Knight Rider Circuit

Today we are going to create a simple knight rider circuit in two ways. Before the coding part let’s create the circuit using proteus. If you are not much familiar with proteus and MPLAB you can view my first post on embedded system.

This is the screen shot of the circuit, when you switch on the push button knight rider circuit will start to work.

figure - 01

I am gonna program this in two ways. First let’s see the long and descriptive method of doing that.

figure - 02

If I briefly explain the things above, I have used a delay function to make a delay in between two bulbs blink and the response for the selected delay will depend on your machine processor. That means delay_ms(1000) ;will behave differently in different machines, so you can adjust it according to your requirement.

Now you may wonder what’s meant by PORTB = 0x01, that simply used to select which bulb should light up at the moment. Easier way to do this is use online binary to hexadecimal converter. (http://www.binaryhexconverter.com/binary-to-hex-converter )

We can represent above 8 bulbs in a binary representation

If you need to light up 6 th bulb, the binary representation and hexadecimal representation should look like below.

figure - 03

So inside the program we can write it as POARTB = 0x020;

This is the second and short way of doing that, Just replace your while loop by using following code,

figure - 04

Good luck!  :)