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.
Last edited by cbiblis; 11th November 2009 at 03:16 PM.
Ok but you have to have some idea. Is it weeks, days, hours, minutes, or seconds????
Last edited by MikeMl; 11th November 2009 at 04:24 PM.
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.Originally Posted by cbiblis
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.
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.
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