Author Topic: Raspberry Pi 3  (Read 14996 times)

0 Members and 1 Guest are viewing this topic.

Offline Monkeh

  • Super Contributor
  • ***
  • Posts: 8073
  • Country: gb
Re: Raspberry Pi 3
« Reply #25 on: March 01, 2016, 11:48:24 pm »
I never said it was mine. Far better things to spend money on..
 

Offline timb

  • Super Contributor
  • ***
  • Posts: 2536
  • Country: us
  • Pretentiously Posting Polysyllabic Prose
    • timb.us
Re: Raspberry Pi 3
« Reply #26 on: March 02, 2016, 12:34:12 am »

Wait, what? Soft UART?! Really?! Christ on a Cracker. Most SoCs have like a ton of UARTs (the Sitara on the BBB has at least 5 full UARTs with hardware flow control for example) so I assumed the BCM would have at least two. How could they think this was a good idea? Talk about amateur hour...

For twice the price?

This was a SoC originally designed for mobile phones. Phones which usually contain more than one radio, with each radio requiring a UART for baseband or firmware programming. (Some units can do it over SPI or other high speed links now, but it wasn't common when this SoC was originally designed.)

I don't have access to this BCM's TRM, but I assume it does in fact have multiple UARTs. If I had to guess, I'd say either they originally planned to share the single UART between the BT module and header *or* it was an afterthought. Maybe they had routing issues? Or pin assignment problems. It could even be a bug in the SoC.

Whatever the reason, it seems like a glaring oversight. To be honest, I'm surprised they went with a UART based BT module. SPI is very common for BT modules. Hell, they could have even used a combo BT/WiFi chip that talks over the memory interface! (Those are expensive though, so I can understand why they didn't.)

There's a nice Maxim SPI to UART bridge chip that even has a Linux driver. I should design and sell a hat with a couple of those on it. I bet it would sell well now.
Any sufficiently advanced technology is indistinguishable from magic; e.g., Cheez Whiz, Hot Dogs and RF.
 

Offline R_Gtx

  • Regular Contributor
  • *
  • Posts: 52
  • Country: gb
Re: Raspberry Pi 3
« Reply #27 on: March 02, 2016, 12:39:24 am »
That is one toasty die. Under what conditions was that achieved?

The new RPi3 should pull 0.65A @ 5V when loaded fully, most of which will be dissipated in the CPU. That's 3.2 watts.

There is a discussion here
 

Online tszaboo

  • Super Contributor
  • ***
  • Posts: 7988
  • Country: nl
  • Current job: ATEX product design
Re: Raspberry Pi 3
« Reply #28 on: March 02, 2016, 09:27:02 am »
I'll just leave this here.
So now, not only do you need a plastic case, and external non-standard  (2.5A) USB "charger" a powered hub, an SD card adapter, an SD card, bunch of software,  to have a very slow computer, but also a heatsink. And a ton of time to make a usable operating system, which will still lack space, usability, since it is either a crippleware widows or linux.

Meanwhile in a parallel universe, mini pcs are sold for 150 Euros. Or used pcs are picked up for free.
Makes total sense. At least they soldered the header.
 

Offline atcurtis

  • Newbie
  • Posts: 3
  • Country: us
    • Making
Re: Raspberry Pi 3
« Reply #29 on: March 02, 2016, 09:45:07 am »
I am personally more interested if a 3 A model comes out with bluetooth/wifi.
Given the stock of Pis I have, I think I will probably not get a 3 B unless if I actually need it.
 

Offline problemchild

  • Newbie
  • Posts: 3
  • Country: gb
Re: Raspberry Pi 3
« Reply #30 on: March 02, 2016, 09:58:44 am »
I think the 2.5 A is a potential feature as  this was more about how much current the unit could deliver to the USB peripherals rather than what it required for it's self. That said you will still need to get the big 5V PSU out to power it as you said. The real PITA is that most of those larger 5V supplies have a DC Jack rather than a micro USB... think I may have a few 2 A units at home! L8R!

I'll just leave this here.
So now, not only do you need a plastic case, and external non-standard  (2.5A) USB "charger" a powered hub, an SD card adapter, an SD card, bunch of software,  to have a very slow computer, but also a heatsink. And a ton of time to make a usable operating system, which will still lack space, usability, since it is either a crippleware widows or linux.

Meanwhile in a parallel universe, mini pcs are sold for 150 Euros. Or used pcs are picked up for free.
Makes total sense. At least they soldered the header.
 

Offline problemchild

  • Newbie
  • Posts: 3
  • Country: gb
Re: Raspberry Pi 3
« Reply #31 on: March 02, 2016, 10:03:42 am »
Ha Forgot to put a link to my RPI 3 vid ... Only first impressions at the moment since I'm stuck in my Hotel until Thursday night when I'll do more in depth stuff
 

Offline TonyPh

  • Regular Contributor
  • *
  • Posts: 72
  • Country: gb
Re: Raspberry Pi 3
« Reply #32 on: March 02, 2016, 08:32:09 pm »
Tempted to get one to replace the Pi B I use on my TV in the bedroom. Thing is the Pi B does everything I need of it....

I could also replace the Odroid C1 I use downstairs but that does everything I need of it too, and does Gigabit ethernet...

Was poised over the buy button but sense prevailed. Will buy when I find a reason to buy. Pi 4 maybe.
 

Offline briandorey

  • Regular Contributor
  • *
  • Posts: 51
  • Country: gb
    • Project Blog
Re: Raspberry Pi 3
« Reply #33 on: March 02, 2016, 09:38:20 pm »
After spending most of the day trying to get the serial console to work via the GPIO header and using a script from https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=138223 to remap the hardware uart from the bluetooth module to the GPIO pins, its time to give up and stick with using the Pi 2 for projects until they sort out the overheating issues and broken serial support :(

Even with the Pi 3 just using a ssh console the processor is getting too hot to touch. On the plus side i can always use it to keep the cup of tea warm :)
 

Offline timb

  • Super Contributor
  • ***
  • Posts: 2536
  • Country: us
  • Pretentiously Posting Polysyllabic Prose
    • timb.us
Re: Raspberry Pi 3
« Reply #34 on: March 02, 2016, 11:28:56 pm »
Just get a small heatsink. I've always used the 1"X1" solid copper heatsinks for my Pis. You can buy them in 8 packs for less than $10 on Amazon.
Any sufficiently advanced technology is indistinguishable from magic; e.g., Cheez Whiz, Hot Dogs and RF.
 

Offline Stonent

  • Super Contributor
  • ***
  • Posts: 3824
  • Country: us
Re: Raspberry Pi 3
« Reply #35 on: March 04, 2016, 03:50:13 pm »
Does this one have the reboot with camera flash feature?
The larger the government, the smaller the citizen.
 

Offline fantis1337

  • Contributor
  • Posts: 23
  • Country: is
Re: Raspberry Pi 3
« Reply #36 on: March 04, 2016, 04:10:52 pm »
Not gonna bother with the newest pi. Have my pi2 that has worked wonders for the projects I have used it on.
If you run into an asshole in the morning, you ran into an asshole.
If you run into assholes all day, you’re the asshole.
 

Offline Fred27

  • Supporter
  • ****
  • Posts: 727
  • Country: gb
    • Fred's blog
Re: Raspberry Pi 3
« Reply #37 on: March 04, 2016, 04:20:18 pm »
I doesn't seem to be about need.

Nobody *needed* a Pi Zero. Unless you were ready to go with a finished design that needed to be smaller, an existing Pi would do the job. That didn't stop them selling out though.
 

Offline stejep

  • Contributor
  • Posts: 20
  • Country: au
Re: Raspberry Pi 3
« Reply #38 on: March 05, 2016, 05:13:26 am »
I have too many of these things already, the original Pi, the Pi 2, a couple of Udoo's, oh the Pi Nano, and waiting on the Pine A64 from kickstarter.

I think I am going to stop, looks like there are too many of these things coming out of the wood work and they are just getting better. If we wait say a year, what are they going to be doing ?
 

Offline Kilrah

  • Supporter
  • ****
  • Posts: 1852
  • Country: ch
Re: Raspberry Pi 3
« Reply #39 on: March 05, 2016, 07:12:01 am »
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf