Does anybody know this two packages practically? They seem to be very expensive but very useful also. I think about buying CrowPi2 for creating a mobile hard- and software-solution for "universal control" - from temperature to movement until radioactivity and subsonic.
FW
"Universal learning" looks more like it. My instant reaction is that it is probably OK for learning basic electronics and programming, but:
- if you want to build some sort of self-designed a gadget you'd be better off buying a bare RPi, Pico or even (gasp!) a PICAXE chip because they will be easier to build into your project than stealing bits from a CrowPi2 would be.
- if you're more interested in programming than assembling hardware, pick up a decent Lenovo laptop from eBay and install a Linux distro on it or go for a Pi400 and add a storage drive, mouse and screen. Both suggestions should be cheaper than the CrowPi, especially the first option, even if you need to get a used laptop for use as your workstation.
-- Martin | martin at Gregorie | gregorie dot org
True. A lot cheaper. This is just a fancy box. You can get HUGE amounts of gadgets for your bare PI. And maybe get even a small 3D printer to print all the boxes. :P
Am 03.05.2021 um 13:31 schrieb Nikolaj Lazic:
Okay, thank you both. I own already a Pi 400 and am interested in understanding f. e. reading temperature-sensors oder driving a
7-segment-display.For both I would prefer C knowing it for several years. Python looks interesting but I feel too old for this "new stuff" ;-)
BTW: Does anybody know the .h-Files for GPIO? Can I find it in the books delivered with the 400?
So I will try to get an "external breadboard" (if possible) and connect it to the GPIOs of my 400. Maybe this is more useful.
Thank you again!
FW
On Mon, 3 May 2021 11:31:07 -0000 (UTC), Nikolaj Lazic declaimed the following:
Does the CrowPi2 even have a box -- the web page I saw looked lik it was just a keyboard/display with a lot of assorted components on break-out boards. The first CrowPi appeared to just be an electronic experimenters set inside an briefcase with display and spot for R-Pi.
For plain sensors on break-outs, many of the Arduino component sets are applicable (analog sensors would need an external A/D converter -- or use a Beaglebone Black instead of the R-Pi). cf:
-- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/
Agreed. These days I find I prefer Java as a general programming language BUT its really only useful for handling files/databases/kbd/screen/ networking - you need C to deal with RS232. etc.
Rust might be worth a look as it seems somewhat more bullet-proof that C: its on my list of things to look at.
No idea, sorry.
Yes, breadboards are good news. Also, I don't know if they're still around, but you used to be able to find 'solderable breadboards' - single- sides PCBs about 100 x 150mm in size, predrilled and printed with rows of standard IC soldering pads with positive and ground rails in between them. Very useful for making one-off projects after you've debugged them on a breadboard.
PICAXE also sell small breadboards and solderable prototyping boards for their chips (which run a fairly unexciting BASIC thats tailored to the PIC architectute (short, unsigned integers etc) but their BASIC compiler runs well on a Pi 2B under an emulator.
There may now be similar small boards for Pi PICO - I haven't looked. The PICO looks much more capable than any of the PICAXE chips, if a bit pricier.
-- Martin | martin at Gregorie | gregorie dot org
On Mon, 3 May 2021 16:32:17 +0200, "F. W." declaimed the following:
That likely depends upon which GPIO library one is using... Probably none if using raw sysfs access. cf:
"pigpio" (uses a daemon program, pigpiod, to let user-mode programs talk to kernel GPIO). see:
How does the extension pin/socket compare to a regular R-Pi (say a 3B)? If they are the same, you might like to obtain something like:
-- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/
I do not think the packages are very expensive - at least the price for the CrowPi2 shows here $299,- For what they offer it is worth it - IMO only the screen + RPi4B would cost about 120-150, the rest of the hardware, microcontrollers etc + some profit and some taxes ... you get manuals and some stuff on top + you know things fit together. It could be it is expensive in some countries, but then RPi4 + a screen would be also expensive there. I rate it as reasonable for example as present for a 12-14y/o. FYI it seem to have cost 600+
On the other hand as it was pointed here, if you do not need a special design etc, it is more fun to build something yourself.
Yes, there are any number of these with varying pitches, some with two pitches on the same board. I've just bought a tiny one to carry an
8-pin SSOP and plug into 0.1" DIL. SOICs can just about be used on standard 0.1" board if you cut the tracks in half.Roth (German) are fairly prominent in this line, though somewhat more expensive than China via Ebay, as you would expect. Hobbytronics and Adafruit also sell some, along with many other hobby electronics companies.
I still have a TDec which must be fifty years old and was quite expensive, but the 0.1" push-in breadboards now are very cheap.
-- Joe
No, most of the common docs only deal with Python.
IF you are a competent C programmer with low level experience, then you may be interested in source code they provide for the raspi-gpio utility they provide ...
I just used that to get the idea and wrote my own stuff.
If you are interfacing to "standard" type interfaces, e.g. I2C, RS232 etc, then just use standard linux kernel facilities. I've written code for the 16 bit IOexpander chip MCP23017 that after a recompile just works on any linux board with I2C support. And I've RS232 code that has essentially worked on Unices and Linux for over 20years (modulo suppressing the increasing number of warnings that each successive version of gcc seems to spit out - but that could be my code style :-)
Happy programming :-)
Look here and pick the approach that suits you best:
That page is a bit old though, some of the suggested libraries might not support the Pi 400.
-- __ __ #_ < |\| |< _#
Am 03.05.2021 um 23:16 schrieb Jim Jackson:
That's great. Thank you! I am not that experienced with RPi. But now I can learn more simply from the source-code...
FW
Am 04.05.2021 um 00:50 schrieb Computer Nerd Kev:
Thank you! There is in fact a kind of beauty within source-code...
FW
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