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by HermannSW
Thu Sep 20, 2018 10:22 am
Forum: Camera board
Topic: Frames dropped the longer the recording with raspivid
Replies: 4
Views: 198

Re: Frames dropped the longer the recording with raspivid

> and tried recording 200 fps video > Please note that the Raspberry Pi GPU has a bug not allowing 202fps or higher. And @6by9 always states that 120fps is save to use for 640x480. I have seen problems with 200fps as you, but 180fps is fine for me. It seems that 200fps being so near to the 202fps GP...
by HermannSW
Tue Sep 18, 2018 10:07 am
Forum: Add-ons
Topic: Can I run a Raspberry-Pi 3 B+ with 5" LCD touchscreen on Rechargeable batteries?
Replies: 4
Views: 126

Re: Can I run a Raspberry-Pi 3 B+ with 5" LCD touchscreen on Rechargeable batteries?

I only have a Pi ZeroW and 2.2" display in my mobile box, but with 3S lipo and LM2596 step-down converter you will surely be able to have a mobile 3B+ with display:
https://www.raspberrypi.org/forums/view ... 5&t=222525


Image
by HermannSW
Thu Sep 13, 2018 3:18 pm
Forum: General discussion
Topic: How to make sure the framerates is 40 fps in pi camera V2.x mode 4 ?
Replies: 1
Views: 52

Re: How to make sure the framerates is 40 fps in pi camera V2.x mode 4 ?

"-fps 40" is correct.
You can get frame timestamps with "-pts timecodes.txt".
Finally you can analyze the generated file with:
https://github.com/Hermann-SW/userland/ ... ptsanalyze
by HermannSW
Thu Sep 13, 2018 8:17 am
Forum: Add-ons
Topic: Powering Pi from 3S lipo with LM2596 step-down converter
Replies: 6
Views: 178

Re: Powering Pi from 3S lipo with LM2596 step-down converter

Thanks again, I did the test, disconnected the cables coming from LM2596 and directly plugged the 600mAh 25C 1S lipo onto pins 4+6 -- works perfectly, and reliably. Did some tests, graphics on screen, accessing internet, ... no problems. Now I need to find cables that can deliver >1A which the bread...
by HermannSW
Thu Sep 13, 2018 8:04 am
Forum: Add-ons
Topic: Powering Pi from 3S lipo with LM2596 step-down converter
Replies: 6
Views: 178

Re: Powering Pi from 3S lipo with LM2596 step-down converter

Thanks, that is a good point. I don't want to look inside the 2mm(?) cables. But I assume the 25C lipo rating would not make sense if the lipo cables could not do 25*0.6=15A. But you pointed to the problem, I used small breadboard cables to connect the lipo connector to Pi ZeroW GND/5V pins. I will ...
by HermannSW
Thu Sep 13, 2018 12:07 am
Forum: Add-ons
Topic: Powering Pi from 3S lipo with LM2596 step-down converter
Replies: 6
Views: 178

Re: Powering Pi from 3S lipo with LM2596 step-down converter

Hi,

as I said output voltage is only needed to adjust to 5V once, LM2596 output voltage range is 1.25V ~ 37V.

My question is why the potential 15A for 1S lipo directly connected to GND/5V Pi pins do not sufffice driving ZeroW+Wifi+LCD+wireless dongle.
by HermannSW
Wed Sep 12, 2018 7:56 pm
Forum: Add-ons
Topic: Powering Pi from 3S lipo with LM2596 step-down converter
Replies: 6
Views: 178

Powering Pi from 3S lipo with LM2596 step-down converter

Until recently I did run several Pi Zero[W]s from 1S lipo (nominal 3.7V, fully loaded 4.2V) by directly connecting to Pi GND/5V pins. This stopped to work (steady reboots, directly when LCD gets initialized) for my first mobile Pi ZeroW. It seems that Pi CPU, Pi Wifi, 320x240 SPI LCD and wireless ke...
by HermannSW
Wed Sep 12, 2018 7:19 pm
Forum: Automation, sensing and robotics
Topic: PiDrone
Replies: 1
Views: 189

Re: PiDrone

No Raspberry pin can deliver 300mA, so you need a motor controller for each motor. Assuming your drone is a quadcopter, two motors run clockwise, and two run counterclockwise. Therefore you need a one direction motor controller only. I used these cheap little MOSFET buttons a lot (for running circul...
by HermannSW
Wed Sep 12, 2018 11:47 am
Forum: General discussion
Topic: Rpi connect to external hotspot
Replies: 1
Views: 47

Re: Rpi connect to external hotspot

This can be a start:

Code: Select all

iwlist wlan0 scanning | grep ESSID
by HermannSW
Wed Sep 12, 2018 8:58 am
Forum: Raspbian
Topic: Will people please think about low res displays?
Replies: 45
Views: 1206

Re: Will people please think about low res displays?

I had no problems with my 7" 1024x600 non-touch dipslay. But recently I built my first mobile Pi ZeroW and used it in 40x15 console mode on 320x240 SPI LCD. Most was fine, and most importantly "vi" (I use since 28 years) is cool. But "sudo raspi-config" did display stuff outside the visible area. So...
by HermannSW
Tue Sep 11, 2018 1:46 pm
Forum: General discussion
Topic: Error while attemption GPIO loopback test "operation not permitted" "
Replies: 2
Views: 93

Re: Can any one help please?

gpio utility just works, try it:
http://wiringpi.com/the-gpio-utility/

Code: Select all

$ gpio -g mode 17 OUT
$ gpio -g mode 18 IN
$ gpio -g write 17 0
$ gpio -g read 18
0
$ gpio -g write 17 1
$ gpio -g read 18
1
$ 
by HermannSW
Tue Sep 11, 2018 12:55 pm
Forum: General discussion
Topic: need advice on screen for zero w without desktop
Replies: 4
Views: 150

Re: need advice on screen for zero w without desktop

https://www.aliexpress.com/wholesale?SearchText=ili9341+module I have 2.2" ili9341 modules, but you can get 2.4", 2.8" and 3.2" as well, all for <10$ and with SD card reader at bottom (that is most useful when using these modules with Arduinos). My first link describes the cabling (how to connect t...
by HermannSW
Tue Sep 11, 2018 12:41 pm
Forum: Raspbian
Topic: "con2fbmap 1 1" in "/etc/rc.local" only after 66 seconds, better place?
Replies: 2
Views: 74

Re: "con2fbmap 1 1" in "/etc/rc.local" only after 66 seconds, better place?

Thank you, appending "fbcon=map:10" to /boot/cmdline.txt did the trick! Since that maps tty1 to fb1 at the start, console output starts when display gets initialized after 22 seconds. This is very useful since now I can see everything after 22 seconds, including file system check that increases boot...
by HermannSW
Tue Sep 11, 2018 9:49 am
Forum: Raspbian
Topic: "con2fbmap 1 1" in "/etc/rc.local" only after 66 seconds, better place?
Replies: 2
Views: 74

"con2fbmap 1 1" in "/etc/rc.local" only after 66 seconds, better place?

After powering Pi ZeroW the SPI display gets black (initialized) after 21 seconds. But only after 66 seconds the last boot messages in console get displayed. I am searching where I have to do "con2fbmap 1 1" better than in "/etc/rc.local" (66s). I have this in "/etc/modules-load.d/fbtft.conf": spi-b...
by HermannSW
Tue Sep 11, 2018 9:28 am
Forum: General discussion
Topic: need advice on screen for zero w without desktop
Replies: 4
Views: 150

Re: need advice on screen for zero w without desktop

Yes (you can even connect two SPI displays if needed as /dev/fb1 and /dev/fb2). https://www.raspberrypi.org/forums/viewtopic.php?t=157618#p1214626 Last weekend I built my 1st mobile Pi with that (with power switch and reset button): https://twitter.com/HermannSW/status/1038781298968547328 https://st...
by HermannSW
Fri Sep 07, 2018 2:56 pm
Forum: Troubleshooting
Topic: "sudo ifup wlan0" shows "unknown interface wlan0"
Replies: 8
Views: 1910

Re: "sudo ifup wlan0" shows "unknown interface wlan0"

Try these sudo ip link set wlan0 down sudo ip link set wlan0 up Thank you, that worked for me while ifup did not. Pi ZeroW was connected to ESP-01s module access point. For some reason the connection dropped and "ip link show" showed wlan0 in DORMANT state. First I tried only your 2nd command, that...
by HermannSW
Wed Sep 05, 2018 7:06 pm
Forum: Camera board
Topic: Pi Camera vs USB WebCam for OpenCV
Replies: 5
Views: 295

Re: Pi Camera vs USB WebCam for OpenCV

I cannot help on USB, but say that I was negatively impressed on OpenCV performance. Edge detection on small 320x208 frames took 20ms(!), not allowing for high framerate video processing: https://www.raspberrypi.org/forums/viewtopic.php?p=1232058#p1250429 The robot target speed is 5m/s, and getting ...
by HermannSW
Wed Sep 05, 2018 6:30 pm
Forum: Camera board
Topic: Cheap RC airplane with "outboard" Pi Zero and camera
Replies: 41
Views: 9112

Re: Cheap RC airplane with "outboard" Pi Zero and camera

Thanks for all that information, I will try after drone bromb dropped (hopefully) lost drone in 10m height and lost airplane in 20m height, and having Pi ZeroW autonomous fly the E52 drone as onboard pilot ... What I meant by horizontally was joining my two airplanes at the wings, and fly both airpl...
by HermannSW
Wed Sep 05, 2018 6:02 pm
Forum: Camera board
Topic: ArduCAM 8MP IMX219 with M12 LS40136 Lens
Replies: 5
Views: 200

Re: ArduCAM 8MP IMX219 with M12 LS40136 Lens

dankeschön, hermann. i've just realized that most m12 lenses already come with a low cut filter mounted, not sure, these are the M12 lenses I bought, used and described in postings: 3.98°, most expensive (9$) 20° 65° 130° 1/3" 2.1mm 150 Degrees Wide Angle CCTV Lens IR Board M12 for AHD TVI CVI 1080...
by HermannSW
Wed Sep 05, 2018 2:09 pm
Forum: Camera board
Topic: Cheap RC airplane with "outboard" Pi Zero and camera
Replies: 41
Views: 9112

Re: Cheap RC airplane with "outboard" Pi Zero and camera

... I crash flight simulators, I wouldn't try a plane I'd spent money on. I was lucky on last Sunday recce flight with drone, drone should not be above trees when lipo is drained. After 5 long seconds of drone fall through 10m high tree it ended up on ground without any issues: https://stamm-wilbra...
by HermannSW
Wed Sep 05, 2018 1:36 pm
Forum: Camera board
Topic: ArduCAM 8MP IMX219 with M12 LS40136 Lens
Replies: 5
Views: 200

Re: ArduCAM 8MP IMX219 with M12 LS40136 Lens

For v1 camera you get cheap cameras with lense if you search for NoIR. I don't know of any v2 camera being sold with lense, was surprised to see the arducam you mentioned. I did add M12 lense mount and different lenses to one of my v1 cameras first. Then I did same for my only v2 camera, all was eas...
by HermannSW
Wed Aug 29, 2018 5:05 pm
Forum: General discussion
Topic: wireless keyboard for raspbian lite on pi zero
Replies: 6
Views: 219

Re: wireless keyboard for raspbian lite on pi zero

Pi Zero has no bluetooth, so no. Pi ZeroW has bluetooth. I use wireless keyboard with dongle, that would work with Pi Zero with USB converter. I did order it again as backup after realizing it does cost less than 5$ with free shipping: https://www.aliexpress.com/item/English-2-4GHz-Wireless-i8-Keybo...
by HermannSW
Wed Aug 29, 2018 2:02 pm
Forum: Camera board
Topic: M12 lens adapter for camera module
Replies: 78
Views: 64832

Re: M12 lens adapter for camera module

> How did you manage to get rid of it in the last pictures you posted?
>
I did nothing but mounting a new lens as is without any change in hardware or software and take the images with lens in focus.
by HermannSW
Wed Aug 29, 2018 9:02 am
Forum: General discussion
Topic: Raspberry pi zero W with camera and 2 IR Led case
Replies: 3
Views: 117

Re: Raspberry pi zero W with camera and 2 IR Led case

> However I find it very strange that there is no protective case available in the market for this setup. > I have no problems using the 3W IR leds powered from the camera as shown in picture top right. But that is v1 camera clone and not supported by Raspberry foundation. The (official) v2 camera d...

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