The bicycle accidents and injuries have number of reasons: for example the lack of protective equipment; inappropriate speed for the road conditions; abuse of alcohol and drug; and - unfortunately - the inadequate visibility.

The main feature of my project is the Fuzzy logic based visibility system. What is the Fuzzy logic? In contrast to the binary (yes-no) logic, there is not sharp boundaries in the Fuzzy logic. A typical fuzzy sets shown below:

There is a variable (e.g. temperature, deflection, illumination, etc.) and several (here three) sets. Each input case has a probability the extent to which a member of the set. For example, if the input is -50, it means that the input belongs to 76,5% of X feature and 23,5% of Y feature. In any case, the sum of the probability is exactly 100%.

In the case of designed system, the variable is the resistance of LDRs (~illumination), and there are 3 features: light, transition and dark. The output is set by experimental measurements.

The reaction time depends on two factors, as shown in the table below:

The table shows that how much time (millisec) is needed to the system be activated within given speed and given distance. This can be interesting if we go into a dark tunnel.

The lighing system consists of two parts, an active and a passive part. The active part consists of network of LEDs, which are driven by battery via PWM controlled MOSFET. The passive part consists of very well quality reflective strips.

HAHÓ MAGYAROK!

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