Clock & Timer Circuit DiagramsLCD-LED Display

Wind Direction Indicator Schematic Circuit Diagram

Understanding Wind Direction

The wind direction indicator signifies the path in which air is moving within the atmosphere. An indicator has been designed to display eight distinct wind directions through LEDs. Reed contacts, energized by a permanent magnet, serve as the sensors. The mechanical design is crucial to ensuring that only one reed contact can be closed at any given moment.

Wind Direction Indicators

A variety of tools, such as wind cones, wind socks, tetrahedrons, or wind tees, can function as wind direction indicators. Typically positioned centrally near runways, these indicators might be placed within a segmented circle. Especially if the traffic pattern direction deviates from the standard left-hand pattern. The wind direction indicator provides a clear depiction of wind direction and a general sense of wind speed.

Wind direction indicator Schematic diagram

Detecting Wind Direction Changes

Upon the moment a reed contact closes, a clock pulse is sent to the clock inputs of D-bistables (flip-flops) in IC2 and through an OR gate in IC1. This action makes the outputs of the bistables mirror the status of the D inputs, ensuring only the LED associated with the closed reed contact illuminates.

Responsive Wind Direction Indication

If the wind experiences a slight shift in direction, causing the reed contact to open, the LED will continue to remain lit due to the bistable design. It’s only when the wind changes direction significantly enough for another reed contact to close that a different LED will illuminate.

Power-On Initialization and Operation

When the supply voltage is turned on (S1), only D9 will light. Thanks to the power-on reset triggered by R10 and C3. As soon as one of the reed contacts causes a leading transition (edge) at the clock inputs, one of the direction LEDs (D1-D8) will light up. The indicator requires a stable 5 V supply and consumes a current not exceeding 10 mA. Low-current Siemens LEDs are used in this design.

 

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