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Project II: Research on Locking Mechanism and Power Supply Design

This document outlines the findings from Project II, focusing on the locking mechanism and power supply requirements. It includes a comprehensive analysis of different power supply designs with block diagrams. Highlights include a comparative study on battery choices, emphasizing capacity, output current, and cost-effectiveness. The use of voltage dividers and step-up boosters is examined for efficient power management. Additionally, discussions on motor-controlled locking mechanisms present the pros and cons of various designs, culminating in a detailed parts list for implementation.

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Project II: Research on Locking Mechanism and Power Supply Design

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  1. ECEN 4013 Project II Research Locking Mechanism & Power Supply

  2. Table of Power Requirements

  3. Level 2 Block Diagram - Power

  4. Level 2 Alt. Block Diagram - Power

  5. Alt. Power Block Explained • Larger Battery: Several aspects of this battery were very nice; it had a large capacity, large output current, and AC charging. I ultimately decided, though, that the change in cost ~$50 wasn’t worth the unneeded difference. • Voltage Dividers: Using resistive voltage dividers to step down the voltage (5 to 3.3 and 27 to 24 & 12) dissipated power unnecessarily, even though it would have been simpler. Regulators do a better job of stepping down voltage. • Using the step-up booster allowed us to run everything off of the single 5V supply, eliminating the need to use the 9V batteries. This also simplifies recharging and maintenance.

  6. Level 2 Block Diagram - Lock

  7. Level 2 Alt. Lock Block Diagram

  8. Alt. Lock Block Explained • I could have used a 1.5-3.0 V hobby motor instead of the maglock. The benefit would have been the lower voltage requirement, but I would have had to construct a locking mechanism from scratch for the gear on the motor to control. The code for implementing the motor-controlled lock would also have been far more complicated than simply turning a transistor on and off.

  9. Lock Simulation On

  10. Lock Simulation Off

  11. Parts List

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