Please !!! Please !!! Please !!!

[Wifilee]

How to use counters to control 2 LEDs blink 5 seconds and 3 seconds respectively ? What kind of counter should i use ? synchronous counter ?asynchronous counter ? or other type of counter ?

PLEASE　give me some information ..thank you

 

[MikeMl]

So you want two alternating LEDs, where #1 is on for 5 sec while #2 is off; and then #1 is off while #2 is on for 3 sec? (Wig-Wag)?

If so, I would use a 555 timer with a 5/3 duty cycle.

How accurate must the time be?

What supply voltage?

How much current do the LEDs require?

 

[aljamri]

Or for more accurate timing, but more cost, use any small micro-controller such as 12F629.

 

[Wifilee]

So you want two alternating LEDs, where #1 is on for 5 sec while #2 is off; and then #1 is off while #2 is on for 3 sec? (Wig-Wag)?

If so, I would use a 555 timer with a 5/3 duty cycle.

How accurate must the time be?

What supply voltage?

How much current do the LEDs require?

actually my question is required the 5sec LED is represent flashing light ,3sec LED is represent warning bell, the 2 LED will be turned on when the train enters either from area 1 or area 3; and turn off when a train leaves the intersection. The flashing light and warning bell will turn on for 5sec and 3sec respectively when the train is in area 1 or area 3. Three signals P1,P2,P3 are generated when a train is in area 1 ,2 and 3 respectively.

i already know the 3 signals P1,P2,P3 is want to use flip-flop to control it , but i donno how to use counter to control the 2 LEDs blink 5 and 3 secs.

Question is required must use counters to keep track of time for the flashing light and warning bell signals.Use switches to simulate the presence of train in respective area.

 

[blueroomelectronics]

Homework assignment?

 

[Wifilee]

Homework assignment?

yup,i not going to know the answer.i just wan to know which counter suitable be use and where can get some information.