Wireless air operation.

billvv said:
Sounds like a fun project. Those Android head units like Xtrons, Joying do some of that. They excel at sound systems and GPS; tie-in with ODB2/Canbus. I wonder if you created a Canbus I/O box for real-time control and monitoring and piggybacked on that technology for display and UI - since that is the most likely component to want updating going forward.
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Yeah, Canbus tie-in is inevitable for the vehicle side of things. The joys of bridging analog to digital...
 
KenTexian said:
Thanks Matt. I usually stay away from wireless/bluetooth solutions. This is more a project for the hobby and is waaay on the back burner.
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Only the keyfob is wireless and it is redundant to the dash controls (except that it can operate each bag up/down independently). Operation from the dash is via pushbuttons that are supported by a circuit board and physically wired to the level sensors. Dash up/down buttons control both sides together. Also dash buttons for auto drive leveling, and campground leveling.
 
billvv said:
Only the keyfob is wireless and it is redundant to the dash controls (except that it can operate each bag up/down independently). Operation from the dash is via pushbuttons that are supported by a circuit board and physically wired to the level sensors. Dash up/down buttons control both sides together. Also dash buttons for auto drive leveling, and campground leveling.
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Oh, I see, that's not so bad then.
 
RF_Burns said:
Matt,
For the wireless air system, I was going by the rally presentations by John Shotwell and Gary Bovee (can be found at GMCMI site) and other on-line information.

It does not have a height control sensors, but does keep the air pressure in each bag within +/- 3 psi of the setting according to documentation. I cannot find any info saying you can defeat the auto adjustment of the pressure... short of disconnecting power to it.

I'm just wondering how this auto pressure adjustment affects the coach in real life operation. Because of this and not having active height sensors, I would not suggest this system.
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old thread, but... I have John Shotwell's old coach, with the wireless system...bought the coach from the guy who bought it from the Shotwell's about a year ago...anyways the wireless system cycles the compressor when driving, and it is a bit irritating... long hills, its always adjusting...

Anyone know if theres a way to adjust 'deadband' or hysteresis to where it takes longer to respond to tiny pressure changes? 1 psi is about all it seems to take before its venting or running, seems if a 1 minute delay were added, it would still auto level without all the unnecessary cycling... just wondered if anyone ever found a way to do so- thanks in advance, tim
 
TC429 said:
old thread, but... I have John Shotwell's old coach, with the wireless system...bought the coach from the guy who bought it from the Shotwell's about a year ago...anyways the wireless system cycles the compressor when driving, and it is a bit irritating... long hills, its always adjusting...

Anyone know if theres a way to adjust 'deadband' or hysteresis to where it takes longer to respond to tiny pressure changes? 1 psi is about all it seems to take before its venting or running, seems if a 1 minute delay were added, it would still auto level without all the unnecessary cycling... just wondered if anyone ever found a way to do so- thanks in advance, tim
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The developer of the system is @Keith V , perhaps he can help.
 
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TC429 said:
old thread, but... I have John Shotwell's old coach, with the wireless system...bought the coach from the guy who bought it from the Shotwell's about a year ago...anyways the wireless system cycles the compressor when driving, and it is a bit irritating... long hills, its always adjusting...

Anyone know if theres a way to adjust 'deadband' or hysteresis to where it takes longer to respond to tiny pressure changes? 1 psi is about all it seems to take before its venting or running, seems if a 1 minute delay were added, it would still auto level without all the unnecessary cycling... just wondered if anyone ever found a way to do so- thanks in advance, tim
Click to expand...
From my earlier post in this thread:
For the wireless air system, I was going by the rally presentations by John Shotwell and Gary Bovee (can be found at GMCMI site) and other on-line information.

It does not have a height control sensors, but does keep the air pressure in each bag within +/- 3 psi of the setting according to documentation. I cannot find any info saying you can defeat the auto adjustment of the pressure... short of disconnecting power to it.


So +/- 3 psi is the spec which is not very much as you drive down the road. It doesn't say how long it averages the samples before determining if a change needs to be made. Powering the unit OFF or disconnecting power through a switch maybe the only way to implement a "HOLD" function.
 
LQQKatJon said:
I know Jim Hupy out of Salem, OR was making and selling the wireless for years. Not sure Jim’s status of today. Hope he is still healthy.
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I've heard of folks in my area visiting with him somewhat recently, but I don't think he really maintains an online presence anywhere.
 
GMCMI Fall 2026 Rally
Applied GMC

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