RGB POV DISPLAY
RESHMA ELIZABETH MANI
SHILPA ANN ISAAC
Block diagram 6
Component description 8
System diagram 18
PERSISTENCE OF VISION ( POV )
This is a phenomenon of the eye by which an after image is thought to persist for approximately 1/25thof a second. So if someone is observing images at rate of 25 images/second, they appear to be continuous.
The way this phenomenon of persistence of vision works is based on the belief that human perception of motion (brain centered) is the result of persistence of vision (eye centered).
Example: When we rotate a fire cracker stick at high speed, we observe a continuous circle being formed .
Incurrent era in which energy is the main factor in designing all the applications, maximum and efficient use of the energy is very important.
APOV display has manyadvantages over CRT, LED and LCD display like:
To overcome the drawback oftheold processor we have decided to implement the same display atop a new and advanced microprocessor, the Arduino. This platform brings with it newer coding and a different understanding of peripherals.
ARDUINO INTERFACE BOARDS provides us with a low-cost and easy-to use technology.
The two basic parts of this project are:
1. Stationary Setup – Motor
2. RotatingSetup-Arduino,Zigbee, LED Array
It acts as a prime mover.
Helps in repeated scanning of the display.
High speed circular rotation is achieved.
Due to the high speed an illusion of vision is seen.
We are using a sewing machine’s motor.
TheArduino Mega 2560 is a microcontrollerboard isbased on the ATmega2560.
Ithas 54 digital input/output pinsout ofwhich 15 can be used as PWMoutputs.
16analoginputs can be provided.
4 hardwareserialports can be connected
The crystal oscillator frequency is 16MHz.
Provisions for USB connection and power jack.
Reset button provided.
PIN DIAGRAM OF ARDUINO ATMEGA 2560
Operating Voltage: 5V
Input Voltage : 6-20V
Digital I/O Pins : 54 (of which 15 provide PWM output)
AnalogInput Pins : 16
DC Current per I/O Pin : 40 mA
DC Current for 3.3V Pin : 50 mA
Flash memory : 256kB
SRAM : 8 KB
EEPROM : 4 KB
Clock Speed : 16 MHz
ARDUINO MEGA 2560
Zigbeeis a low-cost, low-power, wireless mesh networkstandard,targeted at wide developmentforlong battery life devices in wireless control and monitoring applications.
Zigbee devices have low latency, which further reduces average current.
Zigbeechips are typically integrated with radios andmicrocontrollers.
Datarates vary from 20 kbit/s (868 MHz band) to 250 kbit/s (2.4 GHz band).
Its main use is for wireless data transmission.
A MAX 232 IC is embedded in it to synchronisethe clock frequencies between the PC and the Arduino.
To display the patterns, we will be using RGBLED’s .
An arrangement of 8 LED’s linearly on a strong platform is setup to generate a cylindrical appearance of the display when rotated at high speed by the motor.
The aim of our project is to display an image using the principle of persistence of vision.
To do this :
A dc motor is employed to rotate the led array mounted on a strong surface.
The patterns we require are programmed using arduino software.
This program is loaded to the arduino platform by a wireless transmission from the pc using a zigbee module.
The RGB display based on the principle of persistence of vision of the human eye can be generated by the employment of arduino platform and certain other supportingequipmentssuch as dc motor andzigbee module. Here we have achieved a small depiction of persistence of vision.
Metz, Christian (1991) Film Language: A Semiotics of the Cinema, trans. MichaelTaylor. Chicago: University of Chicago Press.
Reference: http:/Evil Genious.com/motor controller
Sarik, J. ;Kymissis, I. , Lab kits using the Arduino prototypingplatform, PublicationYear: 2010 , Page(s): T3C-1-T3C-5 , IEEEconference.
Varjo, S.;Hannuksela, J.;Silven, O., Direct imaging with printedmicrolensarrays, Publication Year: 2012, Page(s): 1355 –1358 , IEEE conference.
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