This is my first post Related to Projects and today i will describe βPropeller Displayβ project. Me and my friend Rushi, we both made βPropeller Displayβ project during our under-graduation. Below is the photo of the project.
Project uses Microchip PIC16F84A Microcontroller. Below is the brief specification for same.
18-Pin, 8-bit microcontroller
Operating Speed β 20MHz max.
1024 words of program memory (word length β 14 bits)
68 bytes of Data RAM
68 bytes of Data EEPROM
14-bit wide instruction words
8-bit wide data bytes
15 special purpose registers
Four interrupt sources: Ext. RB0/INT pin, TMR0 overflow, PORTB<7:4> interrupt-on-change, Data EEPROM write complete
The principle of this project is perception of Vision(POV). Quating from Wikipedia,
βPersistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina.β
Β From the definition we can understand that our retina retains the view of past image for approximatelyΒ 1/125 sec = 0.008 sec. Lets, consider a example of torch, if one project the light-spot on wall, further he moves the light-spot circle back and forth horizontally and gradually increases the speed. Then at a time, eye of viewer can not differentiate the light-spot circle and it is viewed as one straight horizontal line of light instead of circle.Same idea applies here. In propeller display, continuous projection of LEDβs patterns (Some LEDs are ON and others are OFF) at specific location with rotating entity, gives visual appearance as steady patterns.
Below is the Schematic of project. We have used Jon stanleyβs propeller clock as Reference design.
Components:-
Microchip PIC16F84A
Β Β Β Β Β 1
10K ohm resister
Β Β Β Β Β 5
120 ohm resister
Β Β Β Β Β 7
4 MHz crystal oscillator
Β Β Β Β Β 1
220 Β΅F capacitor
Β Β Β Β Β 1
3 mm yellow LED
Β Β Β Β Β 7
On/Off Control switch
Β Β Β Β Β 1
DC motor
Β Β Β Β Β 1
Requirements:-
9V battery to power circuit on breadboard (which will be converted into 5V)
I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.
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