Search found 2063 matches

Go to advanced search

by Gert van Loo
Tue May 01, 2018 7:38 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

This chip has built-in freewheel diodes which take care of the turn-off voltage spikes. Otherwise it would die at the first use! There is no reason to add any more protection from your side. To switch the current-stop off you send the command once: set_short(board,channel,GB_SHORT_NONE); I have not ...
by Gert van Loo
Mon Apr 30, 2018 2:41 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

The problem is that the hardware and CPU are very, very fast. Even a very short current spike may trigger the stop-mode. Command <0x21 <id> 0x00> will prevent that. Thus 0x21 0x00 0x00 for channel 0, 0x21 0x01 0x00 for channel 1 etc. It does NOT disable the short circuit protection. That is always e...
by Gert van Loo
Mon Apr 30, 2018 11:55 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Peter, I have to work through your text in detail and think about what may be happening. I have thus far, (keep fingers crossed) not been able to blow up a board other then by a too high voltage on the motor connector. I have run test with directly shorted outputs. The ramp-up and will only prevent ...
by Gert van Loo
Tue Apr 24, 2018 7:57 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Gertbot sales in the US

featherfeet:
I have contacted a Dutch company who still have stock: https://www.kiwi-electronics.nl/
They tell me they ship world wide.
by Gert van Loo
Fri Apr 20, 2018 3:16 pm
Forum: Gertboard classic
Topic: Gertbot deceased?
Replies: 2
Views: 269

Re: Gertbot deceased?

With no heartbeat they are dead. I have not seen this before. Can you tell me how they where stored? I still have lots of the first batch here and the are still working fine. But then they are still in the original box in bag and EMC foam. I have done a re-flashing service at shipping cost for someb...
by Gert van Loo
Thu Apr 19, 2018 2:10 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Most likely your serial port is not enabled on the Pi3.
See https://www.gertbot.com/pi3.html for how to get your serial port working.
by Gert van Loo
Thu Apr 19, 2018 1:07 pm
Forum: Gertboard classic
Topic: libstdc++.so.6: version `CXXABI_1.3.9' not found (required by ./gertbot)
Replies: 4
Views: 401

Re: libstdc++.so.6: version `CXXABI_1.3.9' not found (required by ./gertbot)

First: You have opened a thread but there is already a thread, with questions and answers, specific to the get bot https://www.raspberrypi.org/forums/viewtopic.php?f=42&t=101760#p1302622. Which version are you using? One of the problems with the Jessie image is that the QT4 libraries are no longer i...
by Gert van Loo
Sat Apr 14, 2018 3:56 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

I just did the following: Downloaded the GUI 2.8 Downloaded the gb_upload program. Connected a gertbot version 2.7 Uploaded version 2.8 to the board. Started the GUI. Selected Step Gray Pwr. Kept the Frequency at 100. Set the ramp start/stop as 1 Set the ramp speed as 0.1 Set 10000 steps. Start the ...
by Gert van Loo
Sat Apr 14, 2018 10:47 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

RS have been the only one still buying from me. You should have a look at their stock. Manufacturing is done in batches of 2500. As sales have been declining, it is not economic viable for me to start a new batch. (I sold ~400 last year). I still have a few hundred in stock but I am not set-up to e....
by Gert van Loo
Sat Apr 07, 2018 8:29 pm
Forum: Nederlands
Topic: raspberry pi verbinden via uart naar arduino
Replies: 1
Views: 181

Re: raspberry pi verbinden via uart naar arduino

De UART kun je openen, lezen en schrijven als een file . (/dev/ttyAMA0).

Voor het echte verbinden moet je oppassen want de Arduino is 5V en de Pi is 3.3 Volt.
Google "connect raspberry pi to arduino serial" geeft ~1.000.000 resultaten.
by Gert van Loo
Tue Apr 03, 2018 8:24 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

It will take some time as I have some other obligations.

As to reading the end-stop switches, that is already supported.
They are just normal inputs thus a 'READ input' command will give you that information.
You can try it with the GUI by first switching to 'board' mode. On the LHS is a Read button.
by Gert van Loo
Tue Apr 03, 2018 7:55 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

If you connect a solenoid between A1 and A2 it will drive it. The same for B1/B2, C1/C2, D1/D2. But there is no on/off software for that, so you have to use DC motor mode. Either forward or backwards will activate the solenoid. But the board has eight half bridges. So it could drive 8 single ended d...
by Gert van Loo
Sun Apr 01, 2018 7:00 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

My apologies. There was a typo in the file which made that the link was wrong.
I thought that I had tested downloading each file but I must have missed that one.
It is now in place with more information how to get it running and
how to use a better font.
by Gert van Loo
Fri Mar 30, 2018 9:34 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Durian,
I don't think that is a good idea. You are likely to blow up your motor.
Use 8V as that is the minimum voltage the gertbot can run at.
Then add series resistors of 2.7 Ohm, ~3Watt.
by Gert van Loo
Fri Mar 30, 2018 4:05 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

For stepper motors version 2.8 only offer ramping extra.
But there are some other non-stepper motor features like de-bounce filters on the end switches.
by Gert van Loo
Tue Mar 13, 2018 8:48 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

There are two archives with complete source code which you can download which use the gertbot with QT: Gertbot Debug GUI and DCC example gui. The latter is the smallest. Both are written for QT4.8 and I understand the Pi now has QT5. But the code how to interface with the UART is independent from th...
by Gert van Loo
Mon Mar 12, 2018 9:54 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Why have you: - Written: uart_opened=true; ? - Commented out the uart_open() call ? The first line in the simple rover example main file is: // Open serial port to talk to Gertbot if (!open_connection(0)) return 1; Which you have not used. By the way: if you want to use c++ be careful when using the...
by Gert van Loo
Tue Jan 23, 2018 7:40 pm
Forum: Other projects
Topic: Home automation via Zigbee
Replies: 9
Views: 38439

Re: Home automation via Zigbee

I used "zigbee Deconz" in google an that led me to this:
https://www.dresden-elektronik.de/funkt ... pc/deconz/

Where they advertise "deCONZ V2_04_99 (Raspbian Linux)" and "deCONZ V2_06_11 (RaspBee Firmware)"
by Gert van Loo
Sat Jan 20, 2018 5:47 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Great to hear that.
Note that last weekend I did mange to release version 2.8 which supports ramping of the stepper motors.

If you work with motors and motion you will find that slow starting/stopping is not a luxury, it is mandatory.
I found out when I built the 'Toast-e' prototype.
by Gert van Loo
Fri Jan 12, 2018 8:58 pm
Forum: Raspbian
Topic: Stretch missing QT4 runtime libraries
Replies: 4
Views: 552

Re: Stretch missing QT4 runtime libraries

so I often do more filtering with grep. As per my remark in the post: "apt-get list -all | grep -i qt" :-) if you want to know exactly all missing libraries for a binary use the command "ldd program". I know and used that one. In this case it only worked partially. My program was running but all th...
by Gert van Loo
Fri Jan 12, 2018 8:06 pm
Forum: Raspbian
Topic: Stretch missing QT4 runtime libraries
Replies: 4
Views: 552

Re: Stretch missing QT4 runtime libraries

Thank you for the link. I asked at stack exchange but did not get a reply. I will update my web page to tell user to use "sudo apt-get install libqtgui4" Is there a command to list all possible packages? something like: "apt-get list -all" Then I could have found that package myself using something ...
by Gert van Loo
Fri Jan 12, 2018 1:22 pm
Forum: Raspbian
Topic: Stretch missing QT4 runtime libraries
Replies: 4
Views: 552

Stretch missing QT4 runtime libraries

I received a complaint that my SW is no longer working: error while loading shared libraries: libQtGui.so.4: cannot open shared object file: No such file or directory I compared /usr/lib in stretch and and jessie and yes! in stretch the qt4 libs have disappeared. I had not noticed that, because I de...
by Gert van Loo
Fri Jan 12, 2018 11:26 am
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Downloading the QT4 libraries. You only need to download the QT4 runtime libraries if you get an error message saying " libQtGui.so.4: cannot open shared object file: No such file or directory " At the moment this is the case if you use a stretch image. (uname -r gives as output "4.9.41-v7+") In th...
by Gert van Loo
Thu Jan 11, 2018 11:36 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

First note that I have updated the gertbot webpages several times over the last two days. There are tested instruction on there: https://www.gertbot.com/pi3.html domoticom had even more problems (Qt4 libraries where missing) but I manged to help him out and for him it now all works: https://www.rasp...
by Gert van Loo
Thu Jan 11, 2018 10:57 pm
Forum: Gertboard classic
Topic: Gertbot
Replies: 118
Views: 27353

Re: Gertbot

Yes 2.6 is the latest but I have been asked for 2.8 which I will try to get out this weekend. I have not done so as I have not had time to update the C or python drivers. Revision 2.7 has support for servo motors. It does not use the power bridge at all but outputs a 3.3Volt variable pulse width to ...

Go to advanced search