Forum Discussion

laj32's avatar
laj32
Explorer
Jul 07, 2016

Leveling with Automatic Jacks

I made a "wireless rv level" unit (search it on amazon) which displays your left-right and front-back level on your phone. Moving forward I have created a hardware interface to basically control the up/down for an electric jack, which can be controlled by the App, either automatically (based on the RV LEVEL's data stream) or manually.

Most auto-levelers I've heard about typically adjust both right jacks or both left or both front (when there are two) or both rear, always in pairs, as I think it should be. But are those jacks able to detect when they actually touch the ground (in the case where one touches first, does it know not to keep pushing, possibly causing a twist?).

Does anyone know if/how they are getting feedback from the jacks to determine if a jack has made contact or not, and do the auto-leveling jacks have dual sensors to detect if one corner is raised more/less compared to the opposite corner? Some levelers and apps say they can tell you which corner to raise or lower, but, technically, that would require two physically separate sensors to be able to measure the difference (the twist). A single sensor only measures in one spot and can not detect a twisted unit.

Do you even WANT the ability to control jacks individually? Do you care to detect the twist? To me it seems the jacks should be independently controlled with power-feedback on each jack to detect when and how much force is being applied on each independent jack, indicating ground contact, at which point they can be raised and lowered in pairs to maintain a square unit.

I'd love to hear your comments on hour Yours works, and how they could work better for you. I am currently working on it with my popup trailer, which hardly needs a jack but I am installing one on the front and integrating it with the App. You can download the app on Google Play, free, it works without the RV LEVEL hardware as well by using the phone's internal sensor so you can see where I'm going with this. madebyjoe.net has links to the existing hardware and app.

Thanks for your input.
  • When it wants one side it ties those two together. When it wants rear it ties those two together and so on, no twist, and simple.
    When the jacks are tied together and one hits the ground, the pressure is equalized between the two and it waits for the other one to hit the ground and then they both continue together.
  • The jacks all have computer boards in them OR they'll have a computer board in the controller. Is the app written by the manufacturer or aftermarket?
  • HWH computerized Auto systems
    They use a pressure switch on EACH jack that sends a signal when each jack touches the ground and just barely lifts. HWH systems will level the side/corner that shows the Yellow lights indicating THAT section needs to be lifted to level. Once that section is lifted to get the RV level, the system then extends the other jacks to just touch the ground. IF the RV is level before the system operates, all 4 jacks will extends at the same time and once each jack touches the ground and starts to lift that jack will shut down when that pressure switch is closed from the pressure. Also HWH is Bi_Axis leveling. That means 2 jacks are always going together to prevent twisting of the frame.
    Powergear systems have different Auto types. The common system is the 2 front Jacks are connected thru a T and both jacks will extend to prevent twisting the front to keep from popping out a windshield. Doug
  • crasster wrote:
    Is the app written by the manufacturer or aftermarket?


    I wrote the app and made the hardware. All my own stuff. Making it up as I go along.

    The App and RV LEVEL hardware is my own home made project that I sell on amazon. I am experimenting with adding the jack-controller functionality to the app. Mostly for my own use, but I want to cover all the possible scenarios for different RV's.
  • dan-nickie wrote:
    Some links and pictures would be nice.


    The link would be http://MadeByJoe.net for the existing App and RV LEVEL sensor hardware.

    I just finished building a controller to manage one jack, which is all I need right now. The jack is simply a $100 electric A-frame tongue jack for which I simply replaced the manual switch with relays to control the power and direction. I'll post a pic/vid once I have the app controlling the jack. Eventually the App will have controls for up to four jacks supporting various configurations (in case you only have one jack up front).
  • dougrainer wrote:
    HWH computerized Auto systems...


    Good stuff. Thank You All!