[Adrian Jansen]

On 7/3/2013 1:44 PM, Spehro Pefhany wrote:
On Thu, 07 Mar 2013 12:49:27 +1000, the renowned Adrian Jansen
wrote:

You are right, but seems like someone has solved the RF problems once
for each of the useful bands, then its a piece of cake to interface with
sensors and one end and display/alarm at the other.

For an example, the tyre pressure monitor systems at 433 MHz. 10 gram
package, including battery, you screw on a tyre valve. Monitors tyre
pressure and temperature for about 1-2 years of operation. Reports real
time, every minute or so, to in-car readout.

Frequently fails mechanically, causing loss of tire pressure, allows
tire shops to charge for a "rebuild kit" whenever they swap a tire,
requires a trip to the dealer (or specialized equipment/knowledge) to
replace, even with an OEM replacement part.. other than that, they're
just spiffy.


Best regards,
Spehro Pefhany


Really I was commenting on the RF stuff. Certainly that seems to work
as well as needed. Whether the rest of the design is as good as the RF
section is a different kettle of fish.

The aftermarket units using sensors like Tyredog seem to have a learning
mode to accomodate sensor changes without special tools.

Personally I would be happy if the system just warned that a tyre is
going down, before it wrecks the tyre. Identifying which tyre is at
fault is a secondary, and usually very easy, job.

--
Regards,

Adrian Jansen adrianjansen at internode dot on dot net
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