A short history of the french revolution popkin ebook reader. Micro-controllers play a very important role in electronics, as they are able to perform tasks in automation, control, image processing, among others. Their usage is immense.
PIC16F628A LED Chaser. Author: Dinesh Kumar Wickramasinghe. This neat little circuit provides 8 LEDs directly driven from the PIC along with a single mode control switch. The firmware elsewhere on this page drives the LEDs with a 5 bit PWM signal providing each of the 8 LED channels with four levels of intensity; off, dim, mid, bright. The programmer is powered from the Serial port itself, so there's no need to any external power supply. But be careful this circuit will not work with the Laptop Serial port due to the weak voltages it has.
There are various families of micro-controllers, one of those is the Microchip’s PIC (Peripheral Interface Controller). PICs are very popular as they are relatively cheap and because of their characteristics, for example their low power consumption, internal oscillator and free development tools. This is an example of a very simple 40 pins PIC programmer, it only needs 3 resistors.