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#1
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Pneumatics sensors?
My team has no experience using pheumatics, and we are looking for a sensor, not a gauge, that will tell us our P.S.I. Recommendations please.
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#2
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Re: Pneumatics sensors?
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#3
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Re: Pneumatics sensors?
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R77 The only pneumatic system items permitted on 2014 FRC ROBOTS include the items listed below. F. Pressure transducers, pressure gauges, flow control valves, and connecting fittings, Last edited by cmwilson13 : 01-02-2014 at 17:44. |
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#4
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Re: Pneumatics sensors?
We use this sensor from SSI Technology. It returns an analog signal that relates to pressure. It's somewhat non-linear so some software will be involved.
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#5
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Re: Pneumatics sensors?
We have used this before for some off-season testing but never in competition, so I'm not sure how well it will work but it's much cheaper than other models I have seen.
http://www.ebay.com/itm/Pressure-transducer-or-sender-150-psi-stainless-steel-for-oil-fuel-air-water-/251362960044?pt=Motors_Car_Truck_Parts_Accessories &hash=item3a866662ac&vxp=mtr |
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#6
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Re: Pneumatics sensors?
Quote:
Still...Why? Unless you were trying to somehow regulate air pressure, perhaps by bleeding off air to drop pressure so you could get a "lower power" cylinder output or something, what is the benefit of having real-time pressure on your dashboard? I'd want the pressure to always be at maximum...and would design my storage system so it never drops below that during a match. |
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#7
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Re: Pneumatics sensors?
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#8
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Re: Pneumatics sensors?
The last time we had a pneumatic catapult we had adjustable third stage pressure to vary the shots. The operator would adjust the pressure watching feedback on the Dashboard to shoot farther or make closer shots.
Other years it told us how many times we could fire some mechanism's cylinders in succession, or when some real air hog needed time to build up reserve pressure. |
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#9
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Re: Pneumatics sensors?
I have always wanted to try to keep a running approximation of pressure just using observations. Something like:
Code:
if (compressor just stopped running)
approximate psi = 120
else if ((compressor just started running) and (approximate psi > 110))
approximate psi = 105
else if (compressor is running)
approximate psi = approximate psi + (1 psi/second)
else
approximate psi = approximate psi - (0.02 psi/second)
if (piston1 is actuated)
approximate psi = approximate psi - 10
if (piston2 is actuated)
approximate psi = approximate psi - 30
Has anyone done something similar to this? I am curious to know if it was successful. |
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#10
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Re: Pneumatics sensors?
We did that for our 2003 robot.
The drive system was dependent upon having adequate pressure at all times, so the pneumatic arms were limited if the system thought too much air had been used. Make sure you have a big obvious indicator to the drivers as to why mechanisms may stop working mid-match. It worked quite well except for once when we drove under the bar with the arms too high and ripped off the fittings releasing all of our air with one whoosh... Last edited by Mark McLeod : 01-02-2014 at 19:31. |
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