:56 pm
Forum: General discussion
Topic: Raspi + UPS
Replies: 18
Views: 4106

Re: Raspi + UPS

I am working on project which does everything you mentioned: www.juice4halt.com The module works without batteries, the power is stored in supercapacitors and keeps the RPI alive for about 1 minute after power failure. This should be enough time for a shutdown. Moreover the supercapacitors protect t...
by slado
Fri Aug 15, 2014 8:43 pm
Forum: HATs and other add-ons
Topic: Safe shutdown circuit using a supercap
Replies: 29
Views: 11573

Re: Safe shutdown circuit using a supercap

What about this: www.juice4halt.com The module works without batteries, the power is stored in supercapacitors and keeps the RPI alive for about 1 minute after power failure. This should be enough time for a shutdown. Moreover the supercapacitors protect the RPI from short term power failures or bro...
by slado
Fri Aug 15, 2014 8:27 pm
Forum: Automation, sensing and robotics
Topic: Controlled shutdown on power loss
Replies: 7
Views: 19127

Re: Controlled shutdown on power loss

This might be be a solution for your shutdown problem: www.juice4halt.com The module works without batteries, the power is stored in supercapacitors and keeps the RPI alive for about 1 minute after power failure. This should be enough time for a shutdown. Moreover the supercapacitors protect the RPI...
by slado
Fri Aug 08, 2014 7:46 pm
Forum: HATs and other add-ons
Topic: Access to GPIO pins on HAT
Replies: 27
Views: 5493

Re: Access to GPIO pins on HAT

And when you don't have control over something, how can you create a standard for it and why do you want to create it? What would be the added value of such definition? It's the same as any standard, like USB 2.0, The point is to define certain minimum requirement that must be met so that users wil...
by slado
Fri Aug 08, 2014 6:12 pm
Forum: HATs and other add-ons
Topic: Access to GPIO pins on HAT
Replies: 27
Views: 5493

Re: Access to GPIO pins on HAT

I think that Slado's point was that someone may want to put together a Pi + HAT for a specific application with no additional peripherals and the requirement that the HAT have a continuous supply rating over and above that needed for the Pi alone would mean that the HAT power supply is over-enginee...
by slado
Fri Aug 08, 2014 10:42 am
Forum: HATs and other add-ons
Topic: Access to GPIO pins on HAT
Replies: 27
Views: 5493

Re: Access to GPIO pins on HAT

What is the requirement for minimum current of 1.3A continuosly good for? The Raspberry Pi B+ draws less than 300mA. I could understand this requirement for a peak value but why continuosly? Is that for the peripheral devices attached to the 4 USB ports? Then you probably don't cover the worst case...
by slado
Fri Aug 08, 2014 5:42 am
Forum: HATs and other add-ons
Topic: Access to GPIO pins on HAT
Replies: 27
Views: 5493

Re: Access to GPIO pins on HAT

HAT boards are not stackable, so normally do not pass through the header pins, but for specific applications I don't see why you would not pass the pins through. However if you expect other boards to be stacked on top, in principle you then should not use any GPIO pins as it would block the stacked...
by slado
Mon Aug 04, 2014 7:35 am
Forum: HATs and other add-ons
Topic: Access to GPIO pins on HAT
Replies: 27
Views: 5493

Access to GPIO pins on HAT

Hi, is there any requirement for a HAT that the GPIO pins must stay accessible after attaching the HAT to the RPi B+ ? The HAT will contain two big supercapacitors. The position of these supercapacitors on the HAT PCB will probably make it more difficult to access the new GPIO pins (27 to 40). Will ...
by slado
Tue Jun 10, 2014 10:25 pm
Forum: Automation, sensing and robotics
Topic: Controlled Shutdown at Power Failure
Replies: 72
Views: 53621

Re: Controlled Shutdown at Power Failure

Yes, you are right. The product is not ready for production. It will be probably by the end of this year. As I am the designer of the board I must know it. Sorry for not saying this information. Just wanted to see what people think about it.
by slado
Mon Jun 09, 2014 11:06 pm
Forum: Automation, sensing and robotics
Topic: Controlled Shutdown at Power Failure
Replies: 72
Views: 53621

Re: Controlled Shutdown at Power Failure

Interesting topic. There is already a product using supercapacitors instead of batteries to backup power for the Raspberry Pi for a short time. The main difference: The supercapacitors work with their full charge, not only with a small change of charge around the 5V. A step-up/step-down converter is...

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