1. Load Monitoring For Fleet Vehicles Dan Hanns Anant Agarwal ECE 445 Senior Design Project

2. The Problem Not suited for light vehicles Current Solutions => Expensive Difficult installation

3. Proposed Solution Suspension Compression Cheap and Universal; SONAR

4. Mechanical Equations

5. Power Supply Design Car Electrical System = 7-15 Volts Electronics require 5 Volts Buck Converter Output: 5V ± 250mV, 2A maximum

6. Diodes Incorporated AP6502 Buck converter IC Few external parts required Adjustable Output Voltage 2A overcurrent protection

7. Major Equations from Design

8. Power Supply Schematic

9. Long Sensor Wires = Noise Solution: Add Filter Capacitor RC Filtering

10. MicroController Particle Photon STM32F205 120Mhz ARM Cortex M3 >4 Digital pins, 1 Serial pin Broadcom BCM43362 Wi-Fi chip More than Sufficient; Already in hand

11. Screen Nextion HMI LCD 3.2” Touchscreen Tx/Rx interface “Easy” Design Software

12. Sensors Maxbotix HRLV EZ0 Pulse In Pulse width +/-1% 1mm/μs Minimum 30cm 30-50cm +/-5mm

13. Average Mode – not enough readings Median (used) Filtering values

14. Readings Reduced Max height to 450mm 0 12 3

15. Layout Considerations Same size as screen Single side = Simple Passives close to IC Adaptability

16. Complete Prototype

17. Vehicle Test Structure Simulates Truck Chassis Mobile Easily Modified Front k = 4.8lbs/mm Rear k = 3.5lbs/mm

18. Vehicle Test Structure

19. Results

20. More Results

21. Sometimes Not so Great…

22. Conclusions

23. Questions????

24. Replies from Maxbotix