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Forum Index : Microcontroller and PC projects : Raspberry Pi 3
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| JohnS Guru  Joined: 18/11/2011 Location: United KingdomPosts: 4038 |
As I've not noticed it on here, just in case anyone missed it... https://www.raspberrypi.org/blog/raspberry-pi-3-on-sale/ Apparently they've now sold over 8 million RPi boards. John |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2934 |
One thing negative about the RPi3 when using in embedded solutions is the power requirements. They suggest a 2.5A PSU as the 2.1A may not be enough!!! Otherwise a nice product; and it will sell well as it is available in stock (as opposed to very limited PiZero availability). |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4038 |
Well they say they're recommending that "if you want to connect power-hungry USB devices". edit: thinking more, the RPi3 has built in WiFi and Bluetooth so you're quite likely to use fewer USB devices. Of course it's unlikely to be very low power as it's a quad core 1.2GHz chip... John |
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| WhiteWizzard Guru Joined: 05/04/2013 Location: United KingdomPosts: 2934 |
I am trying to find spec sheet regarding how much it pulls - if anyone has a link then please post 
Not knocking the RPi at all (I think it is an absolute bargain and a great product) but for use as part of an embedded solution I think it is not the most ideal product if they are recommending a 2.5A PSU. Perhaps my years spent designing Ultra Low power solutions has 'biased' my opinion. 
Imagine, if you add a screen and some 'other' hardware, then could be requiring a 3Amp PSU just to flash a couple of LEDs (processing power overkill accepted!). I use a wireless RPi zero in partnership with a MicroMite creating an internet streaming radio (with Geoff's LCD 2.8" BackPack for the GUI), also the uM28 has a wireless console (for remote coding). All of these things run smoothly on a 5v 1.2A PSU. Switching to a RPi3 would require a PSU with at least double the power capability! But as a small linux computer it will do very well IMHO . . . Wonder what Eben will bring out next 
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| astroboy Regular Member  Joined: 28/12/2014 Location: AustraliaPosts: 41 |
Not a spec sheet but tested here and here (scroll down) |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
I'm a little disappointed they did not elect to put in Gb ethernet, but then, I guess you have to compromise somewhere. Gb ethernet would have made the Pi3 a good candidate for simple and cheap(but still fast) NAS boxes. You can still use the Pi as a NAS of sorts, but the 100-speed network slows it down too much.(although I still have a flash-drive hanging off my Pi2 mediaplayer, which is used as one of a couple of backup locations on my network) But then, the Pi was never designed to be used as a NAS, so I am probably expecting too much! Smoke makes things work. When the smoke gets out, it stops! |
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| robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2437 |
in the RPi 2 the ethernet and 4x external USB ports are attached to the processor via a single USB 2 port, which i'm picking would preclude running ethernet at gigabit speeds. i assume the internal port is still USB 2 on the RPi 3. cheers, rob :-) |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9593 |
Good point. 
100-speed ethernet is still OK for files that are not too huge. The flash-drive on my Pi2 mediaplayer is mapped as a network drive to my Win8 machine, and I save all my daily work to this flash drive, this local PC, another computer on the house network, and Dropbox too. Multiple-redundant-backups, in other words. The Pi2 handles saving these smaller files just fine. It only gets upset if you send it really big files, or multiple small files at once. Smoke makes things work. When the smoke gets out, it stops! |
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| srnet Senior Member  Joined: 08/08/2014 Location: United KingdomPosts: 164 |
"The Pi Zero draws a ridiculously small amount of current when idle (50mA) and even when computing primes on a single core it only peaks at 120mA. The Pi 2 idles at around 200mA which increases to 360mA when computing primes" $50SAT is Silent but probably still working. For information on LoRa visit http://www.loratracker.uk/ |
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| astroboy Regular Member Joined: 28/12/2014 Location: AustraliaPosts: 41 |
Another power consumption test and interesting discussion comparing all RPis from Raspi.tv |
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| plasma Guru Joined: 08/04/2012 Location: GermanyPosts: 437 |
ive got one . if you have an old rpi so buy the new one. if you have an pi2 i think to buy an rpi3 isnt needed. my rpi3 runs with my 2,1 A powersource. |
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