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by HermannSW
Sun Jul 21, 2019 7:35 pm
Forum: Camera board
Topic: picamera - Actual framerate of V2 module is lower than expected
Replies: 2
Views: 88

Re: picamera - Actual framerate of V2 module is lower than expected

Hi, I tried doing same with raspivid and v2 camera, and the answer is "too many macroblocks". 6by9 will have to explain what that exactly means -- 60fps is good with level increase, 70fps and above fails: [email protected]:~ $ raspivid -md 6 -t 0 -p 22,50,960,540 -fps 50 Too many macroblocks/s: I...
by HermannSW
Sun Jul 21, 2019 7:17 pm
Forum: Camera board
Topic: ZeroCam NightVision - Question about the IR led
Replies: 4
Views: 82

Re: ZeroCam NightVision - Question about the IR led

Two years ago I did run into the same problems: https://www.raspberrypi.org/forums/viewtopic.php?t=182485 As 6by9 stated these IR leds should not get powered from Pi 3.3V rail, which they are when bolted to camera module. I was successful with using only one of the IR leds, see below. Be careful wha...
by HermannSW
Sun Jul 21, 2019 7:05 pm
Forum: Camera board
Topic: Camera about 30 to 60 cm from the Pi board.
Replies: 6
Views: 110

Re: Camera about 30 to 60 cm from the Pi board.

I have camera flex cables in different lengths, 15cm original, 30cm, 100cm and 200cm. For me the 1m and 2m cables work fine, see the 1m cable in photo below. But keep in mind that 6by9 always argues that 15cm should be the maximum, otherwise signals on the cable might become unstable. "raspivid -md ...
by HermannSW
Sun Jul 21, 2019 6:48 pm
Forum: Camera board
Topic: How to run raspiraw on Pi with 7" DPI display?
Replies: 2
Views: 51

Re: How to run raspiraw on Pi with 7" DPI display?

I did not think on my today's change of display. Just commented out the 7" DPI display stuff in /boot/config.txt and rebooted: [email protected]:~ $ tail -8 /boot/config.txt #dtoverlay=dpi24 #enable_dpi_lcd=1 #display_default_lcd=1 #dpi_group=2 #dpi_mode=87 #dpi_output_format=0x6f005 #hdmi_cvt 10...
by HermannSW
Sun Jul 21, 2019 6:41 pm
Forum: Camera board
Topic: How to run raspiraw on Pi with 7" DPI display?
Replies: 2
Views: 51

How to run raspiraw on Pi with 7" DPI display?

I did clone latest raspiraw repo on my Pi 3A+: https://github.com/6by9/raspiraw Raspberry v1 camera works without issues, as well as v2 camera. But I cannot get "/dev/i2c*" showing up, and without that raspiraw does not work: [email protected]:~/raspiraw $ ./camera_i2c setting GPIO for board revs...
by HermannSW
Sun Jul 21, 2019 3:07 pm
Forum: HATs and other add-ons
Topic: Qs on official Raspberry Pi [3]A+ Case
Replies: 4
Views: 898

Re: Qs on official Raspberry Pi [3]A+ Case

Today I took the 7" DPI display that was unused for 1 year since last vacation in Denmark, and prepared some PIs for the upcoming vacation: https://www.raspberrypi.org/forums/viewtopic.php?f=45&t=219214&p=1504536#p1504536 While the RGB LCD Hat does fit into the 3A+ case when viewed from top, the lef...
by HermannSW
Sun Jul 21, 2019 7:42 am
Forum: HATs and other add-ons
Topic: LCD, keyboard and Wifi make Raspberry laptop
Replies: 1
Views: 434

Re: LCD, keyboard and Wifi make Raspberry laptop

Last year I bought 7" Waveshare 1024x600 DPI display for use during 3 week vacation in Denmark. The display worked well, inclusive on train ride direction vacation. I did not use the display for a year now, and it is time to make the PIs work with it again, for upcoming 3 week vacation. Reason is th...
by HermannSW
Thu Jul 18, 2019 9:32 am
Forum: HATs and other add-ons
Topic: Raspberry pi zero display
Replies: 4
Views: 138

Re: Raspberry pi zero display

joural wrote:
Thu Jul 18, 2019 4:17 am
Ill go with 88x28mm
I guess thats near enough to "perfect"
Be aware that 88x28 is from PDF link for display only, the module is some millimeters longer:
Image
by HermannSW
Thu Jul 18, 2019 7:32 am
Forum: General discussion
Topic: Usefull / good programs to have on your Pi
Replies: 22
Views: 978

Re: Usefull / good programs to have on your Pi

Have they fixed the missing ESP8266/Wemos/ESP12 pieces yet? That one's solely on Espressif Systems. Their toolchain only builds on x86/x86_64. That is one of the reasons I sometimes have to use a x86 Linux laptop. Another reason is that Salea logic analyzer software does not run on arm as well :-( ...
by HermannSW
Thu Jul 18, 2019 2:13 am
Forum: HATs and other add-ons
Topic: Raspberry pi zero display
Replies: 4
Views: 138

Re: Raspberry pi zero display

Interesting question, I doubt that you will find a perfect fit. Pi0 dimensions are 65mmx30mm, that is a 2.82" diagonal: sqrt(65^2+30^2)/25.4 = 2.82 This is a two dimension overshoot 2.8" display (display alone is 57.6mm×47.2mm): https://www.aliexpress.com/item/33013348233.html This is a nearly perfe...
by HermannSW
Thu Jul 18, 2019 1:48 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Wiring 2.2" tft to pi zero w [Issues]
Replies: 1
Views: 142

Re: Wiring 2.2" tft to pi zero w [Issues]

You have the pin description on display board, and explanation of the pins on amazon product page (5th image). I used instructions in Kolban's (free) ebook on Raspberry Pi to easily connect ili9341 SPI displays: https://www.raspberrypi.org/forums/viewtopic.php?t=157618 After you will have successful...
by HermannSW
Tue Jul 16, 2019 3:55 am
Forum: Camera board
Topic: Raspberry v1 camera global (external) shutter videos
Replies: 26
Views: 2964

Re: Raspberry v1 camera global (external) shutter videos

It turned out that soldering cable to ESP32-CAM flat ribbon cable connector was not necessary for taking global (external) shutter frames with ov2640 sensor. Instead ov2640 sensor allows for: some kind of "implicit" global shutter mode global shutter capturing at daylight without external shutter mi...
by HermannSW
Sun Jul 14, 2019 7:35 am
Forum: Camera board
Topic: CAM1320 Module?
Replies: 3
Views: 415

Re: CAM1320 Module?

This seems to be the link @Traste wanted to add (module is based on ov13850 sensor): https://www.friendlyarm.com/index.php?route=product/product&product_id=228 You can get Arducam 13/16/18MP cameras that directly work plugged into Pi CSI-2 interface (the 13MP is based on imx135 sensor though): https...
by HermannSW
Sat Jul 13, 2019 2:06 pm
Forum: General discussion
Topic: ffmpeg to record 30 FPS video from 2M camera
Replies: 2
Views: 110

Re: ffmpeg to record 30 FPS video from 2M camera

Try "/dev/shm/xx.mp4" instead of "xx.mp4", if that is faster then SD card write is the bottleneck.
by HermannSW
Fri Jul 12, 2019 2:03 pm
Forum: Camera board
Topic: High framerate raspivid (initially 640x480 at 180fps)
Replies: 25
Views: 7701

Re: High framerate raspivid (initially 640x480 at 180fps)

Just to report success on 9kHz PWM flashes resulting in 9000eps frame captured. The airgun pellet got captured 10 times in this frame had speed 96.9m/s, with 96.9m/s / 9000Hz = 1.077cm between exposures. Comparing apples with oranges, but multiple exposure really allows for so much higher eps rates ...
by HermannSW
Fri Jul 12, 2019 1:50 pm
Forum: Camera board
Topic: The difference between capture_continuous and capture_sequence
Replies: 3
Views: 187

Re: The difference between capture_continuous and capture_sequence

> raspiraw allows a capture of raw data through the video port but that is restricted to more limited resolution and FOV as far as I can make out > Why? You can capture all modes with v1/v2 camera and raspiraw as described in the two tables in doc, search for "--mode": https://www.raspberrypi.org/do...
by HermannSW
Fri Jul 05, 2019 12:06 pm
Forum: Camera board
Topic: Review: Graspinghand gooseneck camera mount
Replies: 10
Views: 642

Re: Review: Graspinghand gooseneck camera mount

Today I got Scorpi B+ and tried it, with the first camera module I found and that was a v1 NoIR camera with 70mm lens: https://stamm-wilbrandt.de/en/forum/IMG_050719_133959.part.jpg Scorpi B+ is really dangerous with v1 NoIR clone camera! I first screwed the lower mounting whole and did not realize ...
by HermannSW
Thu Jul 04, 2019 1:57 pm
Forum: Camera board
Topic: Raspberry v1 camera global (external) shutter videos
Replies: 26
Views: 2964

Re: Raspberry v1 camera global (external) shutter videos

I am currently working on sub-project "ESP32-CAM ov2640 sensor global external shutter" and created a sub repo already: https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter/tree/master/FCameraWebServer The most difficult part after hardware reverse engineering the ov2640 sensor ...
by HermannSW
Thu Jul 04, 2019 6:52 am
Forum: Camera board
Topic: v2 camera can capture 1000fps videos ...
Replies: 34
Views: 8671

Re: v2 camera can capture 1000fps videos ...

> The main timing module is a GPS disiplined clock with thousandths resolution. 100 fps against this time source would be perfect. > Be aware that while you could do gstreamer timeoverlay in pipeline while recording, it will drop raspivid's framerate significantly. That was the reason that I did the...
by HermannSW
Wed Jul 03, 2019 10:30 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: PWM specs
Replies: 3
Views: 176

Re: PWM specs

What is the resolution of the PWM the pi3 is capable of (%DC)? With software PWM between 320Hz and 16000Hz with pigpio library: http://abyz.me.uk/rpi/pigpio/pigs.html#PFS How many pins on the header are PWM capable? All pins can do software PWM. In addition Pi allows for two hardware PWMs [GPIO(12|...
by HermannSW
Tue Jul 02, 2019 3:25 pm
Forum: Networking and servers
Topic: Raspberry PI with arduino = TCP/IP
Replies: 7
Views: 322

Re: Raspberry PI with arduino = TCP/IP

> on the Rpi > You don't state which Rpi, in case of Pi0 you need to add network connectivity either by USB OTG or enc28j60 network module: https://www.raspberrypi.org/forums/viewtopic.php?p=1015300#p1015300 You don't state which arduino, you can add network connectivity to AVR based Arduinos with e...
by HermannSW
Tue Jul 02, 2019 10:11 am
Forum: Camera board
Topic: v2 camera can capture 1000fps videos ...
Replies: 34
Views: 8671

Re: v2 camera can capture 1000fps videos ...

I forgot that I posted the exact steps needed in this posting:
https://www.raspberrypi.org/forums/view ... e#p1294557

For timestamp 8467.329 from .pts file:
Image
by HermannSW
Sun Jun 30, 2019 10:46 pm
Forum: Camera board
Topic: v2 camera can capture 1000fps videos ...
Replies: 34
Views: 8671

Re: v2 camera can capture 1000fps videos ...

You can capture Raspberry v2 camera with up to 120fps (limit is 200fps) as .h264 video with raspivid. Using -pts option you will get a file of microsecond reolution timestamps for each and every frame. Using mkvmerge you can merge the .h264 video and timestamps file into a video where each frame kno...
by HermannSW
Sun Jun 30, 2019 10:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Do GPIO output pins bounce?
Replies: 3
Views: 313

Re: Do GPIO output pins bounce?

To answer your question , GPIO outputs are glitch free. That is good to hear! I do control 38V/1.5A led drivers powering a 5000lm led via two 24V IRF520 mosfets in series. GPIO13 is connected to SIG pin of both IRF520 modules. When Pi GPIO13 goes from high to low I would expect this: ‾‾‾‾‾‾‾‾|_____...
by HermannSW
Sat Jun 29, 2019 8:08 pm
Forum: C/C++
Topic: Quick log2????
Replies: 35
Views: 1054

Re: Quick log2????

ARM has the "cnt" instruction to do that ("popcnt" on Intel). and gcc has the __builtin_popcount() intrinsic to produce the "cnt" instruction. Interesting, I did not know that. I looked up quite some documents on cnt and popcnt and cannot find information on the cycles the instructions need. Do you...

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