Logic gates / counter help/ :{
Hey guys,
I Really hope you could help / advice me with my project.
My project is to create a car that will pass thru 9 stations overhead bridges. The car has a LDR on the top. The car will start at
station 1 and pass thru till station 9. When the car passes thru each station, it will count up till 9 (getting trigger signal from
the LDR). Once it reaches station 9, it will send a signal to the motor driver circuit (See picture (Pin J8 connected to a relay))
which will cause the car to reverse and it will need to countdown as goes back to station 1.
I have the following circuit’s boards:
LDR Circuit
http://farm7.static.flickr.com/6229/627 ... 4f15be.jpg
Motor Driver & Power supply (9V to 5V)
http://farm7.static.flickr.com/6112/627 ... fa1b_b.jpg
UP/DOWN Counter (74LS193) to BCD (74LS47) to 7 Seg display
http://farm7.static.flickr.com/6232/627 ... 0d39_b.jpg
Here is the overview picture of the whole circuit:
http://farm7.static.flickr.com/6114/627 ... a90b_b.jpg
[u]The above circuits have been given, i will need to design a "c0unting limiting circuit" which will act as the brain of the car.[/u]
The components I can use are:
74LS32 OR gate
74LS08 AND gate
74LS04 NOT gate
74LS02 NOR gate
74LS00 NAND gate
74LS74 D flip flop
2N3904 NPN transistor
I hope and appreciate you are able to help as i really lost. Thanks alot!!!