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by Gavinmc42
Mon Mar 30, 2020 2:04 am
Forum: Teaching and learning resources
Topic: Lockdown home schooling
Replies: 18
Views: 625

Re: Lockdown home schooling

Smartphone based video conferencing?
Just download the app.

Solutions are in the works now.
In Oz they are talking paper based learning for those without internet/PC's.
Mailman will be busy.
by Gavinmc42
Sun Mar 29, 2020 4:03 am
Forum: General discussion
Topic: Apt-Get Blender 2.8
Replies: 10
Views: 1695

Re: Apt-Get Blender 2.8

Blender 2.8 won't happen unless it can be compiled for OpenGLES 3.0 or 3.1.
When Vulkan is working on Pi4 then there might be a chance.

Inkscape works.
Love2D?
by Gavinmc42
Sun Mar 29, 2020 3:55 am
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 971

Re: Call for help: looking to start a company - solar powered computer

Depends on the battery technology. Phone batteries last until the next model which is 6 months ;) Some chemistries will last 100 years+, Nickel Iron. Lithium Titanite is good for 20years 20,000 cycles. Lead based ones might last a few-5 years but are about 98% recycled. Super capacitors are in the m...
by Gavinmc42
Sat Mar 28, 2020 3:00 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Solar Power and Li Cell
Replies: 1
Views: 92

Re: Raspberry Pi Solar Power and Li Cell

Do what robot vacuum cleaners do, have a base station. The solar panel will be quite big so put that on the basestation. Then have a roaming bot that comes home to feed.(recharge). I'm becoming fan of Lithium Titanate cells for the roaming bot as they have a long life and fast charge. Still hard to ...
by Gavinmc42
Sat Mar 28, 2020 2:50 am
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 971

Re: Call for help: looking to start a company - solar powered computer

The idea is to make an amateur radio that sends and receives text messages... might use less bandwith that voice! Might be possible to work only on solar power.. worldwide. Have a look at LoRa Plenty of people are launching satellites that use that, emails to anywhere on the planet? They can run fr...
by Gavinmc42
Sat Mar 28, 2020 2:47 am
Forum: Advanced users
Topic: 2D Indoor tracking for autonomous car
Replies: 6
Views: 162

Re: 2D Indoor tracking for autonomous car

People have used optical mouse parts to track movement. That eliminates wheel slip and motor speed variations. Stepper motors are good for straight travel, wheel slip is still an issue. Super grippy wheels help, google Sumo bot wheels. DC motors without encoders and speed control will give curved tr...
by Gavinmc42
Fri Mar 27, 2020 6:14 am
Forum: Advanced users
Topic: 2D Indoor tracking for autonomous car
Replies: 6
Views: 162

Re: 2D Indoor tracking for autonomous car

I'm still waiting for Bluetooth 5.1 positioning base stations to come onto the market. There are some 5.1 modules now but I have not seen the base stations with the require antennas. It would be handy if they were built into Exit signs and other standard fittings. A total surveillance state would ha...
by Gavinmc42
Fri Mar 27, 2020 12:49 am
Forum: Off topic discussion
Topic: Call for help: looking to start a company - solar powered computer
Replies: 31
Views: 971

Re: Call for help: looking to start a company - solar powered computer

I am looking to build a team of people dedicated on working on some alternative computer system to compete with Apple and co. Elon, is that you? Solar powering Pi's requires about a 20-100watt panel plus batteries. Low power computing is possible, just not with "normal" CPU chips. Fanless but not q...
by Gavinmc42
Thu Mar 26, 2020 8:15 am
Forum: General discussion
Topic: what happened to the raspberry pi 4 1GB?
Replies: 23
Views: 778

Re: what happened to the raspberry pi 4 1GB?

Think of the 1GB Pi4 as a collectors item.
Like a vintage car that only goes 30mph and has 3 wheels?
by Gavinmc42
Thu Mar 26, 2020 1:26 am
Forum: Teaching and learning resources
Topic: Lockdown home schooling
Replies: 18
Views: 625

Re: Lockdown home schooling

I could work from home but most of the software I need runs on Windows. That would require taking my PC back from the kid, hence there will be a lot of shouting. A rigid schedule might fix that, which has some other benefits ;) as for the home schooling, the only rough edges I have encountered with ...
by Gavinmc42
Thu Mar 26, 2020 1:01 am
Forum: Beginners
Topic: attach pH,Ec and temperature to rasp4
Replies: 4
Views: 150

Re: attach pH,Ec and temperature to rasp4

Ion migration is one issue with these types of sensors.
Don't remember the exact problem.

If anyone know of a pH sensor suitable for continuous monitoring please tell me.
by Gavinmc42
Wed Mar 25, 2020 6:20 am
Forum: Teaching and learning resources
Topic: Lockdown home schooling
Replies: 18
Views: 625

Re: Lockdown home schooling

It could also be a good time to learn about logistic and exponential growth models. Watch reruns of "The trouble with Tribbles"? Hmm, code that as a game? I'm worried about the possible increase in violence going into "lockdown" with the kid. Was hoping there was an off the shelf solution from some...
by Gavinmc42
Wed Mar 25, 2020 5:08 am
Forum: Teaching and learning resources
Topic: Lockdown home schooling
Replies: 18
Views: 625

Lockdown home schooling

With schools, cities and countries going into "lockdown" for unknown weeks/months/years how can we use Pi's for our kids education? I am not just talking about coding but the entire school experience. Can Pi's be used remotely for all subjects? Uni's have online courses but what about Primary and Se...
by Gavinmc42
Wed Mar 25, 2020 2:46 am
Forum: Beginners
Topic: attach pH,Ec and temperature to rasp4
Replies: 4
Views: 150

Re: attach pH,Ec and temperature to rasp4

Temperature is the easy one.
Conductivity and pH are much harder.
The sensors are best used only when needed and not continuous monitoring.
Think about a robot arm dipping them in once a day etc.
by Gavinmc42
Mon Mar 23, 2020 11:43 pm
Forum: C/C++
Topic: Learning C++ on my Raspberry Pi!!
Replies: 8
Views: 407

Re: Learning C++ on my Raspberry Pi!!

Is there a way to put low count posters in isolation or quarantine them?
How many posts needed to confirm they are legit?

Humans are still better than AI at doing this.
by Gavinmc42
Mon Mar 23, 2020 11:38 pm
Forum: Advanced users
Topic: Turn RPi Camera module into USB webcam for use in Windows
Replies: 13
Views: 328

Re: Turn RPi Camera module into USB webcam for use in Windows

USB microphones work with Pikrellcam. Have not tested them with MotionEye OS. Both work with ZeroW and 3A+ over WiFi. WiFi or Ethernet IP webcam would be easier than USB OTG. Sony USB PS3 Eyecams work and have microphones, only 640x480, secondhand I have got them for $2. Old mobile phones in USB deb...
by Gavinmc42
Mon Mar 23, 2020 10:45 am
Forum: Java
Topic: Ray-cast 3D Game Engine
Replies: 18
Views: 527

Re: Ray-cast 3D Game Engine

Much better, less errors but, I don't know Java enough yet to get it to run. Oh, and you missed the red_brick file. Make a blue set and Wolfenstein is closer :D I need to think about more about the left/right sideslips movements. Still cannot find a nice simple Java game engine that works on Pi's. B...
by Gavinmc42
Mon Mar 23, 2020 3:19 am
Forum: C/C++
Topic: Learning C++ on my Raspberry Pi!!
Replies: 8
Views: 407

Re: Learning C++ on my Raspberry Pi!!

Using Code:blocks removes some of the pain of doing C++ ;)
by Gavinmc42
Mon Mar 23, 2020 12:27 am
Forum: Java
Topic: Ray-cast 3D Game Engine
Replies: 18
Views: 527

Re: Ray-cast 3D Game Engine

Wrong code for Screen.java. What do you mean? Screen.java has the Texture class code in it. I'm renewing my Java skills, was using it on PC's before Pi's came out, then moved to Python on Pi's. Tried to install libGDX, it looks like a cool lib for java gaming, but dependencies killed the install. I...
by Gavinmc42
Sun Mar 22, 2020 5:46 am
Forum: Java
Topic: Ray-cast 3D Game Engine
Replies: 18
Views: 527

Re: Ray-cast 3D Game Engine

Wrong code for Screen.java. Are you going to test this on OpenJDK too? i'm trying to get upto speed with OpengL/GLES with Java. This has some Python Raymarch code, that uses the hardware. https://github.com/Blakkis/GLSL_Python. I'm relearning Processing as the Pi4 is now fast enough. But I don't thi...
by Gavinmc42
Sat Mar 21, 2020 3:09 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPi3B+ and RPi4B)
Replies: 448
Views: 115184

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPi3B+ and RPi4B)

Upgrading to 1.5.4 seems to fix some issues, 1.5.3 was getting glitchy and slow.
Have yet to test the Gentoo USB imager but the new Raspberry PI imager worked on Windows, no need for Etcher now.
by Gavinmc42
Sat Mar 21, 2020 1:13 am
Forum: General discussion
Topic: Advice on Quad-Steer Robot Development
Replies: 3
Views: 123

Re: Advice on Quad-Steer Robot Development

What language would be used to code this? Python is a good place to start. Any computer language should work, human input is slow. You are only working in a 2D vector space. Simple trig maths would be fine? To make things smooth then acceleration control becomes important. Using a game library give...
by Gavinmc42
Fri Mar 20, 2020 7:46 am
Forum: General discussion
Topic: Advice on Quad-Steer Robot Development
Replies: 3
Views: 123

Re: Advice on Quad-Steer Robot Development

Use three rotocaster wheels. Mecanum wheels is another option too. Four wheels, unless you have suspension and flat surface, can slip. Simulation can only do so much, the real world is messy. Once you start playing with the real stuff it is easier to understand it. You can start with a smaller versi...
by Gavinmc42
Tue Mar 17, 2020 2:36 am
Forum: Automation, sensing and robotics
Topic: Air Pressure Sensor ?
Replies: 11
Views: 834

Re: Air Pressure Sensor ?

Most pressure sensors are analog so you need an ADC.
I use i2c ADCs or a micro controller with i2c and ADC.

I use NXP with the hose fittings, nothing fancy.
by Gavinmc42
Mon Mar 16, 2020 2:35 am
Forum: Off topic discussion
Topic: Proposal : include capacitors in a new PSU model to stop the risk of data corruption on power outage
Replies: 24
Views: 1694

Re: Proposal : include capacitors in a new PSU model to stop the risk of data corruption on power outage

For years I have been running PiCore based Pi's 24/7 logging data every minute. They can run for hundreds of days before power out. They come back up again without issue as PiCore runs from ram, only reading from SD. I looked at doing a PSU but too much work for the reward, none of the Pi's do criti...

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