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A microcontroller like an Arduino or Axon, or PIC, or... can, well, do a lot more. Not as much as the Raspberry Pi, but they are essentially small 8 bit computers on a chip.
Thank you jkerns and Soeren for your answers, I now get the difference. What I understand is I could have opted for an Arduino board instead of a Raspberry PI and I would have saved myself the cost of a servo controller, but since I chose Raspberry PI (mainly for the Linux Platform I'm familiar with) I have to interface my servos with something.That being said, since I'll eventually want to add some sensors, programatically controlled LEDs, maybe an LCD screen, should I still go with a microcontroller board instead of a maybe more simple but more limited servo controller ? I think I saw several devices suited for use on an i2c bus (that I was planning to use on the Raspberry PI) AND also a ton of them advertised as compatible with Arduino... I'd like to have your opinion about the best way to go ?
What would be the advantages of this board comparatively to the other two discussed previously ?
(I see the price is somewhat higher, it's back order til mid-september and comes as a kit so I 'll have to assemble it. If you guys consider this option a better value I'll listen to those who know, but I'd like to understand what I'm getting into ;-)
Also, is there a big difference in the learning curve in order to achieve some percievable results ? (From where I stand I understand I have tons of stuff to learn anyways and I realize tinkering and fine tuning all the aspects of this project will take time, just dont want to make it harder than necessary ;-)