![8051 7 seg 0 99 transistor](https://kumkoniak.com/74.jpg)
![8051 7 seg 0 99 transistor 8051 7 seg 0 99 transistor](https://i.ebayimg.com/images/g/RQQAAOSwvPZbPvHj/s-l640.jpg)
The chip also decodes these counted values of 0 to 9 and lights up the 7 segment accordingly. This cycle repeats itself with the incoming clock signal. The IC counts from 0 to 9 with each individual clock pulse and resets back to 0 once it hits 9.
![8051 7 seg 0 99 transistor 8051 7 seg 0 99 transistor](https://hackster.imgix.net/uploads/attachments/397798/coverpushbutton_oZitIhT1tj.png)
IC 4026 is a 7 segment decoder which takes clock signal input. A button is placed in way of this signal which is feed to the IC 4026 when button is pressed. You should keep the frequency output high so that the user will cannot judge the number sequence by any means. The formula to determine the output frequency is f = 1.44 / ( R2 + 2R1 ) C1 which gives a square wave of frequency 480hz as output. The frequency of this square wave depends upon the value of R1,R2 and C1.
![8051 7 seg 0 99 transistor 8051 7 seg 0 99 transistor](http://www.cs.ucr.edu/~ehwang/courses/cs120b/01spring/labs/seg.gif)
In this circuit 555 timer is wired as astable multivibrator where it generates square waves to feed the IC 4026. PARTS USED:ĥ) Capacitors – 1uF WORKING OF RANDOM NUMBER GENERATOR CIRCUIT: When the button is pressed the circuit will increment the sequence at high speed and upon the release of this button you will have your random number. The number count goes from 0 to 9, with few modifications this circuit can be built to count from 0 to 99. In this circuit the user is given a push button SW1 where it needs to be pressed for the number sequence to start. The circuit is based on AT89S51 microcontroller, two seven segment LED. The circuit itself is very simple and may not find any applications in serious embedded projects and this article is just an illustration.
![8051 7 seg 0 99 transistor 8051 7 seg 0 99 transistor](https://www.auselectronicsdirect.com.au/assets/alt_1/TA0179.jpg)
It’s quite simple and easy to build more than that it is cost effective. A random number generator using 8051 that displays a random number between 0 & 99 is shown in this article. While most of the number generators are based on MCU, I thought to build it only using a 555 timer and IC 4026 along with a common cathode 7 segment display. What I mean by this is that I can have my sketch run with all digits full brightness displaying 8s no problem, but if anywhere in the loop I have a variable that I increment up (say by incrementing up 1 per loop), and change nothing else, the display will go from 100% brightness, to 20% (at best).Random number generators are fun circuits that has applications in games, lottery and so on. Getting the right segments on has been a breeze, but I'm finding that if I have any kind of counting logic, the displays dim to about 20%. I've the wired my duemilanove with the a-dp pins on the 13-6, and the transistors on 5-2. I didn't have any multiplexers left but have instead wired it up as per this diagram: I've got project that needed to have some (4) digits display, and had plenty of 7 seg.
![8051 7 seg 0 99 transistor](https://kumkoniak.com/74.jpg)