Elektron. Pferd (Ton-Generator)

The disadvantage of most wind direction meters is the need for complicated mechanical drive systems which are necessarily prone to wear. The unit described here is intended to offer a solution to this problem. A disc which contains a number of slots is attached to the spindle of the weather vane. A light source is mounted above the disc, and a row of 3 light dependent resistors (LDRs) is situated below the disc -as shown in figure 1. Which LDRs are illumina-ted will depend upon the position of the disc, and therefore upon the direction of the wind.