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by HermannSW
Thu Oct 17, 2019 8:37 pm
Forum: Automation, sensing and robotics
Topic: pigpio capabilities?
Replies: 9
Views: 354

Re: pigpio capabilities?

Just to be clear, are you saying the servo jitter mentioned in your earlier post was being caused by a ground problem? Yes. My colleague explained to me that the previously slightly longer (thin) cable connection from Pi GND to constant current GND than the servo GND connections is likely to make t...
by HermannSW
Thu Oct 17, 2019 6:06 pm
Forum: Automation, sensing and robotics
Topic: pigpio capabilities?
Replies: 9
Views: 354

Re: pigpio capabilities?

I discussed your proposal with a colleague. The servos themselves generate a lot of noise on the power supply rail, He agreed on that. additional decoupling capacitors across the power wires right beside the servos should fix the problem as long as your power supply is not drooping under load. He di...
by HermannSW
Thu Oct 17, 2019 4:29 pm
Forum: Camera board
Topic: Very magenta picture from NOiR camera when only light source is infrared
Replies: 4
Views: 109

Re: Very magenta picture from NOiR camera when only light source is infrared

6by9 wrote:
Thu Oct 17, 2019 12:48 pm
Sticky at the top of the forum - New AWB algorithm - NoIR camera support
I did point out exactly that two days ago, but my response got deleted ...
by HermannSW
Wed Oct 16, 2019 10:37 pm
Forum: Camera board
Topic: Camera controlled automatic PT approach for a landing capturing
Replies: 6
Views: 536

Re: Camera controlled automatic PT approach for a landing capturing

Initial build of PT camera system with 70mm done. First I missed matching gearwheel connector for ground plate. As workaround I did simply superglue the existing connector to desk. Two drops of superglue to Raspberry camera module connector. And some superglue on top plastic line of bracket, connect...
by HermannSW
Wed Oct 16, 2019 7:51 pm
Forum: Camera board
Topic: Recommended IR filters for Pi-NoIR
Replies: 20
Views: 18919

Re: Recommended IR filters for Pi-NoIR

I just got an Arducam Day-Night Vision for Raspberry Pi Camera, Automatic IR-Cut Switching All-Day Image All-Model Support, IR LED for Low Light and Night Vision, M12 Lens Interchangeable, OV5647 5MP 1080P from Amazon. It worked well out of the box and I have it running with MotionEyeOS. It does ev...
by HermannSW
Wed Oct 16, 2019 7:11 pm
Forum: Camera board
Topic: On Hands and Knees Begging for a proper-Good Camera
Replies: 34
Views: 795

Re: On Hands and Knees Begging for a proper-Good Camera

Here is a Starvis demo video. (Imx290). https://youtu.be/6gwt7mFOxBs Wow, now I understand why you want WDR/low light support -- a picture says more than 1000 words, from 2:22min of that video: https://stamm-wilbrandt.de/en/forum/outdoor.imx290.png I cannot answer your questions directed to RPF, an...
by HermannSW
Wed Oct 16, 2019 1:24 pm
Forum: Camera board
Topic: On Hands and Knees Begging for a proper-Good Camera
Replies: 34
Views: 795

Re: On Hands and Knees Begging for a proper-Good Camera

> Please read the page, you will see that it implements a userland driver. This does not allow access to the full Raspivid controls. > The Arducam driver is raspiraw based because any kernel driver would run into GPL problems: https://github.com/ArduCAM/MIPI_Camera > You can only use 1080p 30fps. Or...
by HermannSW
Tue Oct 15, 2019 4:21 pm
Forum: Automation, sensing and robotics
Topic: pigpio capabilities?
Replies: 9
Views: 354

Re: pigpio capabilities?

In a twitter discussion I provided connection diagram, which might make answering the questions easier:
https://twitter.com/HermannSW/status/11 ... 8222300160
GraphvizFiddle share link
Image
by HermannSW
Tue Oct 15, 2019 12:33 am
Forum: HATs and other add-ons
Topic: Raspberry pi zero display
Replies: 6
Views: 569

Re: Raspberry pi zero display

kflmiami420 wrote:
Mon Oct 14, 2019 12:09 am
Who is going to write the drivers for those displays that were offered in the links in other users responses ?
The display driver is SSD1322.
Search google for "SSD1322 arduino" or "SSD1322 raspberry" and you will get drivers you can use, or use as a start for your own.
by HermannSW
Tue Oct 15, 2019 12:10 am
Forum: C/C++
Topic: Running C/C++ on Raspberry Pi
Replies: 32
Views: 1136

Re: Running C/C++ on Raspberry Pi

My IDE for C/C++ is
  • vi (editor, use it since 1990)
  • gcc/g++ (compiler)
  • gdb (debugger)
  • make
  • (git)
I don't need more than that.
by HermannSW
Tue Oct 15, 2019 12:02 am
Forum: Automation, sensing and robotics
Topic: pigpio capabilities?
Replies: 9
Views: 354

Re: pigpio capabilities?

Forgot to post that this worked great. Even under load? Did you power the two PT servos from two Raspberry 5V pins? I read that you should not drive more than two SG90 from a Pi. Without load two SG90s powered directly by Pi are no problem: https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=25...
by HermannSW
Mon Oct 14, 2019 11:08 pm
Forum: Automation, sensing and robotics
Topic: Half baked solution to the stereo camera problem on the Pi's.
Replies: 4
Views: 447

Re: Half baked solution to the stereo camera problem on the Pi's.

I am aware of that, and it has a development board which can be used to load the OS onto and comes with two cables, etc, etc and a price tag of ca. $100 USD. The StereoPi is based on the compute module 3 lite, as far as I know from their docs I cannot tell on the pricing of synchronized stereo hat ...
by HermannSW
Mon Oct 14, 2019 8:54 am
Forum: Camera board
Topic: Arducam cameras fitting Raspberry CSI-2 interface
Replies: 7
Views: 985

Re: Arducam cameras fitting Raspberry CSI-2 interface

After my bad soldering experience I received an email from Lee: BTW I told our engineer to design a stereo OV9281 camera adapter board, you don't worry about soldering any more . Do you have any requirements about the base line between these two cameras? I did measure and distance between my pupil c...
by HermannSW
Mon Oct 14, 2019 8:11 am
Forum: Camera board
Topic: Purple snowstorm - hardware intereference or software?
Replies: 1
Views: 79

Re: Purple snowstorm - hardware intereference or software?

See "Camera board" forum pinned thread "New AWB algorithm - NoIR camera support" -- pinned threads are there for a reason ...
by HermannSW
Sun Oct 13, 2019 12:06 pm
Forum: Automation, sensing and robotics
Topic: Hardware PWM pins on pi zero W?
Replies: 6
Views: 386

Re: Hardware PWM pins on pi zero W?

Releasing the magic smoke is not the learning experience I am after. I once experienced 2cm high flames out of a L293D motor controller ;-) https://forum.arduino.cc/index.php?topic=353611.msg2437692#msg2437692 https://stamm-wilbrandt.de/en/forum/v3/0.burned.jpg Do I actually need this benefit over ...
by HermannSW
Sun Oct 13, 2019 8:08 am
Forum: C/C++
Topic: Setting up PWM channel 2 not working on GPIO 13 or 19 pins
Replies: 1
Views: 181

Re: Setting up PWM channel 2 not working on GPIO 13 or 19 pins

You might want to try pigpio library pigs command to see whether GPIO13 works (with logic analyzer): http://abyz.me.uk/rpi/pigpio/pigs.html I use it without any issue to generate any PWM I want on GPIO13: https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter/blob/master/tools/pwm...
by HermannSW
Sun Oct 13, 2019 7:14 am
Forum: Automation, sensing and robotics
Topic: Any easy way to sync two RPis?
Replies: 9
Views: 2154

Re: Any easy way to sync two RPis?

I would like to start testing the model on my own stereo images, but I don't want to pay the $200-$300 price tag of a stereo camera. I have been looking at the StereoPi option as well, but I already have about a half dozen Pi's and cameras, so why buy more! I do have samples of Arducam Stereo hat f...
by HermannSW
Sun Oct 13, 2019 6:22 am
Forum: Automation, sensing and robotics
Topic: Hardware PWM pins on pi zero W?
Replies: 6
Views: 386

Re: Hardware PWM pins on pi zero W?

The mx1508 module seems to have less control pins than the TB6612fng module I use (both modules available for <1$ on aliexpress.com with free shipping):
Image
by HermannSW
Sat Oct 12, 2019 9:07 pm
Forum: Automation, sensing and robotics
Topic: flag_semaphore att rest R A S P B E R R Y ready
Replies: 0
Views: 252

flag_semaphore att rest R A S P B E R R Y ready

After connecting two SG90 servos to the Pi (GND/5V/GPIO[12]7 connected to SG90 brown/red/orange), and having figured out that pigpio pigs command "pigs s 17 X" with X=500/1500/2500 moves servo connected to GPIO17 to 0°/90°/180° position, I wanted to have some little demo. Bash script "flag_semaphore...
by HermannSW
Sat Oct 12, 2019 2:18 pm
Forum: Camera board
Topic: Camera controlled automatic PT approach for a landing capturing
Replies: 6
Views: 536

Re: Camera controlled automatic PT approach for a landing capturing

I am not in Holzgerlingen right now, but flightradar24 allowed me to watch some departures from Stuttgart airport. Four airplanes heading to southeast Europe or Italy took the lower trajectory, but the Airbus A319 to Lisbon took the upper trajectory: https://stamm-wilbrandt.de/en/forum/flight/STR-LI...
by HermannSW
Sat Oct 12, 2019 12:09 am
Forum: HATs and other add-ons
Topic: WoodenBoardPi
Replies: 3
Views: 339

Re: WoodenBoardPi

Thanks for that information, I did not know about Fresnel zone: https://en.wikipedia.org/wiki/Fresnel_zone All I did in the past was experimentally determine maximal length where Wifi connection works. In basement of IBM Böblingen lab I found that even 170m inhouse in line of sight with quality 30/7...
by HermannSW
Fri Oct 11, 2019 4:58 pm
Forum: Camera board
Topic: Camera controlled automatic PT approach for a landing capturing
Replies: 6
Views: 536

Re: Camera controlled automatic PT approach for a landing capturing

I just measured the weight of v1 camera with 70mm M12 lens mounted as 19.1g. Not sure whether PT bracket can carry that and function as well: https://stamm-wilbrandt.de/en/forum/70mm.lens.weight.png I don't know the shortest distance between secondary living place slanted roof window and a passing a...
by HermannSW
Fri Oct 11, 2019 4:26 pm
Forum: HATs and other add-ons
Topic: WoodenBoardPi
Replies: 3
Views: 339

Re: WoodenBoardPi

I switched to the other side of the house, into (also 1st floor) bathroom, this time with music stand. WoodenBoardPi sits easily on plastic music rest, the Wireless keyboard has a safe place there as well. https://stamm-wilbrandt.de/en/forum/WoodenBoardPi/IMG_111019_170721.jpg The target I had was t...
by HermannSW
Fri Oct 11, 2019 10:20 am
Forum: Camera board
Topic: Maximum capture speed
Replies: 10
Views: 2159

Re: Maximum capture speed

Thanks for uncovering my factor 3 error.
Now all makes sense and explains why 25fps are possible including CSI2 overhead:

Code: Select all

$ echo "scale=2; 2*(1024^3)/(3280*2464*10)" | bc -ql
26.57
$
by HermannSW
Fri Oct 11, 2019 9:25 am
Forum: Camera board
Topic: Maximum capture speed
Replies: 10
Views: 2159

Re: Maximum capture speed

Csi2 supports up to 1Gbit/s per lane, and the Pi exposes two lanes. The cameras generally produce bayer data at 10bits per pixel. I make that 200MPix/s, ... It is 231.22Mbits per frame: $ echo "scale=2; 3280*2464*3*10/(1024^2)" | bc -ql 231.22 $ ... or 25fps at 8MPix. I must be doing something wron...

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