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by HermannSW
Thu Mar 21, 2019 1:50 am
Forum: Camera board
Topic: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)
Replies: 10
Views: 855

Re: utilizing frex and strobe pads for ov5647 (probable solution for rolling shutter issue?)

I had to debug a hardware issue in trying to do a sub-3µs total exposure global reset frame capture of a fast rotating mini drone propeller. But I can only work on that when back home on Friday when having access to the 5000lm led and the other stuff. I do have the Arducam ov5647 and a logic analyze...
by HermannSW
Wed Mar 20, 2019 4:18 pm
Forum: Camera board
Topic: NightVision Fisheye diameter? Anyone have one?
Replies: 2
Views: 54

Re: NightVision Fisheye diameter? Anyone have one?

Cheaper on aliexpress, starts at 11$ with free shipping:
https://www.aliexpress.com/w/wholesale- ... +raspberry
by HermannSW
Wed Mar 20, 2019 2:52 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

On Monday night I had everything wired together. Arducam ov5647 camera's (in motor test station) FREX and STROBE pins should power on 5000lm led on top of reflector on top plexiglas for say 40µs, in order to capture frame with 2.5µs exposure time only, then power the led off, in order to get first 2...
by HermannSW
Mon Mar 18, 2019 9:27 pm
Forum: Camera board
Topic: Is there any photo/video of flying rifle bullet done with v2 camera?
Replies: 23
Views: 1235

Re: Is there any photo/video of flying rifle bullet done with v2 camera?

The plan was to capture 5MP images with Arducam ov5647 camera. But running raspivid with mode 2 or 3 (5MP) leads to all kinds of issues (failed to enable port, too many macroblocks with Segmentation fault, ...). I gave up and will do 2MP images in mode 1 (1920x1080). This is a totem video player scr...
by HermannSW
Mon Mar 18, 2019 8:29 pm
Forum: Camera board
Topic: Is there any photo/video of flying rifle bullet done with v2 camera?
Replies: 23
Views: 1235

Re: Is there any photo/video of flying rifle bullet done with v2 camera?

I really wanted to start with sub-3µs exposure global reset videos of Arducam ov5647 today. My fist target was the outrunner propeller. I found a 150W/12V mains adapter I bought for my "unlimited inhouse drone flight" project, that can deliver 12V at 12.5A: http://forum.arduino.cc/index.php?topic=55...
by HermannSW
Mon Mar 18, 2019 12:44 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

I looked again at my statement that 0.24µs is the shortest strobe pulse length above, with setting "00 01" in registers "0x3b0[bc]". That was wrong, in fact registers 0x3b0[bc] are bits [19:4] or strobe length, bits [3:0] are stored in register 0x3b06[3:0]! Looking at the setting for register 0x3b06...
by HermannSW
Sun Mar 17, 2019 9:33 pm
Forum: Camera board
Topic: Is there any photo/video of flying rifle bullet done with v2 camera?
Replies: 23
Views: 1235

Re: Is there any photo/video of flying rifle bullet done with v2 camera?

Just trying 1007fps 640x150_s capturing of airsoft pistol bullet with Raspberry v2 camera. This was my initial setup, at the far end a little cardboard box with cardboard in front that has air behind allowing to swing back a bit and reduce the energy of the airsoft pistol bullet when being hit. A me...
by HermannSW
Sun Mar 17, 2019 2:03 pm
Forum: Camera board
Topic: Is there any photo/video of flying rifle bullet done with v2 camera?
Replies: 23
Views: 1235

Re: Is there any photo/video of flying rifle bullet done with v2 camera?

In order to have a high speed radial experiment for first "global reset with 2.65µs exposure = global shutter" photos/videos with Arducam ov5647 camera I did replace the thin cables with thick ones. And I repleced the 3S lipo with my constant-voltage power supply . That can only deliver 5A (instead ...
by HermannSW
Sun Mar 17, 2019 11:28 am
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

It took me one day to solder the FREX/STROBE/MOSFET logic circuit and debug it, but now I have it: https://stamm-wilbrandt.de/en/forum/IMG_170319_114719.jpg Later Arducam FREX and STROBE pins will get connected. I did solder a 10pin header with 2 pins for each of GND/FREX/MOSFET/VCC/STROBE. In this ...
by HermannSW
Sun Mar 17, 2019 11:10 am
Forum: Camera board
Topic: Jpeg compression On board or on RPI
Replies: 4
Views: 118

Re: Jpeg compression On board or on RPI

But there is a way to get the raw data so you can process everything yourself. A search will find that way. raspiraw: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=109137 Some guys have messed around with the cameras and got 1000fps sub sampling part of the image sensor. https://www.raspb...
by HermannSW
Fri Mar 15, 2019 8:13 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

I did the measurement again, this time in darkness and with 5000lm led, and now 2.4µs delay between falling signal edge of mosfet and falling laser sensor are measured: https://stamm-wilbrandt.de/en/forum/mosfet.laser.delay.2_4.png Here are part of the exported numbers: $ cat untitled.3.csv Time[s],...
by HermannSW
Fri Mar 15, 2019 6:32 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

It was the first time above that I did not look at the details in logic analyzer diagram and calculated wrongly. The corrected times in previous posting are already cool, but it comes better. I did the measurement again, in darkness, and now 1.1µs delay between falling signal edge of mosfet and fall...
by HermannSW
Fri Mar 15, 2019 4:25 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

I have no idea why I am not able to measure the output voltage of mosfet with logic analyzer. This time I used Arduino Uno because it has 5V logic, and the laser sensor I wanted to use operates at 5V. I used Arduino Blink example and triggered the IRF520 mosfet driver. I did use Arduino 5V as input ...
by HermannSW
Fri Mar 15, 2019 7:29 am
Forum: Camera board
Topic: Understanding the Pi Camera with a M12 lens/mount
Replies: 21
Views: 33451

Re: Understanding the Pi Camera with a M12 lens/mount

I wonder if anybody has gotten an M12 lens mounted on a Pi cam V2 in a reliable way. I did add M12 mount myself to v1 camera (clone): https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=45887&p=1279957#p1279957 And to v2 camera: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=45887&p=12...
by HermannSW
Thu Mar 14, 2019 8:52 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

Done with the cabling of the 3 ICs, and it really works. GPIO17 simulates the FREX pin, GPIO18 the STROBE pin. This is the simple code that sets the pin values for shown logic analyzer capture: $ for((i=0;i<3; ++i)); do gpio -g write 17 1; gpio -g write 18 1; gpio -g write 18 0; gpio -g write 17 0; ...
by HermannSW
Thu Mar 14, 2019 6:33 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

After having looked into 555 timer programming I did not like it. So I thought on using 84Mhz Arduino Due actively polling FREX pin on rising edge, then powering 5000lm led and doing microsecond range delay and finally power off the LED. Reading an Arduino Due port can be done in 3 clock cycles or 3...
by HermannSW
Thu Mar 14, 2019 12:03 am
Forum: Camera board
Topic: Is there any photo/video of flying rifle bullet done with v2 camera?
Replies: 23
Views: 1235

Re: Is there any photo/video of flying rifle bullet done with v2 camera?

and they looked like this 10$ 75mm reflector from aliexpress: https://www.aliexpress.com/item/75mm-Diameter-Optical-Reflector-Lens-Spherical-Surface-Parabolic-Reflector-Bow-COB-light-source-Reflection-cup-1PC/32965829520.html https://ae01.alicdn.com/kf/HTB1_a7EayHrK1Rjy0Flq6AsaFXaL/75mm-Diameter-Op...
by HermannSW
Wed Mar 13, 2019 11:28 pm
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

No other continuous shutter is needed, since the one-shot shutter described will just work continuously! Every new frame will trigger FREX pin high, that will turn on 5000lm led for T_delay time and the turn it off. This will be repeated for every frame, the logic will just have to act on rising FRE...
by HermannSW
Wed Mar 13, 2019 11:15 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 46
Views: 8581

Re: Hardware camera sync pulses

Thanks, my fault, I had to correct last line to: $ tail -1 /boot/config.txt disable_camera_led=3 $ There is a bug left, doing as shown before with GPIO21 leads again to camera not detected after reboot. With GPIO18 all is fine and I could see camera sync signals on logic analyzer after executing thi...
by HermannSW
Wed Mar 13, 2019 10:25 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 46
Views: 8581

Re: Hardware camera sync pulses

a) sorry b) [email protected]:~ $ vcgencmd version Nov 4 2018 16:35:17 Copyright (c) 2012 Broadcom version ed5baf9520a3c4ca82ba38594b898f0c0446da66 (clean) (release) [email protected]:~ $ c) I will try again, since the LED before the changes was on, I know that I had not configured disable_c...
by HermannSW
Wed Mar 13, 2019 4:45 pm
Forum: Camera board
Topic: Pi NoIR Camera v2 [IR settings]
Replies: 7
Views: 209

Re: Pi NoIR Camera v2 [IR settings]

As far as I'm aware it's an official Pi camera [came in the nice R Pi box 'Made in UK', etc...] Can you explain what you mean by 'there's no connection'? There are the four pins in the four corners of the camera board, which fit the holes in the two IR LEDs I bought. Forgive me, I'm a little confus...
by HermannSW
Wed Mar 13, 2019 4:30 pm
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 46
Views: 8581

Re: Hardware camera sync pulses

Have you modified the correct lines? As far as l can see your line numbers don't agree with the ones l have shown above. Because I had to do your edits for 3bplus section, you did for 3b section. Add -q to the dtc command line to shut up warnings. Now command runs without warnings. But the change (...
by HermannSW
Wed Mar 13, 2019 12:52 pm
Forum: Camera board
Topic: Is there any photo/video of flying rifle bullet done with v2 camera?
Replies: 23
Views: 1235

Re: Is there any photo/video of flying rifle bullet done with v2 camera?

One more speed to update (above table is new version already) -- I just received the airsoft pistol bullets, and I misread their weight. The product description states 0.12g(!) and not 1.2g. In fact they are a bit lighter, I did weigh 50 and the precision digital scale showed 5.8g, so one bullet doe...
by HermannSW
Wed Mar 13, 2019 10:29 am
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 46
Views: 8581

Re: Hardware camera sync pulses

Can anybody please help to get this working?
The description sofar seems to be incomplete, I followed the steps and ended with errors and non-function.
by HermannSW
Wed Mar 13, 2019 9:18 am
Forum: Camera board
Topic: ArduCam OV5647 Camera Board w/ M12 Mount
Replies: 12
Views: 543

Re: ArduCam OV5647 Camera Board w/ M12 Mount

I got you. So there are still next steps. First is to see what is the best result for rolling shutter capturing of RC airplane propeller with 180fps/1007fps framerates and v2 camera: https://www.raspberrypi.org/forums/viewtopic.php?t=190407#p1319617 The videos were taken at a time where I thought sh...

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