Introduction
In this project, which is a stop sign tracking system, we need to design an event-trigger tracking system which can send out alerts when the stop sign is tilted. So we need to have sensors and a communication system. In order to connect those two parts together, we also need a good microcontroller. Besides, a power supply is necessary to support all of those three parts. In this project, we have to think about the price of each part because the cost efficiency for stop signs is important. Additionally, we must consider carefully about the operating temperature because the whole system will work outside. The remaining things are the integration of those components and the embedded system.
Functional Requirements
1.Tilt threshold: Once the sign tilt becomes greater than ±15 degrees, an alert should be sent out.
2. Send Alerts: Alerts should be event driven and only a message is sent out if an event occurs. Events are something that is being monitored that will render the sign non-functional or an incoming request for information from the user. The sensors should specifically figure out what rendered the STOP sign non-functional
3. Wireless Communication: Communication to mobile devices should be wireless to keep cost low and easy to use.
4. Self-Calibrate: System should calibrate itself to reduce maintenance and installation time.
5. False-Positives: 10% of alerts can be false-positive alerts (alert sent out that sign broke constraints but constraints weren't actually broken).
6. False-Negatives: No false-negatives are allowed ( No alert sent out even though constraints were broken).
7. Power Supply: System (the battery) should be supplied 5V. Some of which will be used to directly supply system and the rest to be used to charge a rechargeable battery.
8. Tracking: Should be able to locate the sign from the signal.
2. Send Alerts: Alerts should be event driven and only a message is sent out if an event occurs. Events are something that is being monitored that will render the sign non-functional or an incoming request for information from the user. The sensors should specifically figure out what rendered the STOP sign non-functional
3. Wireless Communication: Communication to mobile devices should be wireless to keep cost low and easy to use.
4. Self-Calibrate: System should calibrate itself to reduce maintenance and installation time.
5. False-Positives: 10% of alerts can be false-positive alerts (alert sent out that sign broke constraints but constraints weren't actually broken).
6. False-Negatives: No false-negatives are allowed ( No alert sent out even though constraints were broken).
7. Power Supply: System (the battery) should be supplied 5V. Some of which will be used to directly supply system and the rest to be used to charge a rechargeable battery.
8. Tracking: Should be able to locate the sign from the signal.
Non Functional Requirements
1. Size: The package shouldn't be larger than 20% of the hardware being used.
2. Package: The system should be packaged within NEMA enclosure that is weather resistant.
3. Weather Resistant: The package should operate in through
-temperatures from -30 F to 120 F;
-water-proof (rain, snow, fog…);
-wind resistant: should stay attached to sign under strong wind (~30MPH).
4. Cost-effective: The price for the package should be no more than $155.
5. Easy to Install: Installation onto stop sign should be no more than 10 minutes.
6. Lifetime: System should be able to sustain itself for 10 years.
2. Package: The system should be packaged within NEMA enclosure that is weather resistant.
3. Weather Resistant: The package should operate in through
-temperatures from -30 F to 120 F;
-water-proof (rain, snow, fog…);
-wind resistant: should stay attached to sign under strong wind (~30MPH).
4. Cost-effective: The price for the package should be no more than $155.
5. Easy to Install: Installation onto stop sign should be no more than 10 minutes.
6. Lifetime: System should be able to sustain itself for 10 years.