Hi all,
I have a piston with double effect, can I control the position of the rod with arduino?
If yes, can I ask some tips?
Until now, I can push out the piston and to bring it back.
I have also a reed sensor, to know when stop the piston rod.
My problem is, How can I stop the piston rod?
If we knew what piston you are talking about we may be able to give an answer.
Post a link to its datasheet.
Post your code.
And please use the code button </> so your code looks like this and is easy to copy to a text editor
...R
Here the datasheet
And where is your code so I have something to relate the datasheet to?
...R
I don't have code, I can push out the piston and to bring it back with two button and a electrical valve
The Arduino can control the electrical valve using a relay or motor controller.
A limit switch can be used to detect the position of the piston.
I have a reed sensor to detect the position of the piston.
my problem is:
when I detect the desidered position how stop the piston rod in this position for 10 seconds?
when I detect the desidered position how stop the piston rod in this position for 10 seconds?
Simply de-energize the relay or motor controller that you are using to control the electrical valve for 10 seconds.
Of course, first you have to decide how you will use the Arduino to control the electrical valve, and since we have no information about the valve, we can't help.
Why do you want to use an Arduino for this?
Standard pneumatic pistons require a special proportional control valve to position them mid travel.
The valve you have is not suitable.
I need to know how it is possible to position a piston rod in a fixed
For some reason the datasheet in Reply #2 crashes my computer when Firefox tries to display it.
...R
That seems to be the exact same datasheet and I am not prepared to risk another crash.
...R
odd i had no problem with the datasheet
Boardburner2:
odd i had no problem with the datasheet
Are you viewing it in Firefox?
If so what version?
...R
i am using chrome.
cchechio:
Can I realize a system like this video?
datasheet of the piston here;
a directional valve with two solenoid;
arduino
Like the video? No. That cylinder is single action with an open vent. The tennis ball supplies the return force for the piston and the open vent allows the piston to move very rapidly
The cylinder you specified is a double action device using pressure on either side of the piston to move it. The piston can only move as fast as the air can escape from the other side. To stop and hold the piston you need to apply equal air pressure to both sides of the piston at the same time.
You can do all this with valving, but it is a lot more complicated than you are suggesting. You need to draw a diagram of all components connected together and then imagine the steps needed to control the valves for the functions you need, moving left, moving right, venting the other side to release it's pressure, and finally, to apply the same pressure to each side of the piston.
Paul
Paul_KD7HB:
Like the video?functions you need, moving left, moving right, venting the other side to release it's pressure, and finally, to apply the same pressure to each side of the piston.Paul
Unfortunatley you cannot use PWM effectivley with a compressible gas so on off switching with a valve does not work well.
An analogue (proportional ) valve is needed.
Boardburner2:
Unfortunatley you cannot use PWM effectivley with a compressible gas so on off switching with a valve does not work well.An analogue (proportional ) valve is needed.
How would a proportional valve hold the piston in position, as the OP asked?
With 5 standard valves, he would be able to do just what the video showed, plus being able to hold the piston in position.
Two valves on each port of the cylinder. One of the pair to allow venting of air from the low pressure side of the piston. One pair to allow high pressure air into the cylinder. And one valve to allow high pressure air to the opposite side to stop and hold the piston in place.
A nice Arduino project in fluid control.
Paul
Paul_KD7HB:
Two valves on each port of the cylinder. One of the pair to allow venting of air from the low pressure side of the piston. One pair to allow high pressure air into the cylinder. And one valve to allow high pressure air to the opposite side to stop and hold the piston in place.
The last part in particular doesn't sound correct. Creating a connection between both ports of the cylinder where both sides of the cylinder are pressurized would always result in the cylinder extending fully (if it's not a double-ended cylinder). To lock the cylinder in place both ports would need to be closed.
With respect to the problem as a whole I would have thought that a single, 5 port, 3 position solenoid valve would be sufficient. You would need to add flow restrictors to the ports of the cylinder in order to expect any sort of positional control of course.