what would be the best for my different projects i wanna try to make:
1) Turn Light(LEDs /LED strips) on/off via Smartphone or Computer(LAN/WLan)
2) Play music from Smartphone(with WLan) where the Signal Revceiver(Rasp Pi/ or µC) plays the music on my SoundSystem
3)Connected Camera on one the Boards(PI/µC) which sends mi video signals to my PC to see whats going on
which one can handle with these tasks?
The thing about the Raspberry Pi is it is capable of running versions of Linux. Rasbian (the current recommended Linux distribution for beginners) actually has remote access set up in the default configuration. I was able to control my Raspberry Pi from my Android tablet over Wi-Fi without having to write any firmware or purchase any extra hardware (well I did need to get a 5 v 1A power supply for the Raspberry Pi but everything else I had already for headless operation and I already had an android tablet and a wireless router for it)!
So the Raspberry Pi can easily handle remote access from a phone phone, tablet and/or PC.
For the other side of project 1) the raspberry pi does have some GPIO but given the raspberry pi still has long lead times for delivery and it sounds like kernel support for the GPIO is coming later for now I am sidestepping using the GPIO. Instead I am connecting a PIC to an inexpensive ftdi board and connecting that to the USB port. The kernel is setup with a virtual com port driver and recognizes my ftdi board by default.
2) Playing sound from the Raspberry Pi is not something I have tried but it does have a sound out jack. I have found I can transfer files from an Android to the raspberry pi using ES File Explorer File Manager (and sFTP). The RPi command line interface is available on an Android with ConnectBot (and ssh) so I would imagine one should be able to play a sound file using the CLI. The thing about the Raspberry Pi is the hardware is included and software is free and easy to install. For an Arduino you would have to purchase the necessary shields and write a program for the remote access. Just the ethernet shield by itself costs more than a Raspberry Pi. On the fly decompression and playback of MP3 files is not simple. An MP3 shield for the Arduino that would handle the details costs $40 from sparkfun (again that shield is more costly than the Raspberry Pi). The raspberry pi is an extremely versatile general purpose computer with a lot of hardware included. Anduino is a Microcontroller board with a lot of useful shields available that can be added on.
3) I don't think this is so easy (at the moment). Plenty of people are taking snapshots with a web cam and the Raspberry Pi. Getting it to stream video apparently does not work with included drivers as of August 4th but perhaps that will change with updates. This is not something I have attempted myself yet. see http://sirlagz.net/?p=493
Also a HD camera for the Raspberry Pi is in the works. don't know details yet.
I doubt is is going to work on an Arduino ever. see http://www.arduino.cc/cgi-bin/yabb2/YaB ... 1226951266