please help with my crossroad traffic light project...

[D@rkL0rd]

can anyone make me understand the working of ic 4017...i think i have a major misconception about its working....

 

[pyromaniac4382]

http://www.doctronics.co.uk/4017.htm

This website has a good animation. Scroll down to what is a decade counter, and press play.

 

[D@rkL0rd]

The short is marked red in this picture:

you did now, but not in the picture from your previous post #15.

well i finally got the required pulse from the timer ....but now in the counter the pin 0 is not going high in the first loop it goes high int he second loop...please help

 

[Harald Kapp]

You cannot leave unused CMOS inputs floating.
Tie R (reset, active high) and EN (enable, acive low) to GND.

You can create a reset signal for startup (not too well defined but possibly useful) using the top left circuit from this page. Conect the output signal of the reset circuit to R of the 4017 (in this case, of course, do not tie R to GND).

 

[D@rkL0rd]

You cannot leave unused CMOS inputs floating.
Tie R (reset, active high) and EN (enable, acive low) to GND.

You can create a reset signal for startup (not too well defined but possibly useful) using the top left circuit from this page. Conect the output signal of the reset circuit to R of the 4017 (in this case, of course, do not tie R to GND).

sorry i uplaoded the wrong photo this is the one i am talking about...

 

[Harald Kapp]

EN and R are still floating...

 

[D@rkL0rd]

EN and R are still floating...

i connected it...then also the pin 0 is not going high in the first loop its going high in the second loop...

 

[Harald Kapp]

After Reset, Q0 must be high. If not, your wiring is wrong.

What do you mean by loop? Draw a timing tiagram of your circuit similar to figure 5 in the datasheet.