LED GLOBEPersistence of Vision

R.M. Chanaka Prabath KarunarathnaScience & Technology Degree ProgramMechatronics

Introduction

• It is some kind of eye cheating. If some one cango faster than light people can't see it. like thatrotation speed and delay will create a LEDglobe.

• It simple design easy to understand any one….

My scope…

Components

• 1 - 16F877A Microcontroller

• 32 - Blue color LED

• 32 - 330 ohms resistors

• 1 - 10k ohms resistor

• 2 - 22pf capacitor

• 2 - 104pf capacitor

• 2 - 47uf capacitor

• 1 - 20Mhz crystal

• 1 - Push button

• 1 - LM7805

• Connecting wire &

• Lead wire

You can easily find these components

Microcontroller

• It can use 16F877A microcontroller or any other microcontroller.

How to give power to it...• It can use LM7805 voltage regulator to give a

power to this circuit.

• It gives exact 5v to the circuit.

• To smooth that voltage, can use 104pf and 47fcapacitors. Then it gives a smooth exact 5v to thecircuit.

LED

• Here used Blue color Light emitted diode (LED).

• As you wish you can use any color of LED.

• If you like you can use RGB led it will complex.

Circuit designing

• You can use PCB wizard Proteus or any kind of PCBdrawing software to design a circuit.

Structure Design

• Here used some PVC pipe to create anArc. Else some thing can have an Arcshape.

• Also important to have a good strongand heavy basement.

Coding

• It was used Pic C compiler to code or you can useany other compiler.

• 1st you have to create a sketch of world map andhave to divide it into columns and rows. In here itused 32 rows and 60 columns.

• Then it have to enter to excel sheet it is easy tofurther coding.

Cont.…

• After finishing all coding part Itshould have upload code to theMicrocontroller there for we have touse pic kit 2 programmer to programmicrocontroller.

• After finishing coding and hardwarepart you have to fix it properly andgive 6-15 voltage to work it properly.