APPLICATION
To protect a rolling road for testing model F1 cars (used to simulate a real road) from going too fast and destroying itself and the F1 models

DESCRIPTION
To measure the speed of the road we used a universal tachometer or frequency counter packaged in a 35mm wide DIN rail mount enclosure. It accepts a maximum frequency of 5kHz. It uses the prototype analog module which accepts a signal from a hall effect sensor. This sensor was placed close to a small magnet attached to the side of one of the pulleys driving the road. This signal is amplified to TTL levels and used to calculate the frequency. The base unit is measured in Hz but the display can be modified by a factor from 0.01 to 99.99 to show the reading of choice (e.g. x60 gives R.P.M.) At this stage a "trip" value can also be set. The unit is "started" and the relay closes, powering the external machinery. The speed of the machinery is constantly measured and when the "trip" value is reached the relay drops out removing power from the external machinery.

HARDWARE
Base100 (35mm) + PSU100 (220Vac) + Display100 (4 x 7 segment) + Analog100 (prototype) + Mod100 (Relay)

FUTURE DEVELOPMENTS
Completing the Analog module