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Frequency Generator with 2x Variable Resistors

toxsickcity

Hi Guys,

 

I need serious help with starting a project, I am going to connect this to a pair of Valves, these Solenoid Valves will be very precise and will be under up to 30PSI pressure.

I need to have 1 solenoid OPEN and the OTHER CLOSED or VICE VERSA...

 

I will use an Arduino to control this and I have not started yet

 

I need to make a signal output on Pin 1 and Pin 2 be opposite! eg

when Pin 1 is OFF / Pin 2 is ON

when Pin 1 is ON / Pin 2 is OFF

 

this next section I am speaking of PIN 1.. (remembering PIN 2 will always be doing the opposite!!!)

I need to have 1 Variable Resistor (VR1)(Potentiometer) to control how long pin 1 stays ON (I was thinking a value of 0-100% of VR2)

I also need a 2nd Variable Resistor (VR2)to control how long it takes for Pin 1 to reset the cycle!

 

eg the output should be able to: Pin 1 again,. remembering Pin 2 will always be opposite!

Pin 1 stays on for 1 second every 5 seconds

or

Pin 1 stays on for 100ms every 1second

or

Pin 1 stays on for 200ms every 300ms

 

I would say the range should be, here I am unsure on converting...

I want to be able to slow to 5 seconds and go fast as (10hz - 10 times/second) is 10hz = 100ms?

 

Thanks

Shaun

Parents

  • It sounds like a dual 555 timer chip (556) could perform all the timing you need - variable duty cycle at a variable frequency.

    They can operate up to 15 Volts, so should run off the same supply as the solenoids.

    Driving solenoids in opposite phase is as simple as connecting them in series across your supply and driving the connection between them high or low with a class B transistor pair.

    Don't forget to put snubber diodes across your solenoids.

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  • It sounds like a dual 555 timer chip (556) could perform all the timing you need - variable duty cycle at a variable frequency.

    They can operate up to 15 Volts, so should run off the same supply as the solenoids.

    Driving solenoids in opposite phase is as simple as connecting them in series across your supply and driving the connection between them high or low with a class B transistor pair.

    Don't forget to put snubber diodes across your solenoids.

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