Piezo Sensing

This is the latest method in use for detecting bites, although it has advantages in some areas it also has some disadvantages.

It uses a Piezo electric sensor as used in most record players.

In a record player the Piezo stylus rests on top of a revolving record detecting the vibrations on the record and converts this to electrical energy.

In the case of the bite detector, the fishing line rests on top of the Piezo stylus and as the line moves it vibrations the Piezo stylus and converts this to electrical energy.

To function properly the fishing must remain in full contact with the Piezo stylus regardless of the direction the line is moved or the amount of pressure that is applied to it.

The difficulties with this design is

  1. More vibrations are developed when the line is pulled forward than when the line is allowed to drop back.
  2. More vibrations are developed if more pressure is applied to the stylus.

The design needs to take these considerations into account when setting the sensitivity levels. 

 GOOD POINTS

  1. Can be very sensitive especially when the line is pulled by the fish.
  2. As there are no real moving parts it is a lot more difficult to freeze up in winter.

BAD POINTS

  1. Can also be trigged by leaves, twigs or other debris that touches the fishing line.
  2. Difficult to setup sensitivity to cope with both forward and drop back bites.
  3. Because of the low voltages produced by the Piezo more electronics are required to amplify the signals, thus more chances of electronic failures and more items to varnish to protect against dampness.
  4. One of the reasons record playing arms are made lightweight, is to prevent damage to the Piezo, if this is not properly taken in to account in the design stage, damage could result when anglers fish at great distances using heavy bobbins.
  5. Piezo systems cannot indicate the true movement of fishing line, they only indicate that vibrations have taken place for a certain time period.

I.e.: Ten blips of sound could indicate a slow movement of 5mm of line OR a fast movement of 50mm both within the same time period.

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