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Group 33

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Our Group

Bradley Spencer

Electrical Engineering

Caitlin Henderson

Electrical

Engineering

Justin Wu

Computer

Engineering

Stephanny Bais

Computer

Engineering

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Currently there is no way to view and track vaginal blood loss during cesarean surgery.

The big problem in the operating room.

Caitlin Henderson (EE)

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Motivation and Background

Postpartum Hemorrhage (PPH) is excessive blood loss after childbirth
33% bleeding vaginally under the drape that goes unnoticed

Breaking sterility
Hits nurses’ feet
Approx. 30 minute delay in reaction

“How to identify vaginal blood loss in real-time?”

Stephanny Bais (CPE)

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Motivation and Background

Orlando Health’s (OH) initial solution: See-through surgical drape

Problems: �1) Lights shining on the plastic�2) Can’t visualize bleeding with differing BMI (thighs close up)�3) Inconveniently checking ever so often

Another solution: Suction pad

Placed under the patient with a wall-mounted vacuum suction to collect fluid and transport it to a suction canister for visualization and quantification

More info: https://www.bleedid.com/

Stephanny Bais (CPE)

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The Solution:

The Bleed ID Project

Caitlin Henderson (EE)

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Past Iteration

Mechanical Engineering (MAE)

Developed the mechanical aspect of the Bleed ID Canister project (e.g., stress and strain), ultimately having a patented strain gauge assembly

Justin Wu (CPE)

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Motivation and Background

Improvements wanted by OH with MAE group’s iteration because of:

Too bulky for storage and quick assembly
Issues with sanitizing

Exposed wires
Exposed buttons
External keypad
External speaker
Labels written in Sharpie

Overly complex

RaspberryPi
GUI used
Breadboard instead of a PCB

Justin Wu (CPE)

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Goals

Basic Goals - Hardware

Design custom PCB utilizing ESP32
Replace the prebuilt speaker with an internal speaker integrated with ESP32
Design Analog to digital converter outline for strain gauge data to CPU
Research and Design new power supply implementation
Research screen replacement
Research LED button size availability and cost for alarm sound pause
Refine overall function and aesthetics of the Bleed ID Monitor

Basic Goals - Software

Add ability to calibrate canister size
Verify ability to calibrate and obtain stress gauge data
Implement button functions
Trigger alarm when thresholds are reached
Display data (e.g., flow rate & total weight) with indicators
Replace and design a new UI display of the Bleed ID Monitor

Justin Wu (CPE)

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Goals

Advanced Goals

Display other data besides flow rate (e.g., total blood volume & elapsed time)
Creation of unique audio alarm to combat alarm fatigue
Reduce latency (interrupts > delays)
Test in an Orlando Health operating room
Completely comply to medical standards

5-second power test
HIPAA Memory Access

Stretch Goals

Different audio selections in the alarm system for clinician preference
Multiple UI modes for clinician preference

“Minimal”: Flow Rate & Indicator ONLY
“Graph”: RT line graph display of flow rate
“Normal”: Default (current)

Integrate with Orlando Health’s Stryker Neptune’s vacuum flow system

Justin Wu (CPE)

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Function Goals

Determine new connection method

Improve “box sitting on shelf” style
Find a secure method to connect the monitor to the boom rail

System enclosure

New design for monitor
Reduce size of monitor
Improve buttons to waterproof

Bradley Spencer (EE)

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Table of Engineering Specifications

Caitlin Henderson (EE)

Audible alarm must activate within 3 seconds of threshold

Alarm button must pause audible alert within 1 second of being pressed

Blood volume must measure within 5% accuracy

Component	Parameter	Specification	Demonstrable
Alarm Speaker	Sound Level	80-90 dB SPL	Yes
Alarm Pause Button	Functionality	Pauses Alarm Sound within < 1 second of being pressed	Yes
Display	Brightness	1000-1500 cd/m²	Yes
MCU	Sampling Frequency	1000 Hz	No
ESP32 Microprocessor	System Latency	Alarm activation < 3 seconds	Yes
Strain Gauge	Resolution	10 to 100 grams	Yes
Strain Gauge	Blood Volume Accuracy	+/- 5% accuracy	Yes
Strain Gauge	Blood Flow Rate Accuracy	+/- 5% accuracy	Yes
Entire System	Power Consumption	Energy Usage 3 to 15 Watts	No
Enclosure	Material Durability	Withstand 2000 cleaning cycles	No
Telescoping Monitor Arm	Adjustment Range	0.5-1.5m	Yes

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Hardware Comparison and Selection

Bradley Spencer

Electrical Engineering

Caitlin Henderson

Electrical

Engineering

Bradley Spencer (EE)

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Hardware Flowchart

Bradley Spencer (EE)

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Microcontroller

ESP32 allows room to expand if the client wishes

Bradley Spencer (EE)

	ESP32	RA4M1	ATmega640	MSP 430
Cost (USD)	2.50	5.96	10.28	2.50
DAC	yes	yes	no	no
Flash Memory	4 MB	256 KB	64 KB	128 KB
RAM	520 KB	256 KB	8 KB	512 b
Operating Voltage(V)	3V to 3.6V	1.6V to 5.5V	2.7V to 5.5V	1.8V to 3V
Current Draw	28 mA	154 mA	200 mA	230 µA
Power Consumption	0.1008 W	0.847 W	1.1 W	.5 mW
Speed	240 MHz	48 MHz	16 MHz	16 MHz
Processing Cores	2	1	1	1

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Linear vs Switching Regulator

Bradley Spencer (EE)

	Linear	Switching
Cost	Less expensive	More expensive
Efficiency	Less efficient	More efficient
Noise	Less noisy	Noiser
# of components	Requires few components	Requires more components

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Regulator

	MAX8815AETB+T	TPS61027DRCR	TPS63061DSCR	TPS63001DRCR	TPS564257DRLR
Min Vin (V)	1.2	0.9	2.5	1.8	3
Max Vin (V)	5.5	6.5	12	5.5	17
Output type	Adjustable	Fixed	Fixed	Fixed	Adjustable
Vout Min (V)	3.3	5	5	3.3	0.6
Vout Max(V)	5	5	5	3.3	10
Iout max (A)	1	1.5	2	1.6	4
Type	Boost	Boost	Buck-Boost	Buck-Boost	Buck
Frequency (MHz)	2	0.6	2.4	1.5	0.6
Maximum Efficiency (%)	97	96	93	96	95
Cost (USD)	5.49	2.09	2.41	2.16	0.46

Bradley Spencer (EE)

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Monitor

The Nextion display meets all of our needs and can be easily implemented

Bradley Spencer (EE)

	PIM372	ST0900I2W-RSLW-F	STM32	NX8048T070
Screen Size	8"	9"	7’’	7”
Cost (USD)	92.75	44.99	176.94	96.90
Resolution	1024 x 768	800 x 480	1024×600	800x480
Luminance (cd/m2)	350	250	1000	230
Input Voltage	5V	10.4V	12V	5V
Touch Screen	NA	NA	NA	Resistive
Communication	HDMI	I2C	RS485	UART

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Alarm Speaker

Caitlin Henderson (EE)

Attribute	Part Comparison
Part Name	CMS-15113-078SP-67	OWS-111535W50A-8	SW301008-1
Manufacturer	Same Sky (Formerly CUI Devices)	Ole Wolff Electronics Inc.	DB Unlimited
Digikey Part Number	102-5001-ND	3949-OWS-111535W50A-8-ND	2104-SW301008-1-ND
Sensitivity	91 dBSPL	99 dBSPL	95 dBSPL @10cm
Ingress Rating	IP67 - Dust Tight, Waterproof	IP67 - Dust Tight, Waterproof	IP67 - Dust Tight, Waterproof
Price (USD)	$3.17	$1.07	$3.81
Power Rated	0.7 W	1 W	1 W
Power Max	1 W	1.3 W	1.5 W
Termination	Solder Pads	Wire Leads	Wire Leads
Size [mm] (L x W x H)	15 x 11 x 3	15 x 11 x 3.5	30 x 17.5 x 3.7

DB Unlimited:

Flush Mount waterproof speaker

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Buttons Part 1 - Power Button

Caitlin Henderson (EE)

Attribute	Part Comparison
Part Name	Uxcell SPST Rocker Switch	Dorman 84824 Rocker Switch	DaierTek Rocker Switch	TIANWIDJEW Rocker Switch
Ingress Protection	Requires waterproof casing	IP54	Not IP rated but stated waterproof	IP65
On/Off Labels IEC 60417 5008 - O�IEC 60417 5007- \|	Yes	Yes	Yes	Yes
LED Indicator	No	Yes- Red	Yes - Red	Yes - Blue
Termination Style	Quick Connect	Solder Lug	Quick Connect	Quick Connect and comes with wires
Cost	$7.09	$16.63	$9.59 (For 5)	$9.99 (for 2)
Switch/Button Type	Boat Rocker Switch	Rocker Switch	Marine Round Rocker Switch	Round Rocker Switch

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Buttons Part 2 - Toggle Settings Button

Caitlin Henderson (EE)

Attribute	Part Comparison
Part Name	IAR3F1300	IPC3FAD2	PB6B2RS3M1CAL00S500
Manufacturer	APEM Inc.	APEM Inc.	TE Connectivity
Termination Style	Solder Lug	Solder Lug	Wire Leads
Actuator Type	Round, Flat	Round, Domed	Round, Domed
Contact Rating	3A at 125VAC	3A at 125VAC	0.4VA max at 20V AC/DC
IP Rating	IP67 - Dust Tight, Waterproof	IP67 (Dust Tight, Waterproof)	IP68 (Dust Tight, Waterproof, Submersible)
Pros	Waterproof and dustproof, essential for the medical environment; durable connection with solder lug termination.	Waterproof and dustproof, essential for the medical environment; durable connection with solder lug termination.	Highest waterproof rating (IP68), dustproof, wire leads simplify installation without soldering.
Cons	Solder lug requires soldering, slightly more time-consuming but secure.	Solder lug requires soldering, slightly more time-consuming but secure.	Lower power rating, may limit use in circuits requiring higher current.

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Buttons Part 3 - Alarm Button/LED

Caitlin Henderson (EE)

Attribute	Part Comparison
Part Name	SW-PB7-01LB42BFRR12VM	ULV4F2BSLL15L35	ULV4F2BSLL14L07
Display	N/A	Stop	Reset
DigiKey Part Number	2057-SW-PB7-01LB42BFRR12VM-ND	141-ULV4F2BSLL15L35-ND	141-ULV4F2BSLL14L07-ND
Manufacturer	Adam Tech	E-Switch	E-Switch
Ingress Protection	IP67- Waterproof, Dust-tight	IP67 - Waterproof, Dust-tight	IP67 - Waterproof, Dust-tight
Regulation Compliance	RoHS Compliant	cURus	cURus
Termination Style	Solder Lug	Solder Lug	Solder, Quick Connect - 0.110”
LED Functionality	Yes - Red LED	Yes - Red LED	Yes - Red LED
Price (USD)	$18.89	$14.15	$11.32

Press to stop audible alarm

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Monitor Arm

Caitlin Henderson (EE)

Attribute	Part Comparison
Part Name	Inland LDT49-C012 Monitor Arm 452425	Lisen Amazon B0BW3KB8Y4 Monitor Arm	BONTEC Rotation Monitor Arm
Manufacturer	Inland	Lisen	Bontec
Monitor Size Compatibility	17" to 32"	4” -13”	13”-34”
Weight Capacity	19.8lbs	3.2kg	6.6 -19.8lbs
VESA Compatibility	75 x 75mm, 100 x 100mm	No	75x75mm,100x100mm
Tilt Range	+40° to -40°	Not Specified	+90° to -90°
Swivel Range	+90° to -90°	Not Specified	360°
Rotation Range	+180° to -180°	Not Specified	360°
Arm Extension	18.9" (479 mm)	Not Specified	17.7’
Cable Management	Yes	No	Yes

Mounting Options	Clamp: 0.39” -3.3” Grommet: 0.39” -2.8”	Clamp: 2.83” max	Clamp: 0.39”-2.76”�Grommet: 0.39”-2.76”
Material	Powder Coated Aluminum & Steel Construction	Carbon Steel	Zinc Metal
Color Options	Silver	Black, White	Black
Price	$99.99	$29.99	$35.99

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Sensor

Caitlin Henderson (EE)

Load Cell with HX711 A/D

Attributes	Parts Comparison
Parts Name	Ultrasonic Sensor (I2CXL-MaxSonar-WR MB7040)	Load/Weight Sensor �(ALAMSCN Digital Weight Sensor)
Measurement Method	Uses sound waves to measure distance to surface of liquid	Measures the increases in weight to the canister as it fills with blood
Accuracy	±1% to ±3% of the measured distance; accuracy drops significantly for distances under 20 cm.	±0.01% to ±0.1% of the full-scale reading
Integration Location	Mounts to the canister that collects the blood. Could be mounted to a lid.	Mounts to a canister holder.
Calibration	No calibration upon startup	Some calibration required based on size of canister.
Response Time	Real-time due to auto-calibration.	Real-time measurements update as the weight of the canister increases.
Ingress Protection	Must be modified with manufacture sold addition for IP67 rating.	Not IP rated but can be modified for waterproof ability.
Power	20-30mA at 5V �150W max	5-10mA at 5V - Load Cell�<5mA at 5V - ADC�75W max
Cost	$99.95 without waterproofing $179.95 with IP waterproofing	$7.99 including HX711 ADC

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Overall Schematic

Bradley Spencer (EE)

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Bradley Spencer (EE)

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Bradley Spencer (EE)

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Bradley Spencer (EE)

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Bradley Spencer (EE)

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Software Comparison and Selection

Justin Wu

Computer

Engineering

Stephanny Bais

Computer

Engineering

Stephanny Bais (CPE)

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IDE Comparison & Selection

Why Arduino IDE?

Easy to use; allows for quick programming
Familiarity
Extensive library availability
Compatible with ESP32, HX711 sensor, Nextion Monitor

Stephanny Bais (CPE)

Features	Arduino IDE	VSCode with �PlatformIO
Complexity	Beginner-friendly (simplified programming)	Intermediate to Advanced, can choose to work with Arduino or ESP-IDF framework
Supported Languages	Arduino C++	C/C++
Library Availability	Extensive Arduino libraries	Supports both Arduino and ESP-IDF libraries (and other native libraries for different platforms)
Board Compatibility	Very broad, including Arduino dev boards, ESP series, STM32 Series and more	Very broad, including both Arduino dev boards, ESP Series, STM32 series and more

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Programming Language Comparison & Selection

Why Arduino C++?

Familiarity
Arduino IDE supported language
Compatible with ESP32
Compatible with Nextion Monitor
Hardware Control

	C	C++	Arduino C++	Rust
Complexity	High Complexity	High Complexity	Less Complex	High Complexity
Real-Time System Suitability & Control Over Hardware	Great	Great	Great	Great
Team Familiarity	High	Some	High	None

Stephanny Bais (CPE)

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Communication Protocols Comparison & Selection

Why UART & I2C?

UART (Monitor)

Simplicity
Only 2 pins needed
No need for high-speed & dedicated clock signal

I2C (Sensor)

Required by HX711 Sensor
Less wires/pins required compared to SPI
Allows for multiple devices if needed in the future

	UART	SPI	I2C
Protocol Type	Asynchronous	Synchronous	Synchronous
Number of Wires	2 (TX, RX)	4 (MOSI, MISO, SCK, CS)	2 (SDA, SCL)
Data Rate	Low (< 1 Mbps)	High (>=10 Mbps)	Moderate (<1 Mbps)
Complexity	Simple (requires pre-set baud rate; minimal error-checking)	More Complex (device increases = complexity increases)	Simple (Chaining multiple devices is easy)
Drawbacks	Limited in range, speed, and multi-device support	Requires more wiring, interference	Delays, limited data rate, bus contention
Ideal Use	Simple, P2P Communication	High-speed data transfer between multiple devices	Communication with multiple devices

Stephanny Bais (CPE)

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Software Flowchart

The following software flowchart outlines the main processes of the 4 sections of our programming:

Setup/Calibration
Data Display
Alarm System
Monitor/Buttons

Justin Wu (CPE)

Now here we have our software flowchart which gives a basic overview of our programming’s processes and workflow. There are 4 main sections in our current code, the first being the initial set-up of the system, where upon start-up the strain gauge is tared to 0. The user is then prompted to add a known weight, as the HX711 sensor will require it in order to properly calibrate the weight factor. Once this is complete and the weight is removed, the user is then prompted to enter the container size, which will vary depending on what container is attached.

With the set-up complete, we go into the main loop of our programming, which consists of constantly taking in the sensor data every 2 secs and then calculating the blood weight volume and average flow rate. If the blood volume passes a certain threshold or the average flow rate is at a dangerous level, the alarm system will trigger, playing audio and flashing lights to alert the clinicians and prompting them to intervene if necessary. This alarm system will then require the users to deactivate it to continue the main process. In addition, the user will be able to press a variety of buttons during the main process to interface with the system, such as pausing, clearing, and even stopping the programming.

This is all subject to change depending on the desires of Orlando Health as well as any improvements discovered by the team.

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Use Case Diagram

The interactions between the actors and software system are illustrated by the following:

User: Clinicians
Strain Gauge: The sensor used for obtaining data and calculations
Monitor: The display showcasing all data and changes

Justin Wu (CPE)

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State Diagram

Displayed to the right are the possible states that the entire system are subject to.

These states can be easily categorized under two types:

States for initial preparations/set-up
States that cause display changes to the monitor

Justin Wu (CPE)

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Class Diagram

On the right shows how we structured our program.

Some parts are tentative to change because:

What data to display is still in discussion
Class diagram includes stretch goals (e.g., option to choose audio for alarm system)

Stephanny Bais (CPE)

On the right is our class diagram.

Arduino doesn’t use classes in a traditional sense, so our class diagram is more of a conceptual representation

that shows how our data is set up and how our code is organized.

The diagram is divided into 6 main sections:

Canister Class:

The canister class handles the canister’s calibration process and threshold management.

Sensor Class:

The Sensor class is responsible for receiving and processing data from the sensor.

Alarm System Class:

The Alarm System class monitors thresholds and triggers an alarm when necessary.

Button Functionalities Class:

The Button Functionalities class defines the behavior of the buttons.

Monitor Display Class:

The Monitor Display class controls what’s displayed on the monitor, constantly updating relevant data in real time.

Integration Class:

Lastly, the Integration class ties all other classes, handling the flow of data.

Some parts are tentative to change as we have yet to solidify data display. Also, this class diagram includes stretch goals that we may or may not be able to implement, such as having multiple display or UI modes to choose from.

��

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Audio Alarm: Three Stages

Stage 1 (Initial Alert, 0-15 secs):

Set lower frequency with oscillating volume
Alert clinicians without sudden jumpscare

Stage 2 (Persistent Warning, 15-30 secs):

Volume set at loud magnitude, additional alert sound included
Begin to urge clinicians to deal alarm system

Stage 3 (Emergency Siren, >30 secs):

Cacophony of loud buzzer and high pitched sounds, volume set to max
Persuasion of acknowledgement through pure annoyance

Prototype Audio Files Created
Heavily Subject to Change

Justin Wu (CPE)

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UI

Stephanny Bais (CPE)

(Above) Sample Prompt�(Right) Monitor UI Concept, subject to change

Shown here are two sample UIs.

When the monitor is turned on, prompts will show to tare weight and to calibrate the canister.

For instance, on the left is a sample prompt the user interacts with when choosing a canister size.

After, the screen on the right will show, updating the values at a rate as needed by our client.

The image on the right is our monitor UI concept, and it’s subject to change.

As a customer requirement, our main goal for our UI is to make the flow rate & flow rate indicator obvious.

Since there are already plenty of existing devices in operating rooms, the data displayed on the monitor must easily be understood by clinicians “at a glance”.

As shown, the red upward-pointing arrow indicates a flow rate that is considered dangerous, this value being determined by our client. Coupled with this indicator is an audio alarm that must be ACK by a clinician. The number on its right is the flow rate (or FR) measured in mL/s. When the flow rate is normal, a green horizontal line will show instead of a red arrow, and everything shown in red will be green as well.��Just below the flow rate is the value of the total volume (or TV) measured in mL.

The number in purple below this is the elapsed time (or ET) of the procedure.

Finally, the bottom right number in blue is the canister size (or CS) chosen in the beginning of the procedure.

Again, this design is subject to change since it’s still under progress.

For example, the displayed data must be finalized and the UI approved by Orlando Health.

Additionally, we would like to implement loading indicators to provide visual feedback during processing.

As a stretch goal, we would like to add a waveform for the flow rate as another visual indicator.

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CAD Modeling - System Enclosure

Caitlin Henderson (EE)

The system enclosure will house the monitor screen, buttons, and all electrical components aside from the load cell.

Pictured

Top button - Power On/Off
Bottom Left button - ALARM STOP
4 bottom buttons - Toggle buttons

Not Pictured

Back of case will allow for power cord
Back of case will allow for corded connection to load cell
Back of case will house the flush mounted speaker
Back of case may also require waterproof vents in case of internal heat build up

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Prototyping and Testing - Hardware

Bradley Spencer (EE)

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Prototyping and Testing - Software

Stephanny Bais (CPE)

To test our code, we assembled our components as shown in the image on the left.

The canister is attached to the load cell. Attached to the load cell is the strain gauge also containing the sensor.

This was connected to our breadboard as shown on the bottom right image. Also attached to our breadboard is the monitor.

On our breadboard, we have buttons to test button functionalities. Each button has a designated function. For instance, the ‘pause’ button should temporarily halt tracking, and pressing it again should resume tracking.

Our breadboard also includes a buzzer as a placeholder for our speaker. The purpose of this is to ensure that the buzzer activates when thresholds are reached (which would occur at every 500mL increment).

These were initially tested through the serial monitor.

To test sensor readings, known weights were placed in the canister, and the displayed values were compared to the expected readings in the serial monitor.

To test the monitor, we added a preset number in the Nextion Editor, and the code must update it to a different number.

Both tests were done successfully.

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Prototyping and Testing - Difficulties & Successes (HW)

Difficulties

The ESP32 function indicator LED was connected to an input only pin
First iteration of voltage regulators malfunctioned due to frequency mismatch
Barrel Jack port was reversed and had to be mounted upside down

Successes

ESP32 was able to be successfully flashed on the first attempt
All peripheral pins were fully functional

Bradley Spencer (EE)

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Prototyping and Testing - Difficulties & Successes (SW)

Difficulties

Obtaining data from sensor
Familiarizing ourselves with the Nextion Editor (UI)
UART communication with monitor
Getting audio from frequency and files to the speaker

Successes

Calibration of canister size & strain gauge
Triggering of the alarm system
Implementing button functions & thresholds
Display of data

flow rate
current weight
Error handling (print statements)

Basic display to the LCD monitor

Initial setup

Serial communication with serial monitor and monitor display

Justin Wu (CPE)

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Administrative Content - Work Distribution

Bradley Spencer	Schematic & Design for PCB, Schematic & Design for Regulators, Power Supply Implementation, Monitor Research, PCB & Regulator Testing




Caitlin Henderson	Project Manager, Button Research & Testing, Sensor Assembly, Speaker Research & Implementation, PCB & Regulator Testing. CAD Modeling




Justin Wu	Audio Implementation, Programming (Alarm, Assist with Data Reading & Logic, Error Handling, Delays/Interrupts), Assist with PCB & Regulator Testing, Prototyping (Debugging & Testing)




Stephanny Bais	Visual Implementation (Monitor, UI), Programming (Data Reading & Logic, Button Functionalities, Error Handling, Delays/Interrupts ), Prototyping (Debugging & Testing)

Stephanny Bais (CPE)

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Administrative Content - Budget

Component	Est. Cost ($)	Budget ($)	Quantity needed for testing and Use
Arm	50.00	200.00	1
Electrical Components	60.77	100.00	1
Strain Gauge	09.00	10.00	4
Speaker	03.00	10.00	3
Screen	96.90	250.00	1
Buttons	50.00	50.00	12
Power cable	08.95	50.00	1
PCB	64.77	200.00	1
Total	343.39	870.00	24

Caitlin Henderson (EE)

Orlando Health is the sponsor for our project. We did aim to keep the device as low cost but high quality as possible.

Components such as buttons and speakers were ordered in sets of 3 or 4 to allow for testing and possible faulty parts.

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Progress and Plan for Completion

Completion

For completion, we will finalize what data to display and approval of our UI, audio, button functionalities, and enclosure from our stakeholder for our Midterm Demo.

Software

The functions for buttons, data reading, and calculations work along with a basic UI. We need to improve error handling, complete the alarm system and integrate it with our current code, as well as to optimize our code to reduce latency and improve readability. Also, additional data may be implemented and displayed, which ultimately depends on stakeholder needs.�

Prototype & Testing

We have been prototyping and testing since November. The current hardware and software integration are working successfully. Our testing revealed rework needed to be done with our PCB, which was expected.

Hardware

The voltage regulators are currently being completely redesigned and will be ordered soon. The main PCB is fully functional, but has undergone revisions to optimize size and layout.

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Stephanny Bais (CPE)

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Thank You!