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Research Report The system I choose to research is a simple open-looped system called the Vehicle Frost Box This system is used to informing motor vehicle operators that likely conditions for icy roads are developing Black ice cannot be seen and is a prime contributor to vehicle accidents during the winter months If used this simple system could actually save precious time money and physical injury For system development the Problem Statement is Black ice cannot be seen on roads causing safety hazards for drivers Next the Need Statement is We need a way to determine when favorable weather conditions exist to form black ice on roads Last the Requirement Statement consists of the following the system must be cheep reliable and linear with a low thermal mass allowing a quick response to variation in air temperature There is a system already in use that is cheep This system uses a liquid crystal strip attached to the drivers wing mirror However this attachment location is too high from the ground to properly determine road conditions Additionally some cars have heated mirrors which would render this system useless A silicone semiconductor junction in the shape of a diode was chosen to build the design around This option filled all the requirements listed in the Requirement Statement Optional sensor devices were thermistors thermometers and thermocouples These options were discarded because of high cost The basic design of the frost box follows Powered by vehicle ignition Uses a remote temperature sensor mounted close to the road surface Display is a single tri-color Light Emitting Diode LED Mounted on the drivers console Three modes indicating variations of external temperature 4C steady green light 4C steady red light 0C alternating green red light The design is based around a type 324 integrated circuit that contains four opamp blocks Each
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