BasketBall Counter, Help me with the circuit .

[anirudh1994]

Hello every one my question goes like this

Design a circuit which shows basket ball score of a team using 2 seven segment displays(maximum possible number is 99). Circuit should have 3 input keys.The score should increment by 1 or 2 or 3 depending on which key is pressed.There should be an option to reset the score to 00.

Please help me since i dont have any idea in approaching this question . This is my one of my lab assignment ..

 

[Ian Rogers]

If you visit Nigel Goodwin's pic tutorials ( link in my signature ) you will find all that you need!!

 

[anirudh1994]

Sir yes but we need to do it only using breadboard and 7400 series IC's .. So that is what I want ...

 

[JimB]

but we need to do it only using breadboard and 7400 series IC's

So why did you not state that in your original request?

So, there are two parts to the problem:

1 How to detect a basket ball.
2 How to count up to 99 using 74 series ICs.

Have you given any thought to these problems yourself?

JimB

 

[crutschow]

I won't do your design but this should get you started:

You could use three decade counters connected in series (cascaded) and three BCD to 7-segment converters, ( or use a 74143 or 74144 combined counter display-driver) one for each digit to generate the score. (Here's a list of 7400 logic gates).

Advancing the score by 1 is simple as you just use that switch to clock the counter once (you need a debounce circuit for the switch).

Advancing the score by 2 or 3 is more complex. You need a circuit to clock the decade counter by 2 or 3 pulses when the respective button is pushed. For that you could use two counters set to perform just 2 and 3 counts respectively and then stopping the oscillator clock. Typically a 555 would be used for the oscillator but if you can only use 7400 ICs then you could use one of these circuits. The oscillator frequency is not critical, just fast enough to perform the count in a few ms or less. The 2 or 3 pulses from the clock also clock the decade counters to advance the score by 2 or 3. The release of the respective advance button can be used to reset the respective 2 or 3 count counter.

Resetting the score to zero is simply done by connecting the Reset inputs of the decade counters to the reset switch (this switch does not need debouncing).

 

[crutschow]

............................
1 How to detect a basket ball.
........................................

It's key entry, no need to detect the ball.

 

[anirudh1994]

Yes Sir ,no need to detect the ball .. Yeah I thought of using 2 decade counters seperately for 2 seven segment displays and some combinational logic so thatwhen even the least sig digit is 9 then we the most significant digit increases by 1

 

[JimB]

It's key entry, no need to detect the ball.

OK, failure on my part to understand.
I had this mental picture of the ball going through the hoop thingy, and thought that is what was to be counted.

JimB

 

[crutschow]

OK, failure on my part to understand.
I had this mental picture of the ball going through the hoop thingy, and thought that is what was to be counted.

Referring to it as a "hoop thingy" would lead me to think you are not a close student of the game. So even if you could detect the ball going through the hoop you still need to determine if it's 1 point (free throw), 2 points (shot inside the 3-point line), or 3 points (shot outside the 3-point line).

 

[JimB]

Referring to it as a "hoop thingy" would lead me to think you are not a close student of the game.

Very perceptive of you!

So even if you could detect the ball going through the hoop you still need to determine if it's 1 point (free throw), 2 points (shot inside the 3-point line), or 3 points (shot outside the 3-point line).

Far too complicated for a childs ball game!

JimB

 

[dr pepper]

How about a cmos 4026, its a decade counter and 7 segment decoder, if you google it I'm sure you'll find plenty of counting circuits.

Heres one:

**broken link removed**

If you configure the 555 as a monostable triggered by a pushbutton you have it sorted.
I found a schematic on engineers garage that has a similar circuit connected to a pushbutton, I dont think that circuit would work too well and the switch isnt electronically debounced.

 

[anirudh1994]

Hai dr pepper .. We need to use only 7400 series IC's only

 

[JimB]

We need to use only 7400 series IC's only

OK, so have you had a look at the 74xx series datasheets?
Have you tried to find counters in the 74xx series?

JimB

 

[dr pepper]

ok