Overview
powerpoint, report, circuit design, and simulation
1. Research and Problem Identification
● Explain why posture monitoring is important (e.g., for preventing back pain or improving
ergonomics).
● Identify the gap this device addresses (e.g., lack of affordable or simple wearable
posture monitors).
2. System Design
● Break down the system into subblocks:
1. Strain Gauge Sensor:
■ Simulate or assume changes in resistance as the strain gauge
stretches/compresses.
■ Model the strain gauge as a variable resistor in LTSpice for simulation.
2. Wheatstone Bridge:
■ Convert the resistance changes into a small voltage signal.
■ Ensure the bridge is balanced when no strain is applied.
3. Amplification Circuit:
■ Use an instrumentation amplifier to boost the Wheatstone bridge output to
a readable level.
4. Output Display:
■ Decide how the output will be displayed (e.g., a basic voltage reading or a
trigger for an alert).
● Use datasheet specifications to choose components for the bridge and amplifier
(resistors, op-amps).
3. Simulation in LTSpice
● Simulate each circuit block:
1. Wheatstone bridge with a variable resistor representing the strain gauge.
2. Amplification circuit (e.g., with an LM358 op-amp or INA128 instrumentation
amplifier).
3. Full system to verify how changes in resistance translate to voltage output.
● If you’re unfamiliar with LTSpice, I can help you set up these simulations step-by-step.
4. Abstract
● Write a half-page abstract summarizing the project:
○ Group name and members.
○ Purpose of the project.
○ High-level overview of the system.
5. Presentation
● Prepare a 10-minute presentation:
○ Define the problem and solution.
○ Explain each circuit block, with simulations for the Wheatstone bridge and
amplifier.
○ Discuss practical applications of the back brace.
6. Final Report
● Use the IEEE Transactions on Biomedical Engineering template for formatting.
● Include:
1. Problem statement and motivation.
2. System design and simulation results.
3. Discussion on potential real-world implementation, limitations, and
improvements.
4. Each member’s contribution.