Project

# Title Team Members TA Documents Sponsor
52 LED Sphere Display
 Ashley Saju
David Heydinger
Stephanie Eze
 Shiyuan Duan final_paper2.docx
proposal1.pdf
 LabEscape POV
# LED Globe Display
Team Members:
- Ashley Saju(asaju2)
- David Heydinger (ddh3)
- Stephanie Eze (oeze2)
# Problem
For LabEscape, an escape room under Prof. Kwait, a unique LED display would be beneficial to the escape room experience. A spinning LED display should be able to show a timer count down and wirelessly show any image.
# Solution
We will design a curved LED strip to be mounted on a rotating platform that spins at a constant speed. Through a Bluetooth enabled app, we can upload images and text to the image display system for storage and playback. These images will be displayed using persistence of vision by precisely controlling LED light timing based on the angular position and speed of the platform. The position and speed of the platform will be measured by an Hall sensor that detects each revolution of the rotating system, allowing the system to accurately determine when to display certain LED lights.
# Solution Components
## Image Displaying System (Microcontroller, Memory, and LEDs)
This system handles the process of receiving the image wirelessly or taking a sprite from memory and lighting the LED appropriately. An SD card would be used to store sprites of numbers for the timer mode. Shift registers would be used to achieve a speedy parallel output to the LED. And the LEDs would be receiving a preset voltage at first then varying voltages if time allows for different colors. The potentiometer can be used to adjust LED color.
RP2040 microcontroller
Micro SD card > 16kB memory
24-bit Shift registers: STP24DP05 24-bit constant current LED sink driver with output error detection
RGB LEDs: Strawhat LED 4.8mm RGB (4-Pin) WEDRGB03-CM
10kOhm Potentiometer with knob
Resistors
## Wireless Control
The ESP32 hosts a web application that is accessible by entering the device’s IP address into a web browser. This web application allows a user to upload text or an image, which are processed by the ESP32 into a display-ready format. The processed data is then transmitted directly from the ESP32 to the spherical display system for rendering. The initial implementation supports monochrome bitmap images, with plans to extend to multi-color images in future revisions.
ESP32-WROVER-B
## Power System
Delivering power to the stationary motor will be provided by AAA batteries. However, delivering power to the spinning component is more difficult due to the potential for wires to be tangled. To solve this, we will drive power to the rotating platform using a slip ring, allowing for 360 degree rotation without twisting any electrical connections.
Components:
AAA battery pack [MIKROE-5351]
Power Switch [GSW-18]
Slip Ring [ADAFRUIT1196]
DC motor [CN-PA22-201213500-G429]
Voltage Regulator (buck converter)

## Spinning PCB - angular speed measurement
The spinning PCB will include a Hall effect sensor that will detect exactly when one full turn of the PCB has been completed. It will send the measurements to the microprocessor which will calculate the angular speed of the spinning PCB based on the time interval between measurements.
Components:
Hall effect sensor [US5881LUA]
Voltage Regulator [MIC5219-3.3]
Small Magnet [07045HD]

# Criterion For Success
Describe high-level goals that your project needs to achieve to be effective. These goals need to be clearly testable and not subjective.
When operating at full speed, the displayed text and image should be clearly legible from 5 feet away over a period of 10 minutes.
The rotating assembly remains balanced while operating, with no audible thumping exceeding 50 dB or visible oscillation for the duration of 10 minutes.
The LED Globe successfully receives and displays image and text uploads within 1 minute per image, without requiring any physical connections.
A Hall effect sensor accurately detects when the rotating assembly has completed one revolution, with less than 2% missed detections over 10 minutes.
LED brightness is sufficient to display images and text from 5 feet away under standard indoor lighting (300 lux).
Timer mode: Timer can be set to a time up to 1 hour in the web application and counts down, resets, and pauses via web application..

Modularized Electronic Locker

Jack Davis, Joshua Nolan, Jake Pu

Modularized Electronic Locker

Featured Project

Group Member: Jianhao (Jake) Pu [jpu3], Joshua Nolan [jtnolan2], John (Jack) Davis [johnhd4]

Problem:

Students living off campus without a packaging station are affected by stolen packages all the time. As a result of privacy concerns and inconsistent deployment, public cameras in Champaign and around the world cannot always be relied upon. Therefore, it can be very difficult for victims to gather evidence for a police report. Most of the time, the value of stolen items is small and they are usually compensated by the sellers (Amazon and Apple are very understanding). However, not all deliveries are insured and many people are suffering from stolen food deliveries during the COVID-19 crisis. We need a low-cost solution that can protect deliveries from all vendors.

Solution Overview:

Our solution is similar to Amazon Hub Apartment Locker and Luxer One. Like these services, our product will securely enclose the package until the owners claim the contents inside. The owner of the contents can claim it using a phone number or a unique user identification code generated and managed by a cloud service.

The first difference we want to make from these competitors is cost. According to an article, the cost of a single locker is from $6000 - $20000. We want to minimize such costs so that we can replace the traditional mailbox. We talked to a Chinese manufacturer and got a hardware quote of $3000. We can squeeze this cost if we just design our own control module on ESP32 microcontrollers.

The second difference we want to make is modularity. We will have a sensor module, a control module, a power module and any number of storage units for hardware. We want to make standardized storage units that can be stacked into any configuration, and these storage units can be connected to a control module through a communication bus. The control module houses the hardware to open or close all of the individual lockers. A household can purchase a single locker and a control module just for one family while apartment buildings can stack them into the lockers we see at Amazon Hub. I think the hardware connection will be a challenge but it will be very effective at lowering the cost once we can massively manufacture these unit lockers.

Solution Components:

Storage Unit

Basic units that provide a locker feature. Each storage unit will have a cheap microcontroller to work as a slave on the communication bus and control its electronic lock (12V 36W). It has four connectors on top, bottom, left, and right sides for stackable configuration.

Control Unit

Should have the same dimension as one of the storage units so that it could be stacked with them. Houses ESP32 microcontroller to run control logics on all storage units and uses the built-in WiFi to upload data to a cloud server. If sensor units are detected, it should activate more security features accordingly.

Power Unit

Power from the wall or from a backup battery power supply and the associated controls to deliver power to the system. Able to sustain high current in a short time (36W for each electronic lock). It should also have protection against overvoltage and overcurrent.

Sensor Modules

Sensors such as cameras, motion sensors, and gyroscopes will parlay any scandalous activities to the control unit and will be able to capture a photo to report to authorities. Sensors will also have modularity for increased security capabilities.

Cloud Support

Runs a database that keeps user identification information and the security images. Pushes notification to end-users.

Criterion for Success:

Deliverers (Fedex, Amazon, Uber Eats, etc.) are able to open the locker using a touchscreen and a use- provided code to place their package inside. Once the package is inside of the locker, a message will be sent to the locker owner that their delivery has arrived. Locker owners are able to open the locker using a touchscreen interface. Owners are also able to change the passcode at any time for security reasons. The locker must be difficult to break into and offer theft protection after multiple incorrect password attempts.

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