08-03-2012 01:46 PM
I need to buy 4 linear solenoids that can be controlled by labview. I have found many different solenoids that will work. The problem is finding the hardware to make them run from labview.
08-03-2012 01:54 PM
I would recommend putting some more details on what solenoids (preferably data sheets) you are planning on using and what you are trying to do.
08-03-2012 01:56 PM
If you want advice on connecting your solenoids to a LV program, you will need to provide more information and ask specific questions.
Things like voltage and current requirements. Speed of changes. What controls the settings: the user or some data within the program?
What kinds of constraints do you have on your hardware selection? Do the solenoid vendors sell drivers?
Exactly what do you want from the Forum?
Lynn
08-03-2012 02:12 PM
I need to use 4 solenoid (preferably linear ) to block 4 laser beams that are one inch apart in a square formation. The solenoid has to extend in a second or less. They need to be less than 100 mm in length with a travel of 10-30 mm. Voltage and current requirements are very flexible, we would like to be able to plug them into a 120 V outlet. I have found hundreds of solenoids online.
The main problem is finding a way to control them from labview. I need a piece of hardware that can be hooked up to the solenoid and then the hardware can be plugged into the computer by using a USB cable.
People have told me that I can build the hardware but I don't have the knowledge to do that. I would rather just buy one. Also, I am not even sure what the proper name for the hardware is.
08-03-2012 02:50 PM
That helps.
One question: Do you want to completely block the beam in an on-off fashion or do you want to partially block it, for example 20% or 50%?
This makes a huge difference in the selection of the solenoids and controls.
Lynn
08-03-2012 02:53 PM
I need to completly block the beam in an on/off fasion. The solenoid need to be retracted or extended. So there are only 2 positions for it to be in.
08-03-2012 03:01 PM
Mostly solenoids work in that way (On/OFF). Simple way would be Buy any solenoid according to your requirement connect it with the relay (With suffiecient power to drive the solenoid) and hook up the relay to the NI DAQ card so by controling the Relay you will be able to control the solenoid.
08-03-2012 03:10 PM
OK.
That is the easiest.
Pick any solenoid which meets your physical size and travel distance requirements and has a 120 V coil. Be aware that at the extreme extension, solenoids exert much less force than the maximum specified force when nearly closed.
Then buy a solid state relay (SSR) with 120 VAC output and low voltage DC input (typically 3-32 VDC). Choose any USB DAQ device with at least 4 digital outputs.
Drive the SSR from the DAQ device digital outputs.
Lynn
08-03-2012 03:13 PM
@johnsold wrote:
OK.
That is the easiest.
Pick any solenoid which meets your physical size and travel distance requirements and has a 120 V coil. Be aware that at the extreme extension, solenoids exert much less force than the maximum specified force when nearly closed.
Then buy a solid state relay (SSR) with 120 VAC output and low voltage DC input (typically 3-32 VDC). Choose any USB DAQ device with at least 4 digital outputs.
Drive the SSR from the DAQ device digital outputs.
Lynn
I have to learn to reply like you in detail (for that I should have good knowledge 🙂 )
08-03-2012 03:32 PM
Meh; you can get a little 5V linear solenoid for pretty cheap. The mass you're moving is a card to block a beam; you don't need a lot of force to move that.
A "Latching" solenoid stays where you put it - drive it out and cut teh power, it'll stay out. A non-latching solenoid has a spring return (or may depend on something external like a spring or a load to pull it back) - when you cut power to it, the piston will return to its normal position.
The "Stroke" is the change in position of the piston. What kind of fixturing do you have, and what's the diameter of the beam?
You'll probably need a power supply and driver circuit to provide current to move the solenoids. I like the ULN2003A chips, they're easy to work with and play nicely with DO's on the DAQs.
The other option would be to use a stepper motor with a wheel on it that has slots for the light to pass through. Some design work on the mechanical side could probably get you a wheel that would block or pass any combination of lazors with one motor and one wheel. Ther will be some work on the software/logic side to figure out where you are and where you need to be to get a certain lazor pattern output.