• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Need a switching timer circuit

Status
Not open for further replies.

dewslat

New Member
Im a noob, so sorry for some wrong terms on this. I can barely solder but I can catch up.

I have this 3 motors with 3 wires out. it has forward and reverse to it. What I want to do is that I want to make each motor run in sequence.

Motor 1 - Reverse .5 Sec.
Moror 1 - Forward 2 Sec.

Motor 2 - Reverse .5 Sec.
Moror 2 - Forward 2 Sec.

Motor 3 - Reverse .5 Sec.
Moror 3 - Forward 2 Sec.

And loops back to Motor 1... and so on

Please please... Just have to do this project. A simple as possible will do.

:):):)
 

MikeMl

Well-Known Member
Most Helpful Member
Start with an astable (555 or something else) that runs at 2Hz (Period=0.5sec).

Now add a four-bit binary CMOS counter(like a MC14161), wired to reset when it reaches the sixteenth state, meaning that it counts 0-14, 0-14,0-14, forever.

Now, add a four line to one-of-sixteen decoder (like a MC14514).

Out0 drives mot1 reverse
A four input OR gate ( like a MC14072) wired to Out1-4 drives mot1 forward.

Out5 drives mot2 reverse
A four input OR gate wired to Out6-9 drives mot2 forward.

Out10 drives mot3 reverse
A four input OR gate wired to Out11-14 drives mot3 forward, at which point the counter resets back to zero, and the cycle begins again. Each motor period is either one clock period or four clock periods.

You will need to add power FETs between the CMOS outputs and the motor windings.

This could also be done with a modest PIC.
 
Last edited:

dewslat

New Member
Thanks.
wow.. just a diagram would do fine and also the part list.
 

MikeMl

Well-Known Member
Most Helpful Member
Thanks.
wow.. just a diagram would do fine and also the part list.
Sorry, its about half a day's work to detail out the schematic. I gave you enough info so that you can do it yourself.
 

MrDEB

Well-Known Member
I Myself would use a 4017

set up the 555 for .5 seconds then feed 2- 4017's
tap off the first output = .5 seconds
# 5 output = 2 seconds then 6 outp[ut = .5 seconds
etc.
lots easier IMHO than reconfiguring the output with gates
do a search of 4017
lots of circuits etc.
 

MikeMl

Well-Known Member
Most Helpful Member
How do you get two 4017s to count 0-14 without some gates?
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top