I want to create my controller, with a base of CPU Atmega328P (Use for Arduino UNO).
I had a few questions:
Power Capacitors. My circuit capacitors on the power supply (smd capacitors, 4 normal, 1 polar):
Is this combination correct? Or should I change the capacitance the number of capacitors?
Ferrite interference protection. I learned Atmel tips on circuit board design with their controllers. There it was stated about the use of ferrite, as protection against interference:
Will it be suitable if I put such a thing on the + 5V line? Or does it not do any good?
Antistatic protection. Should I use a diode for this?
It makes no sense to assemble the parts of an Arduino.
Certainly, the UNO is not appropriate for a practical design. If you do not require USB connectivity, then a Pro Mini is what you want, all the necessary parts ready-assembled for your use. If you are using your own custom PCB, you just mount it as a "daughter-board". You probably do not need the regulator and the pilot LED is generally either unnecessary or even a nuisance; these can simply be removed.
If you have a concern about RF radiation you can add a ferrite choke, but the Pro Mini as supplied will probably be as good or better in this regard than any other design.
Each supply pin of each logic chip should have a decoupling capacitor right next to it, the 0.1uF
ceramic sort. They need to be close to the chip to be fully effective. A single electrolytic bulk
decoupling capacitor can serve the entire board and its placing isn't critical as its not high speed
like the ceramic decoupling caps.
Use a ground plane.
Ferrite beads only useful if the 5V supply is badly noisy - if direct from a 5V regulator there no
need.
Anti-static protection is already on the chip. You can further protect the pins against over/under
voltage using schottky diodes to the supply rails. Two diodes per pin. This sort of protection
is commonly done commercially for signals that come from off the board and thus may be
carrying unknown EMI and spikes. Adding series resistance is a simpler way to protect, although
how much resistance can be afforded depends on the signal and its direction.
