Introduction: Cheap 16F84 POV Message - AirText

This is a post of LEDs project. The project is called POV (Persistence Of Vision). If you are not familiar with this concept, it works as an LED matrix display.

The difference is that POV display consists of one column of LEDs only and is mechanically scanned through space to give the vision of a 2D LED Matrix Display.

Many projects are built in rotating ( circular motion ) or in oscillating layout ( moving left and right) .

I 've seen this project "AirText " based on the Sun Microsystems Sun Spot , then I wanted to make a similar yet more simple project.


There are many Microcontroller projects based on the POV concept. But i think this is the simplest circuit that can do the job with minimum hardware.

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Step 1: Circuit

Components:

Small piece of veroboard get it from Amazon or from eBay Here

16F84A get it from Amazon or from eBay Here


8 LEDs OF any color you prefer get it from Amazon or from eBay Here


8Mhz Crystal get it from Amazon or from eBay Here


9v Battery Connector get it from Amazon or from eBay Here


9v Battery get it from Amazon or from eBay Here


Small wires


Tools:

Soldering iron get it from Amazon or from eBay Here

Step 2: Software

Copy the files of the Proteus ISIS design

Compile the C file .

Load the Hex file into the Microcontroller using the 16F84 JDM Programmer. In another instructable of mine

https://www.instructables.com/id/Easy-16F84-Microcontroller-Programmer-JDM/



You can change the program as you wish to change the drawn text .

Step 3: Run Your AirText

The only drawback with this circuit is that it has no sensor for direction of motion. The
Sun Microsystems Sun Spot has a built in motion sensor called accelerometer. Which senses the amplitude and direction of acceleration. So when the module is moved in one direction it draws the scanned characters according to this direction.

But with this simple circuit using PIC16F84, the characters are drawn in one direction independently of the circuit direction of motion.


Here is the project on my blog:

http://embedded-egypt.blogspot.com/2009/12/16f84-pov-airtext.html

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Comments

author
ahmedebeed555 made it! (author)2014-09-23

The library <include pic.h> is included in the HiTech PIC software.

This is C compiler I used.

Thank you.

author
diegoeduardoa2 made it! (author)2014-09-22

APOLOGIZE MY ENGLISH IS NOT VERY GOOD NO WHERE TO DOWNLOAD THE LIBRARY <INCLUDE pic.h> OR ANY URL per ORDER TO DOWNLOAD AND TRY'd really appreciate it

author
diegoeduardoa2 made it! (author)2014-09-19

amigo la libreria que utilizaste de donde lo descargo gracias

author
ahmedebeed555 made it! (author)ahmedebeed5552014-09-19

شكرا جزيلا

author
diegoeduardoa2 made it! (author)diegoeduardoa22014-09-22

كصديق لا تتحول تسأل الى اين للافراج عن المكتبة <تضمين pic.h>

author
diegoeduardoa2 made it! (author)diegoeduardoa22014-09-22

SORRY MY IGNORANCE BUT NOT EVEN UNDERSTAND HOW TO OPERATE BECAUSE I DO NOT HAVE THE LIBRARY <INCLUDE pic.h>

IF I APPRECIATE YOU SO MUCH give THANKS TO OPERATE FROM FRIEND AND GREETINGS FROM PARAGUAY

author
diegoeduardoa2 made it! (author)diegoeduardoa22014-09-22

APOLOGIES MY ENGLISH IS NOT VERY GOOD

author
oabzhanov made it! (author)2014-03-28

Give quartz circuit connection

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Bio: Embedded Systems Engineer. Love to travel , run , design useful stuff and grow green plants. I joined instructables.com on 2008 and my first instructable was ... More »
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