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by Gavinmc42
Tue Feb 19, 2019 12:03 am
Forum: Beginners
Topic: Stepper motor
Replies: 10
Views: 203

Re: Stepper motor

Nice CNC PCB
Start without the driver modules plugged in?

A LED on Direction and another on step, is what I use for Pi GPIO testing.
But because it uses the GBRL mega chip and not Pi's GPIO direct drive you need to look on those forums for answers
by Gavinmc42
Mon Feb 18, 2019 10:53 am
Forum: Gentoo
Topic: ebuilding 64bit games
Replies: 11
Views: 5090

Re: ebuilding 64bit games

Was looking for SVG to OpenVG source code and found Flightgear. The prerequisites was interesting as Open Scene Graph did compile just before my SD card cooked itself. http://home.flightgear.org/download/source-code/ Wonder if .... Anyway the SVG to OpenVG is what I was after, RPI based flight instr...
by Gavinmc42
Mon Feb 18, 2019 10:35 am
Forum: Beginners
Topic: Stepper motor
Replies: 10
Views: 203

Re: Stepper motor

And just get one motor turning to start with and start very slow.
When the motors starts twitching or buzzing you are getting close.

Tricky little things to get going the first time ;)
by Gavinmc42
Mon Feb 18, 2019 10:33 am
Forum: Camera board
Topic: V3 camera in the works?
Replies: 45
Views: 8041

Re: V3 camera in the works?

What is the problem with the quality at the moment? Not as good as one of these? https://en.wikipedia.org/wiki/Nikon_D850 Tiny CMOS images sensors are not going to give perfect pictures. Physics gets in the way, a lens that focused in the center of the flat image sensor will be out of focus at the ...
by Gavinmc42
Mon Feb 18, 2019 3:47 am
Forum: Python
Topic: Real time ECG arrhythmia algorithm
Replies: 4
Views: 83

Re: Real time ECG arrhythmia algorithm

Nice links.
Perhaps R could be used for analysis?

You might consider using a BLE transmitter sending the data to a Pi3/Android for analysis.
A BLE(Microbit?) does not use much power and gives the needed electrical isolation.
by Gavinmc42
Mon Feb 18, 2019 3:37 am
Forum: Camera board
Topic: V3 camera in the works?
Replies: 45
Views: 8041

Re: V3 camera in the works?

So global picture quality will not be better ? Picture quality is the result of lots of post processing of the raw image. Use the Pi to grab the raw image data and then run in through real PC image software. Pro photo guys usually work with raw image sensor data and tweak it lots. They do this beca...
by Gavinmc42
Mon Feb 18, 2019 3:20 am
Forum: Graphics, sound and multimedia
Topic: Bulletproof, lightweight video camera app
Replies: 3
Views: 89

Re: Bulletproof, lightweight video camera app

fswebcam? It also depends on the OS, I prefer PiCore Linux, boots a little faster and has less bloat than Raspbian. Most on my camera coding has moved to Ultibo baremetal as I like the 2sec boot times. But that said, my home secuirity system is using both Pikrellcam on Raspbian Lite and MotionEye OS...
by Gavinmc42
Sun Feb 17, 2019 10:23 am
Forum: Camera board
Topic: V3 camera in the works?
Replies: 45
Views: 8041

Re: V3 camera in the works?

[Wow ! Is theses modules fully compatible with picamera lib ? We have to add a lens mount and a lens if I understand well ? Does someone test theses devices ?/quote] I doubt they will be compatible with picamera lib, it looks like software and driver need to be installed. As RPF don't know about th...
by Gavinmc42
Sat Feb 16, 2019 10:42 am
Forum: Camera board
Topic: V3 camera in the works?
Replies: 45
Views: 8041

Re: V3 camera in the works?

If I read this right the VC4 ISP is not being used
https://www.visionproc.org/IU233_usage.php
That IU233 camera is plugged into a Pi3B, probably needs the 4 Arm cores to do the colour balance demosiacing etc

Pi's are becoming useful for developing vision applications on.
by Gavinmc42
Fri Feb 15, 2019 7:52 am
Forum: Camera board
Topic: V3 camera in the works?
Replies: 45
Views: 8041

Re: V3 camera in the works?

Global shutters and Starvis ones :D
These are serious industrial camera image sensors.
Just having them available may help with motivation to get drivers working.
Probably for the quad cores in ARM/NEON code.

Did anyone get Khronos OpenVX working on the Pi3B+?
by Gavinmc42
Fri Feb 15, 2019 7:28 am
Forum: Beginners
Topic: Need help with connecting the pi 3b+ with an unamed 2.8 inch touch lcd tft
Replies: 2
Views: 74

Re: Need help with connecting the pi 3b+ with an unamed 2.8 inch touch lcd tft

There is a good chance this will work, the 9341 driver chip is on the fbtft list .
https://github.com/raspberrypi/linux/tr ... ging/fbtft

Touch screen chip is another SPI port?
by Gavinmc42
Fri Feb 15, 2019 4:56 am
Forum: Beginners
Topic: Resistors and MOSFETs and fire-prevention, oh my
Replies: 106
Views: 1964

Re: Resistors and MOSFETs and fire-prevention, oh my

It will turn on at 3V3 volts but it will not be saturated. Figure 3 and 2 of the datasheet, show 25amps at -55C and perhaps 0.5V DS at 100amps, ie 50Watts of heat to dissipate. RDS on against VGS, notice how high RDSon goes when VGS is under 4V? I don't see the words "Logic level" in the data sheet?...
by Gavinmc42
Fri Feb 15, 2019 1:41 am
Forum: Networking and servers
Topic: Indoor positioning system using Rpi as AP
Replies: 3
Views: 113

Re: Indoor positioning system using Rpi as AP

Have a look at the new Bluetooth 5.1. There is a nice video that explains the new location stuff coming this year. Indoor accuracy is hard to do currently. Is it just one room all the whole Uni? Drone testing rooms have cameras in all corners. Laser range finders are now cheap and can measure distan...
by Gavinmc42
Thu Feb 14, 2019 11:52 am
Forum: Beginners
Topic: Resistors and MOSFETs and fire-prevention, oh my
Replies: 106
Views: 1964

Re: Resistors and MOSFETs and fire-prevention, oh my

Can I assist with the punctuation?
Yes please, I failed English and so had to do Engineering.
My new Windows10 and Edge does not do good suggested? , er what's it called again?
by Gavinmc42
Wed Feb 13, 2019 11:20 am
Forum: Beginners
Topic: Resistors and MOSFETs and fire-prevention, oh my
Replies: 106
Views: 1964

Re: Resistors and MOSFETs and fire-prevention, oh my

Mosfet transistors have a high gate capacitance, to turn them on and off fast, mosfet drivers chips are used. These can source and sink 2-4amps, the GPIO pins cannot do this. A high gate resistor will protect the Pi's GPIO but will charge and discharge the gate capacitance voltage changes slowly. Th...
by Gavinmc42
Wed Feb 13, 2019 4:12 am
Forum: Bare metal, Assembly language
Topic: Spider-OS a new operating system
Replies: 66
Views: 2331

Re: Spider-OS a new operating system

Cool link, was looking for something that explains that Depth buffer stuff.
Order seems to matter in OpenVG 2D stuff as I made shapes and edited them by putting black shapes over them to cut off sections.
Need to learn about layers and masking, need to learn lots of thing :oops:
by Gavinmc42
Wed Feb 13, 2019 3:36 am
Forum: Troubleshooting
Topic: My es2gears went black
Replies: 49
Views: 1220

Re: My es2gears went black

Yep, the fun of doing graphics without X11 ;)
Don't know why everyone insists on multi windowing, multi user, multi tscking OS's.
One user, one task, one window is much easier.
by Gavinmc42
Wed Feb 13, 2019 3:32 am
Forum: Other projects
Topic: raspberry pi PDA?
Replies: 14
Views: 288

Re: raspberry pi PDA?

Touch as a minimum with handwriting recognition a bonus over a screen based pop up or physical pop out keyboard Simple note taking with good search Clock Calendar / Diary / Bullet Journal Calculator List manager (the dreaded task / shopping list part of Bullet Journalling) Book reader Alarm reminde...
by Gavinmc42
Tue Feb 12, 2019 11:59 pm
Forum: The MagPi
Topic: Proposal for a small robot controller based on RPi Zero
Replies: 8
Views: 165

Re: Proposal for a small robot controller based on RPi Zero

This is one of the better motor driver boards I have seen. https://www.pololu.com/product/2753 But for me it is missing stuff. An IMU chip - accel/gyro/compass, i2c connector for addon sensors, some servo 3 pin headers.... Ideally the addon board is about the same price as the Zero, that leaves no r...
by Gavinmc42
Tue Feb 12, 2019 7:21 am
Forum: Beginners
Topic: RPI Zero W multiple sensors
Replies: 21
Views: 432

Re: RPI Zero W multiple sensors

I want a micro greens factory, growing just enough for daily consumption. Grew some lettuce once, they all grew at the same rate. You just cannot eat 20 lettuce a week, unless you are rabbit? And they don't keep or freeze :( And if you don't pick them they shrivel or go to seed. A sprout factory, co...
by Gavinmc42
Tue Feb 12, 2019 2:47 am
Forum: Off topic discussion
Topic: Windows 10 (not IoT) on Raspberry Pi gets USB drivers
Replies: 25
Views: 830

Re: Windows 10 (not IoT) on Raspberry Pi gets USB drivers

Too complicated, if it is not easy why bother?
Windows is not that great a system anyway for learning on.
by Gavinmc42
Tue Feb 12, 2019 12:21 am
Forum: Bare metal, Assembly language
Topic: Spider-OS a new operating system
Replies: 66
Views: 2331

Re: Spider-OS a new operating system

Some of this can be done in hardware, if I have understood the VC4 manual enough. pik33 understands some of the limitations better than me.. https://ultibo.org/forum/viewtopic.php?f=9&t=584&hilit=Windowing+manager Think of the Desktop as a 3D scene those objects further away behind other objects don...
by Gavinmc42
Mon Feb 11, 2019 11:59 pm
Forum: Off topic discussion
Topic: Why Avoid BASIC on RPi?
Replies: 1377
Views: 51349

Re: Why Avoid BASIC on RPi?

Hey D looks easier to read than C++, even got bit manipulation, so good for those little embedded micros? I really did not want to learn another language but this looks worthwhile. I do think it is real cool that we can use these languages on Pi's. Sure they may not be the faster compiler boxes arou...
by Gavinmc42
Mon Feb 11, 2019 11:38 pm
Forum: General discussion
Topic: Easily run 64-bit Debian Stretch packages on a Raspbian system: new RPi3 demo image released (systemd-nspawn, LXDE)
Replies: 65
Views: 2585

Re: Easily run 64-bit Debian Stretch packages on a Raspbian system: new RPi3 demo image released (systemd-nspawn, LXDE)

Got my new Pi Desktop box but no mSATA drive yet. https://au.element14.com/element14/pi-desktop/element-14-pi-desktop-hatencl/dp/268714202?ICID=I-HP-PP-ELEMENT14-PI-DESKTOP-MAY So I am using this on a 32GB Lexar micro USB stick, did not even bother with uSD. Working fine with two Chromium browsers a...
by Gavinmc42
Mon Feb 11, 2019 11:28 am
Forum: General discussion
Topic: Chromium Browser and Amazon Music
Replies: 7
Views: 202

Re: Chromium Browser and Amazon Music

Just installed the 64bit Chromium it is 69.0.3497.92

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