Soldering Assignment

Description

The soldering assignment is a basic soldering exercise that ensures all ECE 445/ME 470 students understand how to solder surface-mount and through-hole devices. Students will be provided with the necessary PCB, components, solder, flux, etc. The details of the soldering assignment can be found in the assignment sheet.

Your end product should look similar to the following. You will create a small device that blinks an LED at varying frequencies when the button is pressed, based on a potentiometer reading.

Soldering Assignment Image

Below is a series of soldering tutorials. The critical ingredient that you need to make your life easier while surface mount soldering (and through-hole too) is flux. There is liquid, water-soluble flux available in the lab. If you can't find it or don't know what it looks like, ask a lab staff member or TA for help.

Requirements and Grading

The soldering assignment is worth 10 points and is graded via inspection by a TA or Lab Staff member. Students are allowed to make as many attempts as necessary to complete the assignment.

Submission and Deadlines

The soldered PCB must be presented to a course staff member before the deadline listed on the Course Calendar.

Video Tutorials

Below are a few public video tutorials on Soldering. There is also a text description of how to solder on the soldering assignment doc linked above.

Through-hole (THT) and surface-mount (SMD) soldering tutorial:

Tutorial on using the various types of flux:

Tutorial on using wick to remove solder:

Tutorial on using a heat gun:

Authentication System for SARS-CoV-2 Management

Jiongfan Chen, Zheyuan Zhang, Zhonghao Zhang, Pengyang Zhou

Featured Project

## MEMBERS

- Pengyang Zhou [pz6]

- Jiongfan Chen [jc47]

- Zheyuan Zhang [zheyuan5]

- Zhonghao Zhang [zz46]

## PROBLEM

Preventing SARS-CoV-2 spread requires managing access to public spaces using a phone app. Scanning QR code at the entrance is inconvenient and leads to crowding. Specifically, access control in some other places requires users to take out their mobile phones and show green or blue codes to verify their identity, which also makes users feel troublesome. How to let the user be able to pass the access control quickly is a huge problem to be solved. On the other hand, the health code observed by the human eye is easy to fabricate. How to improve security is also a big problem.

## SOLUTION OVERVIEW

We plan to design a wearable wristband for users. When passing through the access control, a corresponding RFID detection device can send identity query requests to users' wristbands from a distance, and the users' wristbands will respond to convey users' identity and health information. In addition, the wristband itself will send out a signal every few seconds to interact with other wristbands. This would help to monitor people suspected of being infected.

## SOLUTION COMPONENTS

### Wristband Subsystem:

- Broadcast the user token for other wristbands to record the passers-by.

- Receiver the request for identity from the receiver and send back the user token.

### Inspection Device at Access Control Subsystem:

- Send signals to the wristband and receive the feedback of the user identity information, through the database verification and comparison to determine the health status of the user.

## CRITERION FOR SUCCESS

- The wristband connects the inspection device and carries out information transfer successfully, and interconnects with other wristbands.

- The inspection device and database can verify the identity and health information of the user trying to enter.

- If the wristband is lost, it cannot be used by others.

- The user token is hard to be fabricated.

## DISTRIBUTION OF WORK

- Wireless communication hardware design, setup, and verification - Zhonghao Zhang (EE).

- Design and manufacture of the wristband and inspection device at access control - Jiongfan Chen (ME).

- Build the data center; Encryption and handling of data - Zheyuan Zhang & Pengyang Zhou (ECEs).