So I know The Atmega328 can handle voltages around 1.8-5.5v I believe (with the Clock speed changing at each one). So I had a couple of questions:
1. Is this clock speed change automatic? or do you need to set something in the chip.
2. Is there a voltage that the Atmega will just in general run better at (Maybe thats a silly question ha).
3. I've seen TONS of schematics for 5v power supplies (With various cap sizes/etc...) i'd plan on using a LM7805 and some batteries just for a "test" power supply circuit. (Im still an Electronics noob so Im still researching what battery setup is really "best" for long term use)...but is there a certain schematic thats SUPER safe and just "best"? or is just sticking with a couple of 10uf and 100uf caps the best way to go? (I've seen some that have even 3 or more Capacitors, is that really necessary?) Or should some sort of protection circuits be thrown in?