₦airaland Forum

scholes0:
Shioor.. 50% foreigners ko, 100% Aliens ni.
those figures for the SW you see there is nothing less than 85% Yoruba. And Lagos is the ony reason it is even that low. All other tribes have the other 15%
You better go think of how to save ur region from massive brain and labour drain

where is Lalasticlala sef....

e pain am....

totit:
Mtchew.
We are talking about purchasing power this one is yapping about population.
And so what,so what happened to ogun state, Oyo that beat the rest of SE states?
You should ask yourself this question, if SE as a whole couldn't beat SW as a whole what make you think that the few populace of Ibos in SW would have any significance after all?

Use you head nah

It's simpl as a ABC

The guy i quoted was talking about population, same as you. But then i don't expect SE to beat SW when the whole Nigeria (Majorly Igbos) are in Lagos and Ogun State. SW is only bearing the glory of immigrants.

OmoIgala:
The South East is not as populated as most people think at all..... 10.27% of active phone lines?..... lol haba.
Anyway... wetin I know... goes back to chewing Akidi and Okpa

Yes, a hardworking man does not stay at home. His statistics counts at his place of work.

Stop beating your chest over statistical figures that constitutes over 50% of foreigners.

Everyone knows that for every 1 Yoruba man in SE, there are 10,000 Igbo men in SW.

Respect to all hardworking Igbos all over the world.

pictures of him dressing the hair or adonbilivit

Which of these marvels you the most?

I'm sorry for my slow pace .... i will be back soon to edit and update this space.
More comments and questions....

Savotech:
Good work bro, but why are u using 4017 it is only good for just 10 columns. If we need more than that we have to cascade the 4017 which u and i know thats its not easy to do.

I dont mean to disrupt your tutorial but i think using shift register will be easier than a decade counter. Shift register like 74hc164, 4094, 74hc595 etc

Thanks for the comment bro.
Yes, you are right. 4017 requires additional AND gate to cascade but you can tweak it in your software program. For example if i want to use three 4017, i will have to tap from 3 different pins of my uC to serve as individual clock source, then i can take care of the cascading myself from the program.
I actually started with 4017. I have studied the shift register (74HC595) in the past to design a LED matrix display but at the end i still find my 4017 easier & handy for me (Maybe cos i started with it).
I noticed that with 4017, i am only concerned with my clock pulses, while with 74HC595, from what i studied, ii will have to be concerned about Clock and data shifting (enlighten me if i'm wrong).
But one advantage of 4017 is that it is readily available in the market.

In this design, a decade counter is used as a shift register to scan through the columns at every clock signal.
Since the output of a decade counter is positive (i.e. ONE) , we are going to need a negative (i.e. ZERO) as our data bit sent by the microcontroller in order to display our desired character.

Technically, we can say our Decade counter sources current, while our uC sinks current - as indicated with the arrows.

Displaying a still character

We are going to learn how to display a still character first of all in order to get the concept of how a dot matrix display works.

Let's take an example, where we have to display letter 'D'. Doing so, it means we have to send five consecutive clock pulses to the clock input of 4017 decade counter. Each clock pulse is accompanied with these corresponding data bit:
11000001, 10111110, 10111110, 10111110, 10000000

What i mean here is that:
4017 clock pusle _______________ Corresponding uC data bits
1st________________________________ 11000001
2nd________________________________10111110
3rd ________________________________10111110
4th ________________________________10111110
5th ________________________________10000000


Note that my clock pulse begins from right to left while i start reading my data bits from bottom to top (just my preferred convention).
Note also that from the diagram below that the first pin(starting from bottom to top) of the uC is not connected to anywhere. Remember we have 7 rows, whereas our uC is an 8bit device, in essence, we have to always read that pin as 1 to complete our data bit eight!

Please questions are entertained.

How a LED matrix display works

In the picture below, the rows are wired negative (indicated with blue colour) and columns are positive (red colour).

This means that all negative pin(shorter leg) of LEDs in a particular row are wired together same as all positive pin in each column as indicated in the picture below.

Now, if I connect a single column to say positive 3V and a single row to negative (0v), then the LED in place of the intersection of the corresponding row and column will glow (not so?).

Now , if we select a single column(means a +ve volt at selected column) , say column 3 and multiple rows (means connect 0V to few selected rows), say row 2, 4 & 8, then the selected 2, 4 and 8 LEDs in column 3 will glow.

Now if i shift the column(means shifting the positive voltage from column 3 to column 4), and if i change the row data (i.e making row 1, 5, 7 at 0V) ,then the new data will be displayed in column 4.

Now, if i continuously shift the column and provide row data corresponding to each column, then i can display the different row data (8 bit) in different columns.

So, if one frame(i.e. 20 column shift - remember we have 5 column per page by 4pages = 20column) is completed within 1/16 th of a second (62.5millisecond) , then due to the persistence of vision of our eye, we will feel the entire columns are activated at a time, and thus we will see all the twenty 8bit data corresponding to the 20 columns , at a time.

Meaning that if a set of 8bit data represents a character, say 'D', then we will see letter 'D' in the display.

bigtt76:
Nice. I'm interested. Sitting tight.

Thanks for showing interest
More comments like this will motivate me to go on.

Tools and Components needed
Assuming you have other basic electronic kit, these are the components required:
Hardwares
1. 5x7 LED Dot matix board - 4pcs
2. 4017 IC - 3pcs
3. Microcontroller (PIC 16F877A) - 1pcs
4. 7805 IC - 1pcs
5. 1N4001 diode - 4pcs
6. 4.7k resistor
7. 10MHz Crystal Oscillator -1pcs
8. Vero board and/or breadboard
9. 470uF Capacitors - 2pcs
10. 230-12V step-down transformer
11. Connector (Wire).

N.B:
1. You can actually design you own LED Matrix board, unfortunately i won't be covering it in this session.
You can checkout Aliexpress for a matrix board if it happened you can't find it here in Nigeria. It will actually save you lots of time and stress.

2. A 230-9V Transformer will work as fine but in cases of PHCN low voltage, you might obtain as low as 6-7V at your transformer's secondary and when you subtract the voltage drops from two rectifying diodes, at the end you will be having about 4.8-5.8V and this is less than the Minimum Vin for our 7805 voltage regulating IC, hence resulting to about 3V supply to power our uC.

Software Programs
1. ISIS Professional - for simulating your design on PC
2. MikroC - for writing C program for the uC

INTRODUCTION
An LED dot-matrix display is a display device used to display information on machines, clocks, Bus Departure indicators and many other places requiring a simple display device of defined resolution.
It is also called a multiplexed display - meaning a kind of electronic display where the entire display or LEDs are not driven at one time
rather a set of LEDs are displayed (in most cases column-wise) one after the other. But due to the electronics and the persistence of vision combine and achieved in software, makes the viewer believe the entire display is continuously active.


In this thread, i am going to show you how to build a 7 row by 5 column by 4 page LED Dot Matrix Display.

One advantage of this design over other LED Dot matrix is that it achieves both a column and row scan.
Meaning that only a single LED is ON at
a particular point in time in the entire display. In that case, we don't need any transistor or transistor IC for any form of amplification since our LED needs about 25mV while our uC (Microcontroller) can source about that same amount of current.
But then this comes with a disadvantage that more time is required to light-up a column unlike when it was a column scan alone. The implication of this is that we could only but achieve a lesser number of pages to avoid any noticeable flickering effect.

Let's get down to business
https://upload.wikimedia.org/wikipedia/commons/5/56/Dotmatrixani.gif

thesicilian:
Hahaha...that got me cracking up!
What did you think they were going to give you - A late model Ferrari and a house on the beach?

Yes, plus a mouth -watery sum of money to start life.
Tell me you wouldn't have prefer that in lieu of a mere paper.

This thing we call certificate is just overrated. If we develop our brain and use it well, we don't need that sh!!t. You can ask Bill Gates or Dangote.

After my 5years in school, i was disappointed to be handed a mere paper that was manufactured within a span of few minutes. And i wonder how this paper compares to my 5years of suffering where the most you can get from it is being a slave to a company owned by a man who has no certificate or can't even locate where he kept his certificate.
If you earn much in such companies, it is either you have or are dedicating most of your youthful age to its growth, or it poses threat to your life or health.

And the worst part is a man who has the money can just pay his way to obtain what you have been suffering to get for years.

OP, I have laminated my certificate and i was told long ago it is not good to do so. But i dont give a damn!
Who certificate don epp? (to speak in Bill Gates, Seun Osewa and other entrepreneurs' point of view)

If we can't start having that entrepreneural spirit, we will remain stagnant in terms of development while we keep using our certificate to work as modern sophisticated slaves in all these oyibo companies.

Lemme stop here.

But Nigerians and certificate....

[img]http://media./media/l0NwsQdm1aWYWslsA/giphy.gif[/img]

Kgdavid:
the empty seats tho.... even my amateur games have more fans that this

xender:
wow..nice work 0p .see empty stadium .No fans. .

kevoh:
We no try for Abuja ooo. See scanty stadium

Mopolchi:
people no come field

I laugh una...Make dem trek come?

No guy go near that area i bet you!

IamLukas:
How many persons have U resurrected?

Just you

Is it now a crime to ressurect someone?

Me.

Mod & OP abeg next time use hyphen (i.e Bride-To-Be) so we can read better next time

Lol

Let's be honest, this award belongs to Jonah because Jonah is our next rated Grand Collar of the Order of Independence.
Fck that shiiiii!

He couldnt answer the question and keeping quiet will make him a lose, so he resorted to losing his temper on the presenter.

APC thought they won the election, not knowing they just won a ticket to their doom.
I feel like fastforwarding to 2019 cos i cant wait to laugh at their woes.

Op that is the ghost of a lizard

Did you know that the space program is busy proving that what has been called “myth” in the Bible is true? Mr. Harold Hill, President of the Curtis Engine Company in Baltimore Maryland and a consultant in the space program, relates the following development.

“I think one of the most amazing things that God has for us today happened recently to our astronauts and space scientists at GreenBelt, Maryland. They were checking the position of the sun, moon, and planets out in space where they would be 100 years and 1000 years from now. We have to know this so we won’t send a satellite, up and have it bump into something later on in its orbits. We have to lay out the orbits in terms of the life of the satellite, and where the planets will be so the whole thing will not bog down.

They ran the computer measurement back and forth over the centuries and it came to a halt. The computer stopped and put up a red signal, which meant that there was something wrong either with the information fed into it or with the results as compared to the standards. They called in the service department to check it out and they said, “What’s wrong?”

Well, they found there is a day missing in space in elapsed time. They scratched their heads and tore their hair. There was no answer.

Finally, a Christian man on the team said, “You know, one time I was in Sunday School and they talked about the sun standing still.” While they didn’t believe him, they didn’t have an answer either, so they said, “Show us.”

He got a Bible and went back to the book of Joshua where they found a pretty ridiculous statement for any one with “common sense.” There they found the Lord saying to Joshua, “Fear them not, I have delivered them into thy hand; there shall not a man of them stand before thee.”

Joshua was concerned because he was surrounded by the enemy and if darkness fell they would overpower them. So Joshua asked the Lord to make the sun stand still! That’s right — “The sun stood still and the moon stayed — and hasted not to go down about a whole day!” (Joshua 10:12-13)

The astronauts and scientists said, “There is the missing day!” They checked the computers going back into the time it was written and found it was close but not close enough. The elapsed time that was missing back in Joshua’s day was 23 hours and 20 minutes — not a whole day.

They read the Bible and there it was “about (approximately) a day” These little words in the Bible are important, but they were still in trouble because if you cannot account for 40 minutes you’ll still be in trouble 1,000 years from now. Forty minutes had to be found because it can be multiplied many times over in orbits.

As the Christian employee thought about it, he remembered somewhere in the Bible where it said the sun went BACKWARDS. The scientists told him he was out of his mind, but they got out the Book and read these words in 2 Kings that told of the following story:

Hezekiah, on his deathbed, was visited by the prophet Isaiah who told him that he was not going to die.

Hezekiah asked for a sign as proof. Isaiah said “Do you want the sun to go ahead 10 degrees?” Hezekiah said “It is nothing for the sun to go ahead 10 degrees, but let the shadow return backward 10 degrees.”

Isaiah spoke to the Lord and the Lord brought the shadow ten degrees BACKWARD!

Ten degrees is exactly 40 minutes! Twenty-three hours and 20 minutes in Joshua, plus 40 minutes in Second Kings make the missing day in the universe!” Isn’t it amazing?


https://www.youtube.com/watch?v=1KMd-5MVF_E

Source: http://tac3news.com/nasa-proves-the-bible-is-true-the-missing-day/

A wicked and crazy world