Lab

Recommended Tools

In addition to the resources that the course provides, students may find it useful to obtain the tools below:

  • wire cutter
  • wire stripper
  • needle nose pliers
  • screwdrivers
  • hex set (ball ends)
  • electrical tape
  • small scissors
  • a small file

Lab Resources

The Senior Design Lab is located at ZJUI room D225. This lab provides you access to various equipment, some spare parts, computers, and a space to work on your senior design project. In addition, course staff will make themselves available in this lab during their office hours to provide guidance on your project throughout the semester. Your weekly meetings with your TA will also likely be at this location.

It is our intention that this laboratory space provides you and your team with all the tools you would need to develop and test your project (within reason, of course!). If there is something that you require in the lab to complete your project that does not exist in the lab, talk to your TA and we will see how we can solve your issue.

Lab Rules

There are two overarching rules of working in the Senior Design Lab (and, frankly, any shared lab). First, be safe, and second, be courteous. Lab privileges will be revoked if you fail to complete the required laboratory safety training or if you break any of the lab rules. Specific points and examples of what we expect:

Breaking the rules or exhibiting bad laboratory etiquette will lead to a loss of points and/or revocation of laboratory access.

Lab Bench Reservations

We do not expect the lab to become so crowded such that finding a lab bench to work at becomes difficult. However, in the case that this does happen (particularly in semesters with very high enrollment), we will move to a Lab Bench Reservation system. Reserving a bench guarantees that spot for you, however each team may only book one lab bench at a time, and for a maximum of 4 hours per day.

If the lab needs to move to a reservation-based system, you will be notified ahead of time.

A few ground rules:

  1. You may use a lab bench (a) during a time for which you have it reserved or (b) any time during which it is not reserved in the system (on a first-come-first-served basis). However, if you are working at a bench that is unreserved and somebody reserves it using the online system, the group with the reservation gets the lab bench.
  2. There is a limit on the amount of time for which you can reserve benches in ZJUI D225. The limit is currently a total of 4 hours of total bench time in the lab per group per day (e.g., 2 hours at Bench A and 2 hours at Bench B would max out your team's reservations for the day). While this may seem restrictive, keep in mind that the course serves more than 30 groups in a typical semester and the lab has only 14 benches. Also keep in mind that you can work at a bench if it is unreserved.
  3. Some lab benches have specialized equipment at them, such as digital logic analyzers. Try to reserve the lab bench that has the equipment that you need.
  4. Cancel reservations that you will not need as soon as possible to give other groups a chance to reserve the lab bench. You can cancel a reservation up to 1 hour before time and not have it count against your daily allotment.
  5. Conflicts and/or reports of people not following these rules should be sent to your TA with the course faculty in copy.
  6. Above all, be courteous. Especially near the end of the semester, the lab will be more crowded and many teams are stressed. Clean up the lab bench when you are done with it. Start and end your sessions on time. Be patient and friendly to your peers and try to resolve conflicts professionally. If we notice empty lab benches that have been reserved, we will cancel your reservations and limit your ability to reserve lab benches in the future. Similarly, do not reserve more time than you will need. If we notice that you are frequently canceling reservations, we will limit your ability to reserve lab benches in the future. Finally, do not try to exploit the system and reserve a bench for 30 minutes every hour for eight hours. We will notice this and revoke your ability to reserve a bench.

Digital Controlled LED Rotating Display System

Guanshujie Fu, Yichi Jin, Keyi Shen, Chentai Yuan

Featured Project

# TEAM MEMBERS

Chentai Yuan (chentai2)

Guanshujie Fu (gf9)

Keyi Shen (keyis2)

Yichi Jin (yichij2)

# TITLE OF THE PROJECT

Digital Controlled LED Rotating Display System

# PROBLEM

By visual persistence phenomenon, we can display any images and strings with a rotating LED array. Many devices based on this idea have been developed. However, there are some common issues to be solved. First, the images or strings to be displayed are pre-defined and cannot be changed in a real-time way. Second, the wired connection between some components may limit the rotation behavior, and harm the quality of display. Some economical wireless communication technologies and new ways to connect components can be applied to achieve a better display and real-time image update.

# SOLUTION OVERVIEW

We aim at developing a digital controlled LED rotating display system. A servo motor is controlled to drive the stick with one row of LED to do circular rotation. The connection between LEDs, control circuit, motor and other components should be simple but firm enough to suppose good display and high-speed rotation. Moreover, there is another part to handle users’ input and communicate with the display part via Bluetooth to update images in a real-time and wireless way.

# SOLUTION COMPONENTS

## Subsystem1: Display Subsystem

- LED Array that can display specific patterns.

- Controller and other components that can timely turn the status of LEDs to form aimed patterns.

## Subsystem2: Drive Subsystem

- Servo motor that drive of the LED array to do circular rotation.

- Controller that communicates with the motor to achieve precise rotation and position control.

- An outer shell that has mechanisms to fix the motor and LED array.

## Subsystem3: Logic and Interface Subsystem

- Input peripherals like keyboard to receive users’ input.

- A FPGA board for high-level logics to handle input, give output and communicate with other subsystems.

- Wireless communication protocol like Bluetooth used in communication.

- VGA display hardware offering Graphical User Interface.

# CRITERION OF SUCCESS

- Users can successfully recognize the real-time patterns to be displayed.

- It achieves the precise rotation and position control of motor.

- The motor can drive the LED array and any necessary components to rotate stably and safely.

- The LED array is under real-time control and responds rapidly.

- The communication between components has low latency and enough bandwidth.

# DISTRIBUTION OF WORK

- Chentai Yuan(ME): Mechanisms and servo motor control.

- Guanshujie Fu(CompE): Logic and Interface design and keyboard & VGA display implementation.

- Keyi Shen(EE): Wireless communication and servo motor control.

- Yichi Jin(EE): Circuit design, keyboard & VGA display implementation.