Powering mote 24/7 using only a supercap and solar
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@Ed1500 said in Powering mote 24/7 using only a supercap and solar:
@NeverDie actually I have done that, feeding an attiny85 and also an Atmega328 ("barebones" arduino) 2x1.5F capacitors. all on a 6 volt solar cel and a low drop regulator
Exactly which supercaps are you using, and where are you sourcing them from? It would be good to compare notes.
@NeverDie I have 5.5V 1.5F Supercaps from Aliexpress. Forgot which supplier but they do well.
I put them in an RC circuit to measure and though that might not be totally reliable, they were above 1 Farad
Ah, found them. Although. It was a year ago, the ones I have say 1.5 F but seems they now sell 1Farad
These: https://www.aliexpress.com/item/2Pcs-Ultracapacitor-1-5F-5-5V-super-capacitor-1-5Farad-farad-capacitor-5-5V1-0F/32632431698.html -
@NeverDie I have 5.5V 1.5F Supercaps from Aliexpress. Forgot which supplier but they do well.
I put them in an RC circuit to measure and though that might not be totally reliable, they were above 1 Farad
Ah, found them. Although. It was a year ago, the ones I have say 1.5 F but seems they now sell 1Farad
These: https://www.aliexpress.com/item/2Pcs-Ultracapacitor-1-5F-5-5V-super-capacitor-1-5Farad-farad-capacitor-5-5V1-0F/32632431698.html -
@Ed1500 Yep, rechecked mine. 1.5 Farad, but the 'my orders' link now points to 1 Farad caps
Thanks for looking that up. I keep coming back to this one:
https://www.digikey.com/product-detail/en/illinois-capacitor/106DCN2R7M/1572-1287-ND/5410638
if only because it seems like a good value for money, and it seems able to run any mote for quite a long time. -
Thanks for looking that up. I keep coming back to this one:
https://www.digikey.com/product-detail/en/illinois-capacitor/106DCN2R7M/1572-1287-ND/5410638
if only because it seems like a good value for money, and it seems able to run any mote for quite a long time. -
Good point. I use first class mail from digikey, which arrives in 2 days and which costs around $3.65 I think. If you order before 8pm, it ships the same day. So for me, since I usually order late in the day, it's almost like it arrives in a day and a half. :) I don't think I would order just a single supercap from Digikey, unless I was getting a bunch of them, but as I'm ordering a lot of parts from Digikey anyway, the incremental shipping cost is typically free.
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Good point. I use first class mail from digikey, which arrives in 2 days and which costs around $3.65 I think. If you order before 8pm, it ships the same day. So for me, since I usually order late in the day, it's almost like it arrives in a day and a half. :) I don't think I would order just a single supercap from Digikey, unless I was getting a bunch of them, but as I'm ordering a lot of parts from Digikey anyway, the incremental shipping cost is typically free.
@NeverDie realise though it is 2.7 Volts
sure, 3.65 is peanuts if you order a bunch.
I see they have a branch in Netherlands as well. I would pay 1.81 euro for that capacitor.. but I would pay an unbelievable 18 euro shipping? Apparently because they still ship it from the USA. Also, need to answer a bunch of question what I am going to use it for, will i resell it etc. ... So I guess DigiKey is not a viable option for me -
Don't complain about your shipping costs from Digi-Key guys. These are the rates for me, insane ! :o
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I should point out that even without a boost converter, I'm getting good charging indoors in most locations. I've been investigating boost converters just in case I want a node that's virtually bulletproof with respect to charging from low light conditions, or which needs to power 3.3v or 5v sensors. For instance, the banggood PIR sensor on the other thread requires between 2.7v and 3.3v to power it. It uses so little current though that it should be possible to power it continuously from even a solar node, so I'll be attempting that fairly soon. Obviously, doing it outdoors is nothing new and would be a piece of cake by comparison.
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Don't complain about your shipping costs from Digi-Key guys. These are the rates for me, insane ! :o
Isn't there some place in Vietnam that stocks parts for re-sale so you don't have to order internationally and pay usurious shipping rates? Or is there just not enough demand to support that? Surely, China must have good options for you beyond just Aliexpress.
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Don't complain about your shipping costs from Digi-Key guys. These are the rates for me, insane ! :o
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Isn't there some place in Vietnam that stocks parts for re-sale so you don't have to order internationally and pay usurious shipping rates? Or is there just not enough demand to support that? Surely, China must have good options for you beyond just Aliexpress.
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@gohan said in Powering mote 24/7 using only a supercap and solar:
I ordered the 5.5v 4F ones, I hope they arrive sooner or later
That could be interesting. Do you have a link?
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@NeverDie Actually I had expected that for DigiKey Europe as well... but it says 'all shipping from USA'
Well, China also has Banggood ;-)@Ed1500 said in Powering mote 24/7 using only a supercap and solar:
@NeverDie Actually I had expected that for DigiKey Europe as well... but it says 'all shipping from USA'
Well, Europe has a Mouser.com presence, I think. Plus, surely there's other stuff there, like in Germany or the UK or something.
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You are right @Ed1500, I receive so many shipments from AliExpress that now the postman is fed up with puting non-delivery notices in my mailbox, now he leaves the packages at the management office of my building, where they advance the tax for me when needed :)
@NeverDie yes I have some local shops, with very cheap delivery options, less than 1$ a;nd delivered the next day when they have stock. But unfortunately the inventory is pretty limited, I use them when the price difference is not worth the wait from AliExpress.
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@Ed1500 said in Powering mote 24/7 using only a supercap and solar:
@NeverDie Actually I had expected that for DigiKey Europe as well... but it says 'all shipping from USA'
Well, Europe has a Mouser.com presence, I think. Plus, surely there's other stuff there, like in Germany or the UK or something.
@NeverDie Oh dont worry, plenty of local online shops here for electronic components plus distributors for adafruit and similar.
However, I can order in china and have it delivered to my door often for less money than just the gas would cost me to drive to a local store, or to have it delivered from a local webstore.
The only thing is that sometimes I have to wait 2-3-4 weeks -
These look quite inexpensive:
https://www.aliexpress.com/item/30-x-ultra-capacitor-2-7v3f/32570929215.html?spm=2114.10010108.1000023.15.qq5cZ7
