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Electronics CW2

Extracts from this document...

Introduction

Lottery Number Generator

Will Epps

2007 AS Project

The Lottery Number Generator.

Aim:

I have designed this project for a family member who is rubbish at decisions. She is a big fan of the national lotteries. But can never choose what numbers to choose for her tickets. A way to stop this, would be to create a number generator, on which she can press a button, and a random number will be shown on the screen.

Research (I):

In order to design a circuit that helps people choosing lottery number. I need to find out more about the lottery itself.

From the website http://www.national-lottery.co.uk

I have gathered some basic information on the lotteries.

The most common is called “lotto”. It consists of 6 numbers, and a ‘bonus ball’ (a seventh number). All picked at random. People with matching balls win money. The more matching numbers, the more money you win.

There are many other games, but all run off the same principle. That matching numbers win you money.

The balls range from the numbers 1 to 49. And only appear once each. The odds of matching all your numbers, are somewhere in the region of one in fifteen million.

The numbers u choose are printed onto a ticket, via a machine, then given to you. Winning numbers must be returned to a machine that registers tickets. Large sums of money are often paid in form of cheques.

So I am looking to design something that creates random numbers. To be put onto tickets.

Specification:

...read more.

Middle

7                0                1                1                1

8                1                0                0                0

9                1                0                0                1

10                0                0                0                0

11                0                0                0                1

This truth table can be used to find which pins create the correct reset.

EG’s.

Reset on 3 -

A+B = 3

Reset on 9 -

A+D = 9

………

Decoder:

image18.png

This chip Is called a 4511 BCD to 7 seg Decoder.

This chip converts the logic states of the outputs of the 4510, to a display.

This chip only powers common cathode displays, as the output pins go high.

The A, B, C, and D output pins of the 4510 are connected to the A, B, C, and D inputs of the 4511.

The pins, a, b, c, d, e, f, and g are then connected to the corresponding pins on the 7 seg display.

I have got the table below from http://www.doctronics.co.uk/4511.htm

BCD inputs

segment outputs

display

D

C

B

A

a

b

c

d

e

f

g

0

0

0

0

1

1

1

1

1

1

0

image19.png

0

0

0

1

0

1

1

0

0

0

0

image20.png

0

0

1

0

1

1

0

1

1

0

1

image21.png

0

0

1

1

1

1

1

1

0

0

1

image22.png

0

1

0

0

0

1

1

0

0

1

1

image23.png

0

1

0

1

1

0

1

1

0

1

1

image24.png

0

1

1

0

0

0

1

1

1

1

1

image08.png

0

1

1

1

1

1

1

0

0

0

0

image09.png

1

0

0

0

1

1

1

1

1

1

1

image10.png

1

0

0

1

1

1

1

0

0

1

1

image11.png

If the input goes above “1001” The output pins all go low… and the 7 seg doesn’t light.

Simple 4510 & 4511 Circuit Diagram:

image12.jpg

7 Seg Display:

image13.png

This is what will display the numbers.

...read more.

Conclusion

But shows the number 00.

Has a long battery life of over 3 hours.

Limitations and Modifications:

My circuit wasn’t perfect as the number 00 was shown. I have tried to think of ways this could be removed. But I couldn’t think of a way to do it. Unless I used PIC’s. A program could be written to remove the 00 signal. But as I have no experience in PIC program writing. I am not going to look further into this idea. Like I say I have no knowledge of PIC systems. But if I could remove the binary signal (A,B,C,D corresponding outputs) 0000 from the string of codes, the number 00 wouldn’t show. And would skip to 1000. This would show 01.

Other than that I wouldn’t change the circuit. It met all my specifications. And worked well.

Evaluation Of Final System:

Again what I said in my assessment and modifications sections. The circuit works very well. Has met all of my needs. And I can think of only one thing that could be improved. I cannot follow the modification through. As I don’t know anything about PIC programming.

image02.png

Specification:

Must generate a number and show          image16.png

Generate numbers from 1 to 49.                     image16.png

With the numbers showing faster than the human eye can see to choose them.                 image16.png

Therefore making it impossible to choose numbers.                 image16.png

Must operate from a 9V battery, as these are commonly available.        image16.png

Must consume as little power as possible, otherwise battery life will be short. So have current consumption of less than 200mA.                image16.png

Report:

Some information used from…

Ian Kemps - coursework guidelines

www.doctronics.com – chip layouts, and 4511 logic truth table.

http://www.national-lottery.co.uk

...read more.

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