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by HermannSW
Sat Dec 14, 2019 5:14 pm
Forum: General discussion
Topic: screen capture program
Replies: 4
Views: 97

Re: screen capture program

I use raspi2png:
https://github.com/AndrewFromMelbourne/raspi2png

It captures console as well as X11, and it captured raspivid HDMI preview windows as well (what I need).
https://www.raspberrypi.org/forums/view ... 4#p1573596
Image
by HermannSW
Sat Dec 14, 2019 5:09 pm
Forum: General discussion
Topic: Raspberry pi Camera Module V2 not displaying preview
Replies: 3
Views: 69

Re: Raspberry pi Camera Module V2 not displaying preview

alphanumeric wrote:
Sat Dec 14, 2019 9:57 am
Camera interface enabled / turned on in Raspberry Pi Configuration?
What is output of "vcgencmd get_camera"?
If both is 1, does "raspivid -t 0" show preview window?
by HermannSW
Sat Dec 14, 2019 4:50 pm
Forum: Advanced users
Topic: Show current IP address on desktop or statusbar
Replies: 5
Views: 2231

Re: Show current IP address on desktop or statusbar

Nice, but where I am currently I would need to figure out how to automate login into Wifi first (done via a webpage) in order to let Pi send email to internet. That solution does not work in case there is no internet access from local network. See "Show Raspberry Pi IP-address on PWR led on boot" th...
by HermannSW
Sat Dec 14, 2019 4:41 pm
Forum: Raspbian
Topic: Show Raspberry Pi IP-address on PWR led on boot
Replies: 1
Views: 80

Show Raspberry Pi IP-address on PWR led on boot

I just read on sending IP-address per email out: https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=154580&p=1580663#p1578898 Where I am now you have to login to Wifi via a web page. So I could try to figure out how to automate the Wifi login and send an email. I thought what to do in case ther...
by HermannSW
Sat Dec 14, 2019 2:35 pm
Forum: Raspbian
Topic: OpenSCAD
Replies: 28
Views: 3535

Re: OpenSCAD

Ihave to partially correct my statements. The Pi was a Pi3B (a02082), and not Pi2B. What did cost 1:42min was clicking on 2nd from left "Render" button. I have no idea what that does exactly, because when I start the appimage, and then double click the last file I had worked with (the stepper PT cam...
by HermannSW
Sat Dec 14, 2019 1:49 pm
Forum: Automation, sensing and robotics
Topic: installing OpenCV issues
Replies: 3
Views: 86

Re: installing OpenCV issues

I did build OpenCV according these instructions: https://www.pyimagesearch.com/2019/09/16/install-opencv-4-on-raspberry-pi-4-and-raspbian-buster/ People commented that the instructions work for Pi3B as well. Clean installation, while I need the C interface only, Python interface with workspaces got ...
by HermannSW
Sat Dec 14, 2019 1:35 pm
Forum: Camera board
Topic: Camera Ribbon Cable - twisting problems
Replies: 4
Views: 160

Re: Camera Ribbon Cable - twisting problems

Ooops, I only mentioned the advantages, and not the main disadvantage of stepper PT camera system: servos have encoders built in and move to the position you tell, while steppers don't know position and might loose steps (no problem for me since my steppers will be controlled based on video feedback...
by HermannSW
Sat Dec 14, 2019 1:15 pm
Forum: Camera board
Topic: Camera Ribbon Cable - twisting problems
Replies: 4
Views: 160

Re: Camera Ribbon Cable - twisting problems

The only supported camera cable is the 15cm one -- but I use 1m and 2m ribbon cables routinely without issues. For my stepper PT camera system I use 1m ribbon cable: https://forum.arduino.cc/index.php?topic=647703.msg4370582#msg4370582 https://stamm-wilbrandt.de/en/forum/pi.uln2003.anim.gif Why step...
by HermannSW
Thu Dec 12, 2019 9:22 pm
Forum: Raspbian
Topic: OpenSCAD
Replies: 28
Views: 3535

Re: OpenSCAD

Direct AppImage link: https://files.openscad.org/snapshots/OpenSCAD-2019.01.13-armhf.AppImage Thanks, I downloaded the appimage and had to google what to do with it. Only "chmod a+x OpenSCAD-2019.01.13-armhf.AppImage" and then "./OpenSCAD-2019.01.13-armhf.AppImage" and it ran. I will need to instal...
by HermannSW
Tue Dec 10, 2019 10:13 pm
Forum: C/C++
Topic: Best framework for maximum video performance?
Replies: 5
Views: 301

Re: Best framework for maximum video performance?

I think MMAL is an efficient framework, but I cannot help with that. There is a (C) framework I did build myself, and allows video processsing on they fly while capturing. Typically bash pipeline starts with raspividyuv, then processing (modifying or not modifying) is done in C plugins, and finally ...
by HermannSW
Tue Dec 10, 2019 9:57 pm
Forum: Camera board
Topic: Can't get IR-cut camera to switch to IR mode
Replies: 2
Views: 114

Re: Can't get IR-cut camera to switch to IR mode

This is an IR-cut camera: https://www.aliexpress.com/item/32971334984.html In case you bought the camera with the two IR leds, don't power them by the camera. The 3V3 power rail of the Raspberry is not designed for that. Just power the IR-leds with 3V3 from elsewhere. You can easily verify that IR l...
by HermannSW
Mon Dec 09, 2019 12:54 am
Forum: Camera board
Topic: Rpi camera "no data received from sensor...check sunny chip"
Replies: 3
Views: 191

Re: Rpi camera "no data received from sensor...check sunny chip"

Which camera version do you have?
What is the output of "vcgencmd get_camera" after reboot?
by HermannSW
Mon Dec 09, 2019 12:36 am
Forum: C/C++
Topic: How to drive max7219 8digit 7segment tube via pigpio spi?
Replies: 5
Views: 198

Re: How to drive max7219 8digit 7segment tube via pigpio spi?

Thanks for the feedback -- but I switched to external power supply for the max7219 too late. Unfortunately that was my (only) Pi4B. Good news, reboot works, ssh works, HDMI works, camera works. Bad news, I seem to have completely lost all GPIO. pi@raspberrypi4B:~ $ gpio readall Oops - unable to dete...
by HermannSW
Sun Dec 08, 2019 3:51 pm
Forum: C/C++
Topic: How to drive max7219 8digit 7segment tube via pigpio spi?
Replies: 5
Views: 198

Re: How to drive max7219 8digit 7segment tube via pigpio spi?

I missed to set CS to low. This diff shows a partially working solution (spi1.c attached as well): $ diff -C 1 spi1.c.old spi1.c *** spi1.c.old 2019-12-08 16:42:19.510478349 +0100 --- spi1.c 2019-12-08 16:44:09.716156219 +0100 *************** *** 7,8 **** --- 7,9 ---- #include <stdlib.h> + #include ...
by HermannSW
Sun Dec 08, 2019 3:33 pm
Forum: C/C++
Topic: How to drive max7219 8digit 7segment tube via pigpio spi?
Replies: 5
Views: 198

How to drive max7219 8digit 7segment tube via pigpio spi?

Starting with an Arduino library I removed the library and reduced to minimal sketch that displays all 8 segments/dot on the 8 positions: #define DIN 5 #define CS 4 #define CLK 3 #define DECODEMODE_ADDR 9 #define BRIGHTNESS_ADDR 10 #define SCANLIMIT_ADDR 11 #define SHUTDOWN_ADDR 12 #define DISPLAYTE...
by HermannSW
Sun Dec 08, 2019 12:39 am
Forum: General discussion
Topic: [Tutorial] How to plug two camera modules on a Raspberry Pi
Replies: 36
Views: 6051

Re: [Tutorial] How to plug two camera modules on a Raspberry Pi

BTW: Did you see StereoPi Board? Check here: https://pallavaggarwal.in/6-raspberry-pi-compute-module-development-board/#7_StereoPi_89 Yes, with StereoPi you will have to deal with Compute module and not normal PIs, and if you already have a Pi, stereo hat is cheaper: https://www.raspberrypi.org/for...
by HermannSW
Sun Dec 08, 2019 12:00 am
Forum: General discussion
Topic: How use raspberry pi using plasma TV
Replies: 5
Views: 805

Re: How use raspberry pi using plasma TV

For few weeks now the 12yo Panasonic 42" Plasma TV has small stripe of color showing up on left side. Since our son bought a new TV for himself, we did put his (3yo) 40" TV into living room. Now the 42" Panasonic TV hangs directly in neighborhood of workbench with the PIs. The PIs can now choose bet...
by HermannSW
Fri Dec 06, 2019 5:59 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 102
Views: 18897

Re: Hardware camera sync pulses

Thanks, I will try with the Pi4B. In the meantime I switched to Pi2B and used that. The sync pulses triggered an Arduino Uno to display "millis()" for few milliseconds on 8-digit 7-segment tube display after frame start (it acts on frame end, then waits for frame start). That allowed to take 90fps g...
by HermannSW
Fri Dec 06, 2019 3:30 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 102
Views: 18897

Re: Hardware camera sync pulses

Start with https://github.com/raspberrypi/firmware/blob/master/extra/dt-blob.dts which is the source for the blob that is built in to the firmware. There is a section for Pi4B, but since CAMERA_0_LED is not existent on Pi4B it states: pin_define@CAMERA_0_LED { type = "absent"; }; Does Pi4B allow fo...
by HermannSW
Fri Dec 06, 2019 7:41 am
Forum: Compute Module
Topic: Smart Camera (EagleEYE) based on CM3+
Replies: 5
Views: 216

Re: Smart Camera (EagleEYE) based on CM3+

- Why did not you go with IMX219 for sensor ? As Gavinmc42 said, main argument is that ov5647 is clonable because of missing crypto chip. Sice Amomthep doesn't use a camera board but raw camera chip, imx219 is no option. Another is price point, you can buy a v2 camera module for 25$, but a v1 camer...
by HermannSW
Thu Dec 05, 2019 2:17 pm
Forum: Camera board
Topic: Creating a RPI-assisted microscope
Replies: 75
Views: 13806

Re: Creating a RPI-assisted microscope

You need to use a different wavelenth. CDs are opaque in IR, DVDs in UV. Why? I have split a DVD into half, see posting before in this thread. With "-awb greyworld" I will get a normal raspistill image with NoIR v1 camera. And I light the scene with a normal 700lm Ikea lamp (after the 1000lm I had ...
by HermannSW
Thu Dec 05, 2019 12:37 pm
Forum: Camera board
Topic: Creating a RPI-assisted microscope
Replies: 75
Views: 13806

Re: Creating a RPI-assisted microscope

Previous posting total tube length was 16cm and worked. I tried with 81cm aluminum tube and saw nothing. Then with 26cm aluminum tube, was only able to see something from aluminum alloy microscope ground plate, but nothing else, not even micrometer slide. Yesterday I received the new micrometer cali...
by HermannSW
Wed Dec 04, 2019 7:40 pm
Forum: General discussion
Topic: Custom Raspberry Pi 3b+ Prototype
Replies: 4
Views: 242

Re: Custom Raspberry Pi 3b+ Prototype

dedetuga wrote:
Wed Dec 04, 2019 4:31 am
How can I edit the raspberry pi 3b+ pieces orientation, replace parts and build my design on the same PCB?
They might help with that:
https://www.arducam.com/shrink-your-ras ... on-module/
by HermannSW
Wed Dec 04, 2019 8:25 am
Forum: Camera board
Topic: Raw sensor access / CSI-2 receiver peripheral
Replies: 532
Views: 170048

Re: Raw sensor access / CSI-2 receiver peripheral

I wanted to watch the updating phase of a max7219 8-digit tube 7-segment display. This was the first time I was able to use 640x64 tool to record 665fps video with v1 camera not for speed demonstration purpose. The animations were extracted from two videos, from a phase without frame skips (2% frame...
by HermannSW
Wed Dec 04, 2019 7:49 am
Forum: Camera board
Topic: HOWTO: stream raspberry pi camera video output to another computer using raspivid, netcat, and vlc
Replies: 2
Views: 155

Re: HOWTO: stream raspberry pi camera video output to another computer using raspivid, netcat, and vlc

Lowest latency I have seen among several solutions is using uv4l raspicam driver: http://www.linux-projects.org/uv4l/installation/ As long as you use it for private projects, usage is free. Some people don't want to use that because of licensing terms, or because it is not open source. But they use ...

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