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by HermannSW
Sat Feb 16, 2019 12:09 am
Forum: Camera board
Topic: Pi Camera Troubleshooting
Replies: 3
Views: 1246

Re: Pi Camera Troubleshooting

I only had this "snap needed" problem once, when RC airplane with Pi Zero and v1 camera on board crashed hard on the ground. The resulting force was big enough to disconnect the sunny connector ;-) https://www.raspberrypi.org/forums/viewtopic.php?t=190407#p1197157 https://stamm-wilbrandt.de/en/forum...
by HermannSW
Thu Feb 14, 2019 12:10 am
Forum: Networking and servers
Topic: Using Raspberry Pi as man in the middle
Replies: 3
Views: 236

Re: Using Raspberry Pi as man in the middle

Why not use the one ethernet port for input as well as output? Alternatively you can use Wifi as 2nd port. I assume the client/server should not know on the Pi in between? If so, capturing the traffic can be done with Ettercap tool on Raspberry. I used it to reverse engineer the Wifi traffic between...
by HermannSW
Tue Feb 12, 2019 7:30 am
Forum: Camera board
Topic: 3Dprinted "M12 mount for Raspberry Pi V2 Camera"
Replies: 0
Views: 90

3Dprinted "M12 mount for Raspberry Pi V2 Camera"

Until now I used a small metal M12 mounts from aliexpress (2$/pc with free shipping) for one of my v1 and one v2 camera as described in this posting: https://www.raspberrypi.org/forums/viewtopic.php?t=45887&start=50#p1279957 A colleague told me about his 3D printer at home, and on Thingiverse site h...
by HermannSW
Mon Feb 11, 2019 10:07 pm
Forum: Camera board
Topic: Small and simple horizontal v2 camera with M12 mount holder built from Lego bricks
Replies: 0
Views: 64

Small and simple horizontal v2 camera with M12 mount holder built from Lego bricks

I did need a small and simple horizontal v2 camera with M12 mount holder. This is it, built from 6 Lego bricks, stable camera position, place for camera cable, created with https://www.mecabricks.com/en/workshop : https://stamm-wilbrandt.de/en/forum/camera.holder.png This is the real thing with came...
by HermannSW
Mon Feb 11, 2019 4:44 pm
Forum: Camera board
Topic: Is 5000lm+5000lm leds = 10000lm with this 50W driver?
Replies: 14
Views: 1169

Re: Is 5000lm+5000lm leds = 10000lm with this 50W driver?

How are you focusing the light? emitting 5000lm is not the same as shining 5000lm on a surface. Thanks for that comment, it resolved my issues in this new thread: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=232971&p=1428384#p1428384 A symmetrical design with aluminum foil on cardboard i...
by HermannSW
Mon Feb 11, 2019 1:11 pm
Forum: Camera board
Topic: [SOLVED] Question on [1-3]×5000lm "-set" exposure times
Replies: 1
Views: 184

Re: [SOLVED] Question on [1-3]×5000lm "-set" exposure times

The effects of the three LEDs to the photographed scene were not similar enough. I found instruction in the thread I pointed to on top of previous posting: How are you focusing the light? emitting 5000lm is not the same as shining 5000lm on a surface. Yesterday I started to arrage the three 5000lm l...
by HermannSW
Sat Feb 09, 2019 6:50 am
Forum: Camera board
Topic: Rpi cam v2 not detected with pi 1b+
Replies: 2
Views: 67

Re: Rpi cam v2 not detected with pi 1b+

The camera is not detected, which in case the camera is good can only be caused by cabling.
You can connect cable to Pi/module in two ways resulting in 4 possibilities, and only one works.
Do you use the official 15cm cable? If not try that cable.
Do you have a second cable to try?
by HermannSW
Wed Feb 06, 2019 10:30 am
Forum: Camera board
Topic: Reverse Engineered camera module
Replies: 2
Views: 223

Re: Reverse Engineered camera module

Interesting, but the imx219 image processor is from Sony, RPF only added the board with crypto chip that helped until now against cheap v2 camera board clones. The imx219 was used in millions of cell phones years ago, usage in Raspberry v2 camera is small compared to those numbers. I recently posted...
by HermannSW
Tue Feb 05, 2019 7:39 pm
Forum: Camera board
Topic: [SOLVED] Question on [1-3]×5000lm "-set" exposure times
Replies: 1
Views: 184

[SOLVED] Question on [1-3]×5000lm "-set" exposure times

This is a followup of thread "Is 5000lm+5000lm leds = 10000lm with this 50W driver?" https://www.raspberrypi.org/forums/viewtopic.php?p=1322360 I had ordered two 50W led drivers (identical to the 48V DC one I have) and received long ago. Today I did add poowr switches to the new two led drivers and ...
by HermannSW
Tue Feb 05, 2019 8:16 am
Forum: HATs and other add-ons
Topic: Official Raspberry Pi power supply -- adding power switch
Replies: 8
Views: 720

Re: Official Raspberry Pi power supply -- adding power switch

I think it is due to a small A.C. current flowing through the switch due to capacitance between the open switch contacts. This current is enough to slowly charge the high voltage DC capacitor in the PSU until it reaches a level where the PSU thinks the AC has been turned on and it tries to supply 5...
by HermannSW
Mon Feb 04, 2019 5:53 pm
Forum: HATs and other add-ons
Topic: Official Raspberry Pi power supply -- adding power switch
Replies: 8
Views: 720

Re: Official Raspberry Pi power supply -- adding power switch

I saw a mysterious short flash of Pi 3B+ PWR led every 23s, although the mains adapter is powered OFF! I reduced the setup to the absolute minimum. multi mains adapter powered on single mains adapter powered off in that adapter, official Raspberry power supply connected to Pi 3B+ HDMI cable connecte...
by HermannSW
Mon Feb 04, 2019 7:58 am
Forum: Camera board
Topic: Direct sunlight versus camera board
Replies: 6
Views: 236

Re: Direct sunlight versus camera board

OK, it makes no sense to test with 5000lm light. I read that "whatever can damage your eyes can damage a rollling shutter camera directed into sunlight as well". Global shutter cameras with reasonable shutter times are not affected, but since smartphone/Raspberry cameras are rolling shutter cameras,...
by HermannSW
Mon Feb 04, 2019 12:01 am
Forum: Camera board
Topic: Direct sunlight versus camera board
Replies: 6
Views: 236

Re: Direct sunlight versus camera board

What happens if you use a lens to focus the sun on a piece of paper? I would expect the same thing to happen to a sensor element with the sun's image focused on it. https://www.raspberrypi.org/documentation/hardware/camera/README.md Sensor image area is 3.76 × 2.74 mm / 3.68 x 2.76 mm for v1 / v2 c...
by HermannSW
Sun Feb 03, 2019 11:42 pm
Forum: General discussion
Topic: Stream multiple webcames on raspberry pi 3 B+
Replies: 4
Views: 189

Re: Stream multiple webcames on raspberry pi 3 B+

I forgot to add link to "Pi Zero works with 3 USB cameras and ethernet" thread:
https://www.raspberrypi.org/forums/view ... p?t=161121
by HermannSW
Sun Feb 03, 2019 2:58 pm
Forum: Camera board
Topic: Direct sunlight versus camera board
Replies: 6
Views: 236

Re: Direct sunlight versus camera board

I don't know why the sensor should break. I once did record directly into bright lamp without issues. Because of 600fps framerate the shutter time was not high though: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=109137&start=300#p1243594 http://stamm-wilbrandt.de/en/forum/bulb.600fps.1ps...
by HermannSW
Sun Feb 03, 2019 2:46 pm
Forum: General discussion
Topic: Stream multiple webcames on raspberry pi 3 B+
Replies: 4
Views: 189

Re: Stream multiple webcames on raspberry pi 3 B+

You can have at most one Raspberry camera.
If all/the others are USB cameras, then yes.
Besides streaming and recording, you can even display as well if you like, eg. with gstreamer:
http://wiki.oz9aec.net/index.php/Gstrea ... from_Pluto
by HermannSW
Sat Feb 02, 2019 1:54 am
Forum: General discussion
Topic: Solution for bad HDMI
Replies: 4
Views: 269

Re: Solution for bad HDMI

If analog video will break in addition to HDMI (or now), you can still use UV4L to view HDMI output in a browser:
https://www.raspberrypi.org/forums/view ... 5#p1412515
by HermannSW
Fri Feb 01, 2019 8:51 pm
Forum: Camera board
Topic: Crowdfunding started for StereoPi
Replies: 0
Views: 130

Crowdfunding started for StereoPi

Based om CM3 and two v2 cameras, there is a thread on this in "Automation, sensing and robotics" forum. I cross post for those not looking into that forum but being interested in Pi 3D vision. https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=216940 On Crowdsupply: https://www.crowdsupply.com/...
by HermannSW
Fri Feb 01, 2019 7:11 pm
Forum: Camera board
Topic: Camera V2.1 not (or no longer) working on Pi Zero W
Replies: 4
Views: 267

Re: Camera V2.1 not (or no longer) working on Pi Zero W

Doub wrote:
Fri Feb 01, 2019 4:01 pm
But the cameras v1 are still working. Wouldn't a broken connector affect all cameras equally?
Yes.

What is the output of "vcgencmd get_camera" with v2 camera connected?
by HermannSW
Thu Jan 31, 2019 11:52 pm
Forum: Raspbian
Topic: IP address of my Pi in .../16 subnet?
Replies: 12
Views: 431

Re: IP address of my Pi in .../16 subnet?

DougieLawson wrote:
Thu Jan 31, 2019 9:13 pm
BTW, I'm an ex-IBM'er.
I know ;-)
https://www.raspberrypi.org/forums/view ... 8#p1253104
by HermannSW
Thu Jan 31, 2019 9:07 pm
Forum: Raspbian
Topic: IP address of my Pi in .../16 subnet?
Replies: 12
Views: 431

Re: IP address of my Pi in .../16 subnet?

If configured properly you will not able to access the Pi from your notebook because WiFi Client Isolation will be enabled, effectively disabling access to all other wifi clients. That is a good point, so my Pi scanning attempts can only fail ! Wire your RPi to your laptop and use internet connecti...
by HermannSW
Wed Jan 30, 2019 9:16 pm
Forum: Raspbian
Topic: IP address of my Pi in .../16 subnet?
Replies: 12
Views: 431

IP address of my Pi in .../16 subnet?

I am on German high speed train ICE back home. On forward run with ICE as well I made my Pi and laptop connect to android phone AP. Then I added (free) WIFIonICE entry to PI's /etc/wpa_supplicant/wpa_supplicant.conf. So on train now I knew that Pi as well as laptop connect to free train Wifi. I used...
by HermannSW
Wed Jan 30, 2019 7:17 pm
Forum: Camera board
Topic: Minimum Object Distance (M.O.D.) of the Arducam v2.1 with Raspberry V2 cameras and suggestions on lenses
Replies: 4
Views: 206

Re: Minimum Object Distance (M.O.D.) of the Arducam v2.1 with Raspberry V2 cameras and suggestions on lenses

Taking the standard v2 camera and focusing to an object 6 cm away, you get only about 1.7cm of depth which doesn't look blurry. It depends on your use case. A very interesting comment. When recording Pi Zero with the resolution I showed, it is impossible to geht both, PCB and top of soc, sharp at s...
by HermannSW
Tue Jan 29, 2019 11:49 pm
Forum: Camera board
Topic: Minimum Object Distance (M.O.D.) of the Arducam v2.1 with Raspberry V2 cameras and suggestions on lenses
Replies: 4
Views: 206

Re: Minimum Object Distance (M.O.D.) of the Arducam v2.1 with Raspberry V2 cameras and suggestions on lenses

I had to lookup, M.O.D seems to be the distance between object and lens: https://www.vision-doctor.com/images/stories/optik/grundlagen/Use_of_extension_rings.png I don't have an Arducam kit, but I can see M12 mount and lens. You can use M12 extension rings and/or aluminum tubes to get M.O.D down to ...
by HermannSW
Tue Jan 29, 2019 8:11 pm
Forum: Camera board
Topic: Raspiraw images over or under exposed
Replies: 19
Views: 719

Re: Raspiraw images over or under exposed

@Lasse808, I found the error I made, and you made it more. /dev/shm filesystem gets full with 640x96 capturing at 841fps after a little more than 7s. /dev/shm filesystem gets full with 640x480 capturing at 180fps after a little more than 6.5s. I did now measure 640x96 for 7s (results in 99% /dev/shm...

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