Can someone review my first Arduino schematic please ? Basically it is Atmega328 + RFM-12B + RGB LEDs. It works fine on breadboard. I was mainly inspired by JeeNode and Arduino.
My main concerns are :
board will be powered by 3.7V Li-Po battery without any power regulator because all used components can work with input voltage 3-3.7V supplied by the battery. Is some easy way how can I implement some charging circuit which can charge the battery ? Sometime is not possible disconnect battery for charging.
I want use BC850, each for powering single channel on LEDs. Transistor is powered through 1k resistor, which should be fine.
only red channel needs a resistor, blue and green has forward voltage high enough to be powered directly.
radio is connected to same pins as ISP header used for bootstrap, I’m slightly worried if it can cause some interference, but JeeNode has it same.
On schema is Atmega168 only because I can’t find 328 in Eagle :) It will use its internal 8Mhz oscillator because external oscillator is another thing is another thing which can go wrong, I don’t need extra performance and power consumption.
edit: earlier related thread