Go to advanced search

by Frank Buss
Sat Feb 25, 2012 12:06 am
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 109992

Re: Gertboard

<r>There are services, who do all the work for small batches and it is not too expensive:<br/> <br/> <URL url="http://www.seeedstudio.com/propagate/">http://www.seeedstudio.com/propagate/</URL><br/> <br/> and there are other services to be sure that you really have the required number of buyers to b...
by Frank Buss
Wed Feb 15, 2012 1:32 pm
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<t>I've updated my website with an Arduino example. And I have ordered some boards from a professional PCB assembling company, who does the soldering of the slightly difficult small SMD parts. I'll get the boards in the week from march 26 and after a full test, it will be available from a shop I've ...
by Frank Buss
Tue Jan 24, 2012 5:40 am
Forum: Other projects
Topic: RS232 Breakout Board
Replies: 32
Views: 19781

Re: RS232 Breakout Board

<t>Nice, and looks like you have a prototype area, too. Maybe you should add a 3.3 V voltage regulator, because the 3.3 V supply of the Raspberry Pi supplies just up to 50 mA. I've used the MCP1703 for my IO expander project, which provides up to 250 mA and has a short circuit protection. For the ca...
by Frank Buss
Sun Jan 22, 2012 10:01 am
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<t>Donwload finished, the I2C test program compiles in the VM for the Raspberry Pi scratchbox and I can start it, but it doesn't find the I2C device. Is it possible to emulate I2C inside of the scratchbox (I guess it is QEMU)? Looks more like an environment to test compilation and if it starts with ...
by Frank Buss
Sun Jan 22, 2012 12:05 am
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<r>I have converted it to Python, but I have not much experience with it, so could be not very Python idiomatic, but it looks already much nicer than the raw C version and it works on my LinkStation:<br/> <br/> <URL url="http://www.frank-buss.de/io-ex.....2c-test.py">http://www.frank-buss.de/io-ex.....
by Frank Buss
Sat Jan 21, 2012 10:22 pm
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<r>I've soldered a version 0.2 board (this is the same as the final version, but without the voltage regulator). I don't have a Raspberry Pi for testing it, but I've modded my LinkStation, this is an example how to use it with Linux:<br/> <br/> <br/> <br/> On a Raspberry Pi it should work the same: ...
by Frank Buss
Thu Jan 19, 2012 9:23 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 109992

Re: Gertboard

<r>Gert said: <br/> <br/> <br/> This is tested code which accesses the GPIO pins through direct GPIO register manipulation in C-code. Thanks to Dom for doing the difficult work of finding and testing the mapping.<br/> <br/> ...<br/> <br/> (Sorry tried post-editing to get proportional smaller font.<b...
by Frank Buss
Tue Jan 17, 2012 2:55 pm
Forum: Staffroom, classroom and projects
Topic: Raspberry Pi or Arduino?
Replies: 29
Views: 10718

Re: Raspberry Pi or Arduino?

Jane1 said:


@JamesH: And how did  you(Foundation)  manage to persuade Broadcom to provide full datasheet?



Read it again: he didn't wrote full datasheet
by Frank Buss
Tue Jan 17, 2012 9:09 am
Forum: Off topic discussion
Topic: Soldering iron recommendations
Replies: 44
Views: 17655

Re: Soldering iron recommendations

<t>I'm using an Ersa i-CON. I've used cheap soldering irons before and it makes really a difference, e.g. if you try to solder something to big ground planes. But it depends what you want to do with it. If you just solder simple boards with lots of through hole parts like the Gertboard, and not much...
by Frank Buss
Tue Jan 17, 2012 9:03 am
Forum: Staffroom, classroom and projects
Topic: Raspberry Pi or Arduino?
Replies: 29
Views: 10718

Re: Raspberry Pi or Arduino?

<t>rurwin said: <br/> <br/> There is nothing in there that an Arduino can do that a RPi can not do at least as well.<br/> In theory you are right, but I guess the standard Linux distributions for the RPi are not hard realtime, so this might be a problem for some applications. Of course, not a proble...
by Frank Buss
Tue Jan 17, 2012 8:54 am
Forum: General discussion
Topic: Easy GPIO Hardware & Software
Replies: 133
Views: 51542

Re: Easy GPIO Hardware & Software

<r>meltwater said: <br/> <br/> <br/> Updated circuits...3 may or may not require smoothing cap, guess I'll see.<br/> <br/> Thanks for the advice people, hopefully I've understood it enough.  Things like optical buffers I will suggest they are used during testing at least, they look easy enough to us...
by Frank Buss
Tue Jan 17, 2012 8:43 am
Forum: General discussion
Topic: Retro videogame systems coding?
Replies: 2
Views: 1445

Re: Retro videogame systems coding?

<t>I don't know, if it would be a good idea for kids to start with something like Z80 programming, maybe would be better to use PyGame or similar modern languages and environments. But I'm interested in doing some retro stuff on the Raspberry Pi. I have some knowledge about the C64, see e.g. my C64 ...
by Frank Buss
Tue Jan 17, 2012 7:02 am
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<t>SeanD said: <br/> <br/> It looks good, and you are right this would be useful not just for the RPi.  Sure you do not want to pop ADC onto it?  From my experience teaching kids Arduino there are two features that get used pretty quick and they are one or two channels of analog input and PWM.  Ther...
by Frank Buss
Tue Jan 17, 2012 6:02 am
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<r>Ok, I've updated the schematic and the board. Now there is an additional 3.3 V voltage regulator on board, which can be connected independently, and can be used also for other 3.3 V external components, which needs more power than the 50 mA of the Raspberry Pi 3.3 V rail:<br/> <br/> <URL url="htt...
by Frank Buss
Fri Jan 06, 2012 11:45 pm
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<t>error404 said: <br/> <br/> <br/> Nice. KISS. I like it. And there is already a driver in-tree for PCA9555, so all you need to make it work is an i2c bus driver for the BCM2835.<br/> <br/> My only suggestion is that this seems to be designed for use on a breadboard without soldering anything, so p...
by Frank Buss
Fri Jan 06, 2012 7:04 pm
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<r>hippy said: <br/> <br/> Watch out for the maximum draw of the 3V3 rail though; just 50mA.<br/> Thanks, you are right, just found the information at <URL url="http://elinux.org/RaspberryPiBoard">http://elinux.org/RaspberryPiBoard</URL> , I will add the MCP1703, which I've already used in another p...
by Frank Buss
Fri Jan 06, 2012 4:50 pm
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 18728

Re: simple 16 signal GPIO I2C board

<r>I've designed a simple board, which could be used for the Raspberry Pi to expand the number of GPIOs:<br/> <br/> <URL url="http://www.frank-buss.de/io-expander/">http://www.frank-buss.de/io-expander/</URL><br/> <br/> It should be very good for educational purposes, because each GPIO pin has a 680...

Go to advanced search