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Persistence of vision refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. The illusion has also been described as “retinal persistence”,persistence of impressions” or simply “persistence” and other variations.
The working of Arduino POV is based on the principle of persistence of vision. The human brain stores the visual for atleast tp sec . So any change within tp seconds gets unnoticed.
Let us consider an example of displaying letter H.
Initially all the LEDs of 1st position are switched ON. Within tp sec one LED of 2nd positions is made ON. Again within tp sec, all the LEDs of 3rd position are ON. Thus H is displayed.
Now for displaying 2nd letter after H, after time greater than tp sec, display the letter in a similar way as H is displayed, by making required LEDs high.
This project is made of 2 parts:
PART A (without bluetooth)
PART B (with bluetooth)
Hardware requirements:
Arduino Nano
Leds ( 5 nos)
resistors (220 ohms and 10 k ohms)
Hall effect Sensor ( 44e)
HC-05 bluetooth module
30cm ruler
Table fan/ motor
mobile battery/ Lipo battery (3.7v/5v)
General purpose PCB
male and female burg pins
soldering gun and soldering lead
magnet and tape.
Software Requirements:
Arduino IDE
Bluetooth Terminal Application on smartphone.”

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