Specifications

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• Sensor Measurement- Since this device is fu nctioning as a data logger, it requires
a range of sensor measurement tasks. All measur ement tasks must be scheduled
independently; therefore a task is required by every sensor.
• Configuration Backup- System configurations must be periodically saved in a
“shadow file” to increase system fault recovery. If a fault is detected, the backup
will replace the corrupted configurations.
• Device Sleep- This task has the lowest priority and must be scheduled when no
other task is ready. It can shutsdown all parts of the device based on the current
operating requirements.
3.4 Enclosure
From the device features listed in section 3.1, the enclosure must be weather proof
and have a lock. The enclosure must be made of ABS plastic th at has UV inhibitors that
reduce the breakdown of the plastic in sunlight. It must incorporate the LCD screen, radio
antenna, removab le memory card slot, and buttons. Figure 3.3 shows a computer generated
model of the pr ototype enclosure.