I want to try LED driving with 18F PIC.

Today ive done the power supply and blink LED using the latest MPLABX 3.05 on a Vista laptop better say whats left of it (removed the broken screen).

Its a small lithium cell from electronic cigarette charging via USB.
I use a dropper diode to stay below 4.2v but pretty quickly I end up with 2.8 volts.

The PIC can be flashed using the battery supply, and works in HS mode with a 22uH coil.

The LED still blinks after some hours!

I want to use 12 RGB LEDs and MOSFETs for the rails. Guess at the low voltage average LED current is just a few mA.

Ive tried a smaller 20pin 16f716 but its not powerful enough and doesnt have much flash for instance to change brightness as well.

Probably I will use a 40pin PIC for a PCB or TQFP44.
Or just for RGB fading/programming, and use the 28pin IC.

I like the idea using a lithium battery and yes I actually have a lot of 3.3v LDO ICs.

Max. spec. for the IC is 4.0v
I dont know capacity of the lithium cell but they are pretty worn out from the ecigarette usage.

Connecting and flashing the PIC was pretty much hassle free worked instantly.