
16 | P a g e
A Alarm (CW)
A-1 Technical Summary
The alarm subsystem was a simple audible alarm that was decided upon taking into
account the need for the alarm to be heard through material and from a distance. The threshold
of pain is taken into account too so a dB level of around 90 was decided upon. A 12VDC piezo
buzzer was decided upon giving us a dB level of 87 with a slow pulsing alarm when voltage is
applied to it. The alarm receives power when the control activates the relay that completes the
circuit and sounds for the predetermined time set by the counter.
A-2 Explanation of Engineering Drawings
The alarm subsystem consists solely of the piezo buzzer and therefore there is no drawing
specific to the alarm but the power connections are noted in the power system drawing showing
positive and negative lead connections.
A-3 Cost to Implement Prototype
Table A- 1 Break down of Prototype Cost for Alarm system
A-4 Time to Implement Prototype
1 day for working with power system and control to design
1 day for obtaining alarm
1 day for constructing with other subsystems
L Locking Mechanism (CW)
L-1 Technical Summary
When the locking mechanism was first thought of many ideas were considered most of
them being in the form of a clamp that passed through the spokes of the back tire. The original
Comentarios a estos manuales