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by Gavinmc42
Tue Apr 04, 2017 2:23 am
Forum: Camera board
Topic: Can the NOIR Camera do NIRS?
Replies: 3
Views: 1110

Re: Can the NOIR Camera do NIRS?

Short answer, NO. If this is what you are talking about https://en.wikipedia.org/wiki/Near-infrared_spectroscopy If you use a below 700nm visible light block, the NOIR camera will detect from 700 to about 1000nm. But you will not get a spectrum histogram as the RGB filters are different in that rang...
by Gavinmc42
Tue Apr 04, 2017 1:50 am
Forum: Beginners
Topic: Control Arduino Stepper Motor With Pi?
Replies: 5
Views: 1703

Re: Control Arduino Stepper Motor With Pi?

Ok, The Arduino stepper library would be useful to look at too The 28BYJ-48 geared stepper motor seems to be popular because of the cheap price. If you google that number, lots of info will pop up. The reference guide to steppers is Jones, quite old but it still explains the basics. http://homepage....
by Gavinmc42
Mon Apr 03, 2017 3:50 am
Forum: Graphics, sound and multimedia
Topic: Music Playing OS?
Replies: 2
Views: 650

Re: Music Playing OS?

pik33 has been working on a SID player.
viewtopic.php?f=38&t=150154&p=1072969&h ... 3#p1072969

Getting mp3, oggs to play next?
Ok mp3's working, did not know that, missed that.
https://github.com/pik33/ultibo-retro-sid
by Gavinmc42
Mon Apr 03, 2017 3:41 am
Forum: Automation, sensing and robotics
Topic: ARM compute library
Replies: 5
Views: 4074

ARM compute library

Found this recently https://developer.arm.com/technologies/compute-library ARM have released a library that should be useful for vision and machine learning. I have resisted learning OpenCV because it is a bit bloated, this looks much easier to use. It is only ARMv7 and ARM64-v8A so it won't be usef...
by Gavinmc42
Mon Apr 03, 2017 2:36 am
Forum: Beginners
Topic: Control Arduino Stepper Motor With Pi?
Replies: 5
Views: 1703

Re: Control Arduino WIth Stepper Motor?

Not sure what the question is? Or why Arduino is in the title? But I have been playing with those steppers in the last week. This is some test code I use. First one is a setupgpio.sh file that must run on boot. The second is some Micropython code that I run on piCore Linux This code is file based an...
by Gavinmc42
Sun Apr 02, 2017 11:37 am
Forum: Automation, sensing and robotics
Topic: l298n + stepper motor and a pi help
Replies: 6
Views: 2525

Re: l298n + stepper motor and a pi help

I keep forgetting Joan stuff is DMA.
Not sure if I have seen steppers done with the wave gen method?

Unipolar example
https://github.com/stripcode/pigpio-stepper-motor

Maybe more googling will find something
by Gavinmc42
Sun Apr 02, 2017 6:52 am
Forum: Other projects
Topic: 3 touch screens with Rasberry Pi Zero
Replies: 7
Views: 1542

Re: 3 touch screens with Rasberry Pi Zero

Quick SPI lesson https://en.wikipedia.org/wiki/Chip_select SS is the slave selector or chip select input. The Wiki shows SS1, SS2, SS3 but the Pi only has two called CS0, CS1. A mux or expander can have 2 CS inputs and 4 CS outputs. It uses an extra GPIO input to select which 2 of the 4 outputs are ...
by Gavinmc42
Sun Apr 02, 2017 6:39 am
Forum: General discussion
Topic: Raspberry Pi 4 possible h.265 decoder?
Replies: 63
Views: 79298

Re: Raspberry Pi 4 possible h.265 decoder?

USB 3 the must have for future I/O speed? No 1Gbs Lan9514, but there is a USB3 LAN7801 but it has no USB hub. So maybe two USB ports USB3 and USB2? Anything with a Linux driver can be recompiled for ARM. So perhaps a LAN/Hub chip change? Not keen on RJ45 sockets for Lan, they seem so big these days....
by Gavinmc42
Sun Apr 02, 2017 4:16 am
Forum: Other projects
Topic: 3 touch screens with Rasberry Pi Zero
Replies: 7
Views: 1542

Re: 3 touch screens with Rasberry Pi Zero

These would be SPI screens?
There is only two CE pins, but these could be muxed with GPIO help.

Drivers?
Price of a Zero, use three of them :lol:
by Gavinmc42
Sun Apr 02, 2017 4:13 am
Forum: General discussion
Topic: Raspberry Pi 4 possible h.265 decoder?
Replies: 63
Views: 79298

Re: Raspberry Pi 4 possible h.265 decoder?

there have to be a huge software effort to port to a new boot sequence and work with a different (and completely incompatible) GPU. Good point, as a hardware guy I keep forgetting the effort needed to do the software ;) So die shrink and maybe 1.5Ghz but still run cooler, overclock to 1.8GHz? VC4 w...
by Gavinmc42
Sun Apr 02, 2017 1:03 am
Forum: Camera board
Topic: Pi NOir Camera for license plates
Replies: 11
Views: 3709

Re: Pi NOir Camera for license plates

At only 10 m distance, sounds like your camera is right up by the curb. Just over 1M from fence, aimed up the road, picture shrunk to save space, normally much better. 15meters of conduit to the camera post with a 12V diy POE. Area of interest is about 10meters away in that shady spot. Standard len...
by Gavinmc42
Sat Apr 01, 2017 11:38 pm
Forum: Automation, sensing and robotics
Topic: l298n + stepper motor and a pi help
Replies: 6
Views: 2525

Re: l298n + stepper motor and a pi help

I normally use microstep drivers for NEMA steppers. Pololu have a bunch of PCBs. L298 is old tech, expect things to get warm. Adafruit have good tuts https://www.adafruit.com/?q=stepper& Also know it will be hard to get good/smooth control on a Linux OS on a Pi via the GPIO. GPIOZERO is ok for DC mo...
by Gavinmc42
Sat Apr 01, 2017 11:29 pm
Forum: General discussion
Topic: Raspberry Pi 4 possible h.265 decoder?
Replies: 63
Views: 79298

Re: Raspberry Pi 4 possible h.265 decoder?

And they are just fine as they stand. Yep, I still have an original model A in the field, still working fine after nearly 5years. h.265 is totally irrelevant to what I use them for, that said I use them within their limits. If a Pi4 or 5 or 6 comes with h.265, AV1 or whatever I am sure I can come u...
by Gavinmc42
Sat Apr 01, 2017 12:20 pm
Forum: Automation, sensing and robotics
Topic: Reading RF signals
Replies: 3
Views: 1794

Re: Reading RF signals

You can use some USB TV tuners as wide band radios. ie simple scanner or a not so simple scanner ;) http://www.rtl-sdr.com/about-rtl-sdr/ http://www.instructables.com/id/How-to-Make-a-19-Police-Radio-Scanner/ https://www.adafruit.com/products/1497 https://learn.adafruit.com/freq-show-raspberry-pi-rt...
by Gavinmc42
Sat Apr 01, 2017 11:40 am
Forum: General discussion
Topic: Raspberry Pi 4 possible h.265 decoder?
Replies: 63
Views: 79298

Re: Raspberry Pi 4 possible h.265 decoder?

WebRTC? Ok, AV1 is worth waiting for, RPF take your time :lol: Die shrink to 28nm should help with the power? Quad ARMv8-A73 and quad ARMv8-R52. The R52's for real time control stuff. Of course by the time it is designed better cores will be out :lol: Use A35's in the next Zero/A+/B+, full 64 bit fa...
by Gavinmc42
Sat Apr 01, 2017 11:06 am
Forum: Automation, sensing and robotics
Topic: Robot LiFePO4 batteries
Replies: 0
Views: 523

Robot LiFePO4 batteries

Recently a google found LiFePO4 selling on Amazon 16 x AA for < $20USD So when I was at the hardware store I checked the solar lighting section. Sure enough, LiFePO4 are there in the replacement battery section of solar lighting. What was surprising was they were Duracell. Two sizes, 18500 - 18mm di...
by Gavinmc42
Sat Apr 01, 2017 10:27 am
Forum: General discussion
Topic: Differences on socat on PI vs Ubuntu?
Replies: 11
Views: 2198

Re: Differences on socat on PI vs Ubuntu?

Linux raspberrypi 4.4.50+ #970 Mon Feb 20 19:12:50 GMT 2017 armv6l GNU/Linux ,all updates and its a Zero so all hangs on a USB hub, USB ethernet and USB serial port.
First post says it is a Zero running armv6?
But you are running armv7 socat?
by Gavinmc42
Sat Apr 01, 2017 5:27 am
Forum: Camera board
Topic: Pi NOir Camera for license plates
Replies: 11
Views: 3709

Re: Pi NOir Camera for license plates

JBeale,

Is that photo with just with one IRLED?

All plates are retroreflective? not sure if ours in OZ are, time to test.
Much better results than I expected, I only need 10meters.
by Gavinmc42
Sat Apr 01, 2017 1:26 am
Forum: General discussion
Topic: Portable Robot Power: Pimoroni Zero LiPo or PowerBoost 1000?
Replies: 4
Views: 1396

Re: Portable Robot Power: Pimoroni Zero LiPo or PowerBoost 1

Good luck powering the motors too.
Unless you use low current ones, most toy motors draw a lot of power.
by Gavinmc42
Sat Apr 01, 2017 1:10 am
Forum: Other projects
Topic: pi 3 surveillance system
Replies: 1
Views: 773

Re: pi 3 surveillance system

Which motion software?

I use MotionEye OS which is Buildroot based and Pikrellcam on Jessie lite.
Both work fine and easy enough installs.
by Gavinmc42
Sat Apr 01, 2017 12:46 am
Forum: General discussion
Topic: Raspberry Pi 4 possible h.265 decoder?
Replies: 63
Views: 79298

Re: Raspberry Pi 4 possible h.265 decoder?

That's very old news And so is the VC4 design ;) Ok, h.265 added to the list with USB3, 1Gb Ethernet, 2GB ram and 4K video, SATA? Maybe just h.265 in hardware and a few USB C connectors. Keep same footprint use 2 USB -C instead of HDMI connector. Could make it smaller but why? We have Zero's GPIO a...
by Gavinmc42
Fri Mar 31, 2017 1:57 pm
Forum: General discussion
Topic: Raspberry Pi 4 possible h.265 decoder?
Replies: 63
Views: 79298

Re: Raspberry Pi 4 possible h.265 decoder?

don't see why the Pi can't incorporate hardware h265 support too, maybe someone can explain to me why Hardkernel can do it but Pi can't? https://www.arm.com/files/event/Mali_Partner_Track_4_GPU_Compute_accelerated_HEVC_decoder_on_ARM_Mali-T600_GPUs.pdf Page 12 HEVC is a newly ratified standard and ...
by Gavinmc42
Fri Mar 31, 2017 1:28 pm
Forum: General discussion
Topic: Differences on socat on PI vs Ubuntu?
Replies: 11
Views: 2198

Re: Differences on socat on PI vs Ubuntu?

running on Linux version #970 SMP Mon Feb 20 19:18:29 GMT 2017, release 4.4.50-v7+, machine armv7l
Zero is armv6? wrong version?
by Gavinmc42
Fri Mar 31, 2017 12:40 pm
Forum: General discussion
Topic: Differences on socat on PI vs Ubuntu?
Replies: 11
Views: 2198

Re: Differences on socat on PI vs Ubuntu?

Have tried on a normal Pi not a Zero?
Socat worked fine for me
by Gavinmc42
Fri Mar 31, 2017 3:11 am
Forum: Beginners
Topic: 2 Servo Motor Control
Replies: 4
Views: 3621

Re: 2 Servo Motor Control

Add a pause between each step. This gives time for the motors/gears to move. You have loops but no delay to allow the servos to catch up You could write a program to do 10 complete 180 moves and time them. Servos are not instantaneous, they might take 0.5 -0.8sec to move. It depends on the servos wh...

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