Electronic weather vane
Binary bcd slot disk 

3 Bits 8 direction	4 Bits 16 direction
5 Bits 32 direction	6 Bits 64 direction
7 Bits 128 direction	7 Mask Bits

  Correlation table

3 Bits 8 direction q =45°

4 Bits 16 direction q = 22,5°

5 Bits 32 direction q = 11,25° (à partir de 5 bits il y a deux codes pour la position)

7 Bits 128 direction q = 2,8125°

16 Dels

Binary bcd slot disk

74LS155 or equivalent

Gas cartridge whose bottom is cut or another system

Power 5V 1A

The electronic device is based on optoelectronic coupling. The position indication is made with 16 LEDs distributed over 360 ° of the compass rose, which gives a resolution of 22.5 °.

The sensor consists of 4 infrared LEDs and 4 phototransistors and output transistor.

For the wired connection it is advisable not to exceed 50 Meter.

A Slot disc, BCD-coded disk is used in conjunction with a 74LS154 or equivalent.

The "sensor" part of the wind vane is sheltered under a hood which is a gas cartridge whose bottom has been cut.

The indicator part consists of a 5V 1A power supply of a circuit including the 74LS154 decoder and 16 LEDs arranged in a circle.

There is no adjustment the operation must be immediate.

To build disk,

First row: start by coloring two blocks, leave two spaces, coloring two blocks  ….

Second row: Color 4 blocks so the beginning is under a block of the first row and the end is also under a block of the first row.

Third row: Color 8 blocks so the beginning is under 2 blocks of the second row and the end is also under 2 blocks of the second row.

Fourth row: Color 16 blocks so the beginning is under 4 blocks of the third row and the end is also under 4 blocks of the third row.

Etc. for more bits.

4 Bits 16 direction q = 22,5°

Another version of wind vane