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    Senior Member oyama's Avatar
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    Default timer

    Hi All,
    i need some help in making a 20min or more timer .
    i have setup a rainwater tank with a float switch, once water has reach the top the pump switches on and fills my 30000 l tr pool. problem I'm facing is when it's raining heavily pump switches on and off 30sec to 1min interval depending on the rain. if i can come up with a 20 min timer would solve that problem.

    currently the switch is attached to a relay, not sure how to keep the latch on after switch has gone open, I'm a newbie still learning lol.

    Any help would be greatfull

    Oyama



Look Here ->
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    Junior Member TZB's Avatar
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    Here's a plan similar (if not the same) as the one I posted on here before the crash. I use it to switch off a washing machine when a barrel outside is full of waste water. This barrel gravity feeds via a hose onto the lawn.



    I didn't use the bottom probes as I wasn't using a reservoir tank. Instead I took pin 13 on the 4001 IC low (to ground). Parts for this were least that $10, excluding the power supply.

    This will do what you what, is a fun little project and fairly easy.

  • #3
    Senior Member oyama's Avatar
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    thanks buddy, will give it a go
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    Senior Member oyama's Avatar
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    Hi TZB,
    i gave it a go over the weekend & noticed R3 100m riesistor i thought they only went up to 10meg. what could i use instead ???

    Tia
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    Quote Originally Posted by oyama View Post
    Hi TZB,
    i gave it a go over the weekend & noticed R3 100m riesistor i thought they only went up to 10meg. what could i use instead ???

    Tia
    I think it's a typo. Should be 10 meg, like the other 10 meg / 0.1uF RC network near it on the cct.

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    Senior Member oyama's Avatar
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    Quote Originally Posted by Studio1 View Post
    I think it's a typo. Should be 10 meg, like the other 10 meg / 0.1uF RC network near it on the cct.
    thanks for the reply studio1,
    does that mean r1 should also be 10meg ???

    Tia
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    Senior Member BCNZ's Avatar
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    Hmmm, I've just had a closer look at the circuit and I'm at a loss to understand why it says 100M.

    R1 = 1 M, R2 = 10 M, R3 = 100 M.

    All these resistors are doing is providing a time constant in conjunction with the associated 0.1uF cap.

    R2/C2 will take 10 times as long to charge as R1/C1, and R3/C3 will take 10 times as long as R2/C2.

    Rather than use a 100 M value for R3, I would have simply made C3 a 1uF.

    It's too late in the evening for me to nut out how the gates are switching on the circuit, so I can't comment on the relevancy of the values of the caps.

    I've never seen a circuit of this kind using a 100 M resistance. That would require 10 x 10 M in series - it's a pretty high value.

    Maybe TZB can shed some light on this.

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    I'll have to rip open my unit as it was a couple of years ago when I made this this circuit. I'm no electronics expert though and what i did was experiment so the N4 gate was always switched on as I wasn't using a reservoir. IIRC I didn't use pin 13, I took it either high (on) or low (off), sorry I can't remember the logic of the CD4001 IC. I will take a look this weekend.

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    Senior Member oyama's Avatar
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    thanks guys i appreciate the help.

    all i really need is once the water has reach the top float switch pump turns on until it reaches reserve or the bottom float switch.

    Tia
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    I just remembered a system I worked on many years ago. It was an effluent pumping and processing plant in a small community and it had an Omron floatless level control unit.

    Have a look at this: as it may do exactly what you want without having to build something.

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    Senior Member oyama's Avatar
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    Quote Originally Posted by Studio1 View Post
    I just remembered a system I worked on many years ago. It was an effluent pumping and processing plant in a small community and it had an Omron floatless level control unit.

    Have a look at this: as it may do exactly what you want without having to build something.
    that would of been perfect, if i didn't purchase everything.
    currently system i made works well but on manually would like to add a little electronics to do it automatically.
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    Yeah the 61F is good, but expensive. The above circuit does exactly what the 61F does at a faction of the price. Also building it gives you that pleasure that comes with making something yourself. Building this little project also gives you an insight into digital logic electronics.

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    Quote Originally Posted by oyama View Post
    thanks guys i appreciate the help.

    all i really need is once the water has reach the top float switch pump turns on until it reaches reserve or the bottom float switch.

    Tia
    My setup is similar to what you require. I have a smaller collection tank which feeds to a large storage tank. When the collection tank is full it dumps to the storage tank then turns off when empty. This circuit has been working fault free for 5 years now & you cant get one more simple. Give me a pm & maybe I can fax it. Total component count - two miniture relays , one heavy duty relay , one scr & two resistors

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    Senior Member oyama's Avatar
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    Quote Originally Posted by watchdog View Post
    My setup is similar to what you require. I have a smaller collection tank which feeds to a large storage tank. When the collection tank is full it dumps to the storage tank then turns off when empty. This circuit has been working fault free for 5 years now & you cant get one more simple. Give me a pm & maybe I can fax it. Total component count - two miniture relays , one heavy duty relay , one scr & two resistors
    Thanks watchdog,
    perfect that did the trick, thanks to all that helped much Appreciated
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    Excellent. How about post his circuit schematic ?

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    Senior Member oyama's Avatar
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    Quote Originally Posted by TZB View Post
    Excellent. How about post his circuit schematic ?
    Here you go very simple
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    Senior Member oyama's Avatar
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    Quote Originally Posted by oyama View Post
    Here you go very simple
    cct removed : i didn't have permission
    Last edited by oyama; 19-05-08 at 02:03 PM.
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    hey oyama - I really think you should have asked before posting the cct. I know it isn't much but it is mine.
    On a side note , that is the trouble with electronics today - everything is more complicated than it needs to be.

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    oyama - no big deal , just a courtesy. My sensor was a 25mm length of conduit attached to the tank so as to mimic the water level. Inside this was a short 15mm length of conduit with a magnet top & bottom. This was sealed to act as a float.The reed swithches were fitted to the outside of the 25mm and could be positioned whereever required. I wanted to keep away from coductive sensors because they are a pain in the arse. This way the only thing in water is a piece of pvc with magnets attatched. If you've got any questions give us a pm

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    Senior Member oyama's Avatar
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    Quote Originally Posted by watchdog View Post
    oyama - no big deal , just a courtesy. My sensor was a 25mm length of conduit attached to the tank so as to mimic the water level. Inside this was a short 15mm length of conduit with a magnet top & bottom. This was sealed to act as a float.The reed swithches were fitted to the outside of the 25mm and could be positioned whereever required. I wanted to keep away from coductive sensors because they are a pain in the arse. This way the only thing in water is a piece of pvc with magnets attatched. If you've got any questions give us a pm
    just bought 2 of these did the job
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