Originally Posted by
ItsJustMe
Problems with the magnet CAN cause extra clicks - if you mount the magnet wrong so that the north/south poles are sideways, each one can trigger the sensor. However, this would result in double speed readings at all times, particularly at slower speeds.
I agree though, it's probably interference. One of the reasons I wouldn't even consider wireless.
Thanks, both of you. Maybe the fact that this section is near a radio station's antenna array has something to do with it. The bogus readings do always seem to come in this section of road. BTW, I can get extra clicks by using two magnets to go twice as fast! Of course, a well-designed receiver wouldn't be susceptible to double-clicking if the input was de-bounced correctly in software. In any case, if this is a known problem with wireless units then I won't worry about it. (An alternative explanation could have been that a bit or trace or solder joint is bad in the unit, and once it hits some speed which uses that bit the result becomes bogus.)
But please, don't disillusion me so matter-of-factly. I really
did hit 87 today.
I did, I tell you, I did! I hit 87.