For straight on/off behaviour, a 555, a cap and a few resistors will fit the bill. For fading, on the other hand, you will need the PWM capabilities of a uC. An arduino is overkill for that; an ATTiny85 will do, like it was suggested on post #2.
For straight on/off behaviour, a 555, a cap and a few resistors will fit the bill. For fading, on the other hand, you will need the PWM capabilities of a uC. An arduino is overkill for that; an ATTiny85 will do, like it was suggested on post #2.