# Sequential Circuit for a Coin Collection Machine

#### Dewy

Joined Oct 27, 2022
10
A coin collection machine is to be designed to facilitate the collection of old Jamaican coins. The denominations are 5 cent, 10 cent, 20 cents and 25 cents. In the initial phase, the machine is only allowed to accept a total of 30 cents. Once the total is reached the machine displays the total and resets, allowing the user to continue the deposit if they so wish. If the total is not reached, the coins will be refunded. The plan is to use a sequential circuit for this circuitry. As computer science students, you and your team is being asked to design a prototype for this machine.

#### crutschow

Joined Mar 14, 2008
34,697
Is there a question there?

This is Homework Help not Homework Do, so we will help you with the project, but you need to show us your best effort.

#### Dewy

Joined Oct 27, 2022
10
Noted will be back in a few days

#### RBR1317

Joined Nov 13, 2010
715
to facilitate the collection of old Jamaican coins
Are there any actual coins involved here? If not, how will you simulate the deposit of different coin denominations?

#### WBahn

Joined Mar 31, 2012
30,250
So, what is supposed to happen if the first coin is 20 cents and the second coin is 25 cents?

What determines that the total has not been reached? What if the person puts in 10 cents, then quickly puts in 10 more cents, then waits several minutes and puts in 10 more cents. Was the total reached or not?

#### Dewy

Joined Oct 27, 2022
10
So, what is supposed to happen if the first coin is 20 cents and the second coin is 25 cents?

What determines that the total has not been reached? What if the person puts in 10 cents, then quickly puts in 10 more cents, then waits several minutes and puts in 10 more cents. Was the total reached or not?
The user should be refunded and the machine reset back to 0 as the coin machine should only be able to accept a total of 30 coins

#### Dewy

Joined Oct 27, 2022
10
Update my lecture changed the project so we are no longer doing this assignment. Question how do delete this post?

#### WBahn

Joined Mar 31, 2012
30,250
Update my lecture changed the project so we are no longer doing this assignment. Question how do delete this post?
No need. Like most forums, this site is archival in nature, so threads and posts stay.

#### Jerry-Hat-Trick

Joined Aug 31, 2022
583
we are no longer doing this assignment.
That's a shame, because it's quite a nice problem. Since all coins are a multiple of five maybe a decade counter would count 1 for 5 cents, 2 for 10 cents and so on. Getting to 6 would confirm the correct 30 cent total. Coins down the shute could pass opto interrupters to trigger counts but this is made harder because the larger coins would typically be made to fall away from the shute sooner - mechanically resolved by diverting coins to a parallel shute which incorporates the opto interrupters so the larger coins travel further.