There are so many schematics out there for the different usages of the 555 and alot of terminology for each circuit that i don't know.
I was hoping someone could point me in the right direction for a specific usage.

What i want to do is to build a circuit that will turn power on to a 4v motor for a variable time frame ( maybe a pot adjustment) then turn off for a adjustable time frame the same way. I have a solar tracker that does this.
Thanks

 

How long on, how long off?
Do you want to switch the motor positive wire or the motor negative wire?

__________________
Mike ML.

 

I probably will switch the positive pole. (Unless it's easier to do the negative, the motor is bi-polar) As for the time frames. i'm not quite sure, hence the variable portion. Until i build your 12v to 4v step down circuit i won't know the timing span. Do i have to set it without variables? I was hoping that i could incorporate pots to vary the time on/off.

 

Ok but you have to have some idea. Is it weeks, days, hours, minutes, or seconds????

__________________
Mike ML.

 

oh, The on time should be around 15 seconds, and the off time would be 30 minutes.

 

30 min is too long for a 555. Now it gets more complicated

__________________
Mike ML.

 

how about 2 second for 1 minute?

 

What i'm trying to accomplish is 24 revolutions per day. That is the perfect setting however i can accomplish that will suit my needs perfectly.

 

That is better for a 555.

What is the supply voltage (not the motor voltage), but the actual power supply you want to run this on)? I have an idea on how to incorporate the motor voltage reducer at the same time.

__________________
Mike ML.

 

24 per day is once per hour, which is way too long for a 555 type timer.

Dont you really want a 1/2 revolution each time? How do you get exactly one/half revolution? Do you have a limit switch or indexing switch?

__________________
Mike ML.

 

i will post in a minute i have to add a picture to this to better explain the motor setup.

 

Ok as it is, the motor at 12v rotates 1 time every 15 seconds @ 4v is rotates 1 round per 45 seconds.
As for the supply power 120v would save me the room on the pcb but 12v supply will suffice. I have more transformers to use, just limited space.

Attached Thumbnails

 

 

Ok, now I am totally confused. Do you care where the motor arm stops, or do just want to move a random amount each time you move it?

How far does the motor turn each time the 555 timer's output is ON?

__________________
Mike ML.

 

It doesn't matter which position that it stops each time it just has to make 1 full revolution total 24 times a day. So it could move for 1 or 2 seconds then stop for max time. then repeat. the arm makes full rotations. i don't have limit switches on the arm.

 

rotating 24 times a day would be perfect but it can make more rotations if it has to. Just as little as possible.