FYP 2 (WEEK2)

WEEK 2

Title of Activity
-Preparing and doing some modification for sensor


Objective
-To identify the suitable sensor for this project

Mercury Sensor Switch

Mercury Sensor Switch Casing

Block Flow of Project

Problem Statement

• Using IR sensor is quite dangerous to human eyes because the percentage to get blind is 80% from the research that have been made.

• IR sensor cant detect the eye movement accurately. Human eyes are different from each other and this will make it is more hard to measure precisely.

Solution for Problem Statement

• The alternative is to change to IR sensor to mercury sensor switch.

• Using mercury sensor, it will detect the posture(head movement) of human body while driving. 

Result and Analysis

• Mercury sensor allow or interrupt the flow of electric current in an electrical circuit in a manner that is dependent on the switch's physical position or alignment relative to the direction of the "pull" of earth's gravity, or other inertia.

• It was noticed that  the sensor responds quite quickly to changes of the mercury concentration  in  air. 

Conclusion

From the research,a few solution have been identified.The sensitivity of the drop to gravity provides a unique sensing function, and lends itself to simple, low-force mechanisms for manual or automatic operation. The sensor are quiet as there are no contacts that abruptly snap together. The mass of the moving mercury drop can provide an "over center" effect to avoid chattering as the switch is tilted. Multiple contacts can be included in the envelope for two or more circuits.


References

1. Vibrator Sensor
2. Mercury Switch Sensor