Digital Dice Project
This
digital dice project is an interesting project that will display in
random the number from 1 to 9 on the 7 segment display. This is an
alternative device that can be used to replace the traditional dice when
you are playing games such as snake ladder and monopoly.
The
generation of clock is done by using a 555 timer which is connected in
the astable mode at a frequency of approximately 50 Hz. The 555 timer is
the most commonly used integrated circuit in many projects and it is a
good idea to get used to this device as soon as you can. On top of that,
the cost of this IC is reasonably cheap compared to other ICs.
This
clock signal is fed into the decade counter which outputs are connected
to 4 bit binary adder which provides a binary output equivalent to
binary input + 1. The outputs are then connected to a BCD to 7 Segment
Decoder which is used to drive a common anode 7 segment display.
As
shown in the schematic above, when push button PB is pressed, a square
output will be generated from the 555 timer which gives a frequency of
approximately 50 Hz to the 7490 decade counter IC. The frequency of the
astable 555 timer is calculated by using the standard formula of the
timer.
f = 1.44/[(1K + 2*1K)(0.01uF)] = 48 Hz.
The
output from the 555 timer is then connected to the input of U1 7490
decade counter. When the decade counter reach the count of 9, the
outputs of QA and QD will go to logic "1" and the counter is reset. The
7447 BCD to 7 segment decoder is used to drive the 7 segment common
anode display.
Parts List
