Project overview
the goal of the project is to create a sixty second timer that resets to zero every sixty seconds and can be turned off a a single flip of a switch.
Circuit
this project is very similar to the deli counter project but it continuously counts and resets at the target time instead of pausing. this is different from other projects by using different counters and different ways we have to wire the components.
Conclusions
in a synchronous circuit the flip flops are all connected to the same clock to make it faster with no delay and no ripple effect. the ls163 functions only as an up counter. The 163 displays the number detected then resets on the transition. The 193 can function as an up or down counter and it resets on the load detected so the next number in the count desired must be detected. first I took a previously made jk flip flop counter and re wired it to start at zero and count to 5. Then I pasted a previously made 163 counter and rewired it to count to nine the reset and repeat. Then I made a logic system to detect when the ones counter resets to zero and then the logic will clock the tens count. I had to do this because if I took the clr signal from the 163 it would change the tens counter before the ones turned to zero. when the counter reaches sixty before it is shown on the display it is detected and then the tens rests in sync with the ones counter. The reset switch was connected to power and ground to reset the 163. This signal needed to go through a nand gate along with the clr signal from the flip flop detect gate. after the nand gate it goes through a inverter to reset the flip flops whenever the switch is flipped and when the signal is detected by the detect gate. yes my design was different from my classmates by how the displays were cleared when it hit sixty.