If you need to go to places where the sand is soft and deep you'll be spending a lot of time on your knees beside 6 wheels attending to tyre pressures - first squat beside each wheel in turn to deflate. It's definitely a young man's job, holding that deflator two-handed to each valve for long minutes while the sibilant hiss of escaping gradually diminishes and the flies relentlessly attack and your knees burn like hot coals while the sun smites you mercilessly from above.
Then it's time to re inflate. Screw the hose onto the valve, walk back to the pump to switch it on; wait and watch until the tyre seems the right shape, walk to the compressor and switch it off, walk back to the wheel and check the gauge. Some more air required - walk back to the pump and turn it on. again, wait a little more and try again, and again. Repeat for all four wheels plus the two on the trailer.
There must be a better way.........
And there's a flashlight button provided in case you're doing this in the dark.
The system can work in either of two modes - Manual or Automatic.
In the Manual mode the Remote Control continuously updates the mobile phone with pressure information coming from the transducer connected to the inflation hose. The user taps the compressor button to start the compressor, or the deflator button to open the exhaust valve. The Remote will continue to update the mobile with pressure information, but this is of limited value while air is moving into or out of the tyre since the pressure in the hose will differ from that in the tyre. Once the user taps the cancel button for either the compressor or the exhaust valve the pressure stabilises and a reliable reading is shown on the mobile phone. The Remote Control keeps the mobile informed of the state of its outputs and the mobile displays the state of the operation by defragmenting the icon of the operational device.
To use Automatic mode the user dials the target pressure into the relevant window using the up and down buttons and taps the Auto button. The mobile sends the Auto command together with the target pressure and the tyre size modifier to the Remote Control, which determines which way the pressure should go and approximately how long the operation should take. It keeps the mobile updated with the current pressure (not very meaningful at this time), the state of the outputs, and the number of seconds left in the current operational cycle.
Once the estimated time has elapsed the Remote control switches off whatever output was active and allows five seconds for the pressure to stabilise.If the current pressure is within 50 mbar of the target pressure the Remote exits Auto mode and causes a beep at the mobile to tell you to progress to the next wheel. If the pressure is more than 50 mBar from target the Remote Control calculates another cycle and initiates it as before. This continues until the difference from target is 50 mbar or less.
The time periods caculated by the Remote Control are generic averages. In real life the time needed to inflate varies with compressor capacity and operating voltage, and deflation rates are dependent on tyre valve apertures. To allow some compensation for these variances the tyre size modifier L (large) and S (small) may be repeatedly long-clicked to alter their values to 120%, 140%, 160%, and 90%, 70%, 50% respectively, so the algrithm can be modified to deliver between 50% and 160% of the mean.
The flashlight button is provided for night-time work.
The T- Piece
A T-junction must be introduced into the air-hose to give the Remote Control access to the airway. This T will lead to a quick-disconnect coupler at the entrance to the controller's housing for convenience of stowing, and also to allow the controller to be isolated in the event of a malfunction. When disconnected the aperture from the compressor side will be closed. Both sides of the quick-disconnect coupler are provided as well as the T-junction, both of which will be compatible with 10mm hose.
If you are using a compressor with some muscle - not one of those toys that plug into a cigarette lighter outlet and that get zipped into a little bag and kept under the seat, you'll be connecting directly onto the battery with at least a 50 Amp DC connector. Most people would want to keep the engine running at idle to prevent unnecessary discharge of the battery while operating the compressor.
Under these circumstances there should not be enough volt-drop to the compressor to affect the operation of the remote control unit. If Bluetooth communication should fail while the compressor is drawing power it points to a connection problem that undoubtedly also inhibits proper functioning of the compressor and requires urgent investigation.
The length of cable between battery and compressor should be limited to about 2 metres if possible, and that silly spiral plastic pipe should be replaced with 10 metres of 8mm silicon rubber hose. Crossing soft sand is serious work and requires competent and reliable equipment.
Price - R1800.00
Includes controller,quick-disconnect coupler, T-junction WhatsApp and email support. Ourageously expensive? There's a few components like pressure transducers and heavy current switchers that have no Chinese source, but we cannot do the job without them.
Excludes shipping charges.
Additionally you will need an effective compressor, R2500 air hose that is compatible with the application R300, and the usual accessories for delivering air to the tyres. All this so you can cross a patch of sand.
PostNet offers a counter-to-counter service for R99 that takes 2 to 3 working days, and this is what many people opt for. Delivery to your door is available from PostNet at additional cost.