Project

# Title Team Members TA Documents Sponsor
74 Isolated Voltage Sensor
 Jevin Liu
Laureano Salcines Cubria
 Hanyin Shao design_document1.pdf
final_paper1.pdf
other1.pdf
photo1.png
photo2.png
presentation1.pptx
proposal1.pdf
video
Isolated Voltage Sensor

Team Members:
- Laureano Salcines (Ls38)
- Jevin Liu (jevinl2)
- Student 3 (netid)

# Problem

In power electronics, there is a need to sense a voltage through galvanic isolation. In these applications, the output measurements must be accurate and be represented digitally.

# Solution

Our solution is a small board that can be mounted onto another larger PCB, this small board will carry an analog front end, analog to digital converter, isolated digital interface, a microcontroller and a power supply.

measure a voltage across an isolated barrier, provide the measurement as a floating point number.

# Solution Components

Analog front end

Analog to digital converter with voltage reference.

isolated digital interface

microcontroller

## Analog front end.

Sense the input voltage and provides a signal to the analog-to-digital converter. TL-072 amplifier.

## Voltage reference and digital converter.

Provide a voltage reference and sample the input voltage. The voltage reference can be a series voltage reference REF 35.

## Microcontroller and isolated digital interface.

An ATMEGA328P microcontroller which does the sampling at 10 kilo sample per second.

Power.

A PDS1-S5-S15 Isolated power converter that can transfer power across from the microcontroller side to the ADC

# Criterion For Success

10 kilo-samples per second microcontroller, should measure the voltage digitally within 0.5 percent precision, and at least 10 megaohms of impedance.

Recovery-Monitoring Knee Brace

Dong Hyun Lee, Jong Yoon Lee, Dennis Ryu

Featured Project

Problem:

Thanks to modern technology, it is easy to encounter a wide variety of wearable fitness devices such as Fitbit and Apple Watch in the market. Such devices are designed for average consumers who wish to track their lifestyle by counting steps or measuring heartbeats. However, it is rare to find a product for the actual patients who require both the real-time monitoring of a wearable device and the hard protection of a brace.

Personally, one of our teammates ruptured his front knee ACL and received reconstruction surgery a few years ago. After ACL surgery, it is common to wear a knee brace for about two to three months for protection from outside impacts, fast recovery, and restriction of movement. For a patient who is situated in rehabilitation after surgery, knee protection is an imperative recovery stage, but is often overlooked. One cannot deny that such a brace is also cumbersome to put on in the first place.

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Solution:

Our group aims to make a wearable device for people who require a knee brace by adding a health monitoring system onto an existing knee brace. The fundamental purpose is to protect the knee, but by adding a monitoring system we want to provide data and a platform for both doctor and patients so they can easily check the current status/progress of the injury.

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Audience:

1) Average person with leg problems

2) Athletes with leg injuries

3) Elderly people with discomforts

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Equipment:

Temperature sensors : perhaps in the form of electrodes, they will be used to measure the temperature of the swelling of the knee, which will indicate if recovery is going smoothly.

Pressure sensors : they will be calibrated such that a certain threshold of force must be applied by the brace to the leg. A snug fit is required for the brace to fulfill its job.

EMG circuit : we plan on constructing an EMG circuit based on op-amps, resistors, and capacitors. This will be the circuit that is intended for doctors, as it will detect muscle movement.

Development board: our main board will transmit the data from each of the sensors to a mobile interface via. Bluetooth. The user will be notified when the pressure sensors are not tight enough. For our purposes, the battery on the development will suffice, and we will not need additional dry cells.

The data will be transmitted to a mobile system, where it would also remind the user to wear the brace if taken off. To make sure the brace has a secure enough fit, pressure sensors will be calibrated to determine accordingly. We want to emphasize the hardware circuits that will be supplemented onto the leg brace.

We want to emphasize on the hardware circuit portion this brace contains. We have tested the temperature and pressure resistors on a breadboard by soldering them to resistors, and confirmed they work as intended by checking with a multimeter.

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