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I am part of a project to build a system and one of the requirements is that we must use the raspberry pi.
The issue we are having is that one raspberry pi doesn't have the processing power we need to do what we want. How can I get multiple raspberry pi to work concurrently?
edit
We are trying to use the raspberry pi to create a matrix of infra red beams to detect when people are moving through them.
The Raspberry Pi compute module has 120 GPIO pins. And enough processing power. Also on the raspberry pi forum you are more likely to find an answer.
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If I make my own vpn using raspberry pi then can anyone track me?
I have made a vpn on raspberry pi using Pivpn so can someone or the Pivpn owner see my activity online?
The question is a bit confusing and we need more information to follow up.
A VPN works by sending all your data through an encrypted tunnel to another far away server.
However if your raspberry pi is at the same location you browse the internet from (such as your home) your ISP will still be able to detect the requests you are making as they will still be made from your IP address.
More detail on the question and who you are trying to stop tracking you would be useful.
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on my raspberry, I installed "motion" (the one with daemon) for my Pi Camera. However, I set up the Motion with the port 8081. If I open it on the raspberry using localhost:8081 it works but unfortunately with a big delay/lag. Maybe if you find a solution to this would be awesome. But my main problem is that if I want to open the server on my Pc by entering 192.168.xxx.xx:8081, it won't open at all. Using the IP without the port it still works. Maybe you find a solution.
The lag you encounter on Raspberry pi is because that same raspberry is processing the video input, and now you want to add processing of showing you that stream, after all, it is raspberry, no big deal there.
The Motion config file (/etc/motion/motion.conf) haves a setting named "Stream_localhost" by default it is set to ON, make sure you change it to OFF.
If you have any other problems I believe this simple instruction will help you.
How to Make Raspberry Pi Webcam Server and Stream Live Video || Motion + Webcam + Raspberry Pi
EDIT:
After quick google searching I found out that two more settings must be set to off also
webcam_localhost off
control_localhost off
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I want to use my Raspeberry Pi to learn how to make operating systems. I know that to make one I need some assembly code for the bootloader so I can call a function in a kernel written in C. Would the ARM CPU of the Pi use the same assembly code for if I was writing an OS for a normal CPU? Would the OS development steps be similar to normal?
Yes it would be similar but as it goes with kernel development it may differ in the details like (what instructions are supported by raspberry pi3 itself).Having said that be prepared to do a lot of reading of the arm-v8 instruction set and of course operating system concepts if you have not yet.
As a general tip if you are new to kernel development start with a single cpu and once you are confident enough you can start multi core.
Also I will be pointing out few links which are extremely helpful in building operating systems for raspberry pi for beginners
https://github.com/s-matyukevich/raspberry-pi-os
https://github.com/rsta2/circle64
https://github.com/LdB-ECM/Raspberry-Pi
https://www.raspberrypi.org/forums
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I just want to know, whether I can transfer my pi projects to other pis by simply plugging the sd card into a different pi without damaging any of the projects on them.
There is no data stored on a Raspberry Pi except on the SD card. You may move your card from one Pi to another.
Well, there is data stored in the RAM, but that's no big deal. Just make sure your raspberry pi is off, to avoid corrupting your SD Card (that's happened to me several times). But other than that, it should be just fine switching out SD Cards to another pi.
Just to be safe, I would recommend using the same Raspberry Pi model (although it probably doesn't matter)
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I would like to know if I could use the raspberry pi phone as a universal remote. I am new to the raspberry pi. Would you recommend any parts for the device. If you are familiar with the pi phone them could you recommend any if blasters or batteries.
This is some hardcore serious overkill for a homebrew remote project.
you should be able to simply drive a normal IR-LED directly from one of the Digital Out lines on a raspberry pi board ( assuming that the PI phone leaves at-least one spare. ) The power consumption from something like that is a bit larger than what you would expect (therefore you would only get a few hours out of it. ) something like a ardunio would have a significantly longer battery life (and if you get creative and drop a capacitance sensor onto it to turn on and off the Touchscreen if you are holding it or not then you can have it live even longer. )
It is less than ideal due to the current draw from a IR LED, so a more suitable answer would be to run a transistor from the GPIO port and a secondary regulated power source for the LED.