Somthing where you can put it into a tube or into the air tank, and measures in 5 or 10 psi intervals with little tick marks for every 1 or 2 psi. this is just a rough idea, any coments, questions, worries, fears would be welcomed by me.
(Sorry if a thread like this has already been posted)
Yes, this would be useful. I don’t trust our air compressor’s gauge. One could connect it to the tank with tubing (or directly into one of the tank’s tubing ports) and have a constant pressure readout.
This would be even more useful if it could provide feedback to the cortex, similar to the power expander status port. I don’t know if that could be done cheaply enough though, based on a quick google search these types of sensors cost anywhere from $200 upwards.
You could make a simple pressure sensor with a cylinder that pushes a switch if it has enough pressure (force) to overcome some kind of elastics pulling the cylinder back. Something that would be easier to calibrate would be using a potentiometer on a pinion, where the piston pushes the rack on linear slides.
Ryantech tried that in the Gateway Q+A (including the claim that it was non-functional) and Karthik clarified that yes it was definitely illegal. It’s not non-functional if its function is to indicate how much pressure is in the tank.
I don’t know if Q+A answers officially continue to apply when a new season starts, but I expect you will get the same answer.
Not sure what the point of the pressure sensor is in VEX though since you can’t have an aircompressor.
Actually, an air pressure sensor like they have for the LEGO Mindstorms might be useful. Here’s one example: [http://www.techno-stuff.com/NAP.htm. Obviously, you would need one with a higher pressure range for VEX.
The analog output would be similar to the status port on the Power Expander. Even though there isn’t a VEX compressor, you could monitor the air pressure and maybe have your program disable the pnuematics if the pressure drops too low.
No need to pay that much. For $32 you can get something like this. It will run on 5V and should wire directly to a Cortex Analog port and provide a pressure reading between 0 and 100PSI. Not sure of the Vex Pneumatic tubing ID, so this exact part may not be a perfect fit…
I also feel that a Pressure gauge would be useful. However, even if the pump is not correct for pressure, it should remain consistent on how off it may be. So if you pump up to 150 psi (on the pumps gauge) and it truly is only 100 psi. If you do it again, it’s going to fill it the same amount (Unless your pump is completely shot).
In that case when we filled it, we set how high we fill it (according to the gauge) and we just counted how many hits we got. It was consistent every time in amount of hits, that’s what we’re more concerned about, not the psi.