BetaDelta

Overview

The purpose of BetaDelta is to provide real-time updates on the availability of a given study room. The information will be uploaded to a website, developed through Amazon Web Services, based on input from the BetaDelta device. The goal for the BetaDelta device is to detect occupancy via motion sensor, connected to a raspberry pi, and encased in a 3D printed shell.

Team Members

• James Tiffany
• Rebecca Smith
• Nial Alwash
• Nathan Schmetter (TA)

Objectives

Device

• Constructed with a raspberry pi and motion sensor
• Encased in a 3D printed shell
• Contain python code capable of processing input from the motion detector

Website

• Developed with Amazon Web Services
• Have the to display updated room occupancy via wifi
• Change colors based on occupancy (red for occupied, green for available)

Challenges

• Learn Python coding techniques
• Learn how to use CAD and 3D print
• Recreate circuit tutorials for motions sensor to raspberry pi connection
• Create our own framework for the server and website using Amazon Web Services

Budget

Item	Quantity	Price	Vendor	Link
Raspberry Pi	1	$0	Lab
Micro SD Card (8GB)	1	$9.95 + $7.14(Adafruit shipping) = $17.09	Adafruit	https://www.adafruit.com/products/3259
Light (LDR) Sensor	1	$6.95	Adafruit	https://www.adafruit.com/product/1980
1uF Capacitor	2	$11.98	Uxcell	http://www.uxcell.com/1uf-50v-105c-radial-electrolytic-capacitor-5x11mm-p-162619.html
Motion sensor	1	$9.95	Adafruit	https://www.adafruit.com/product/189
Sound detector	1	$6.95	Adafruit	https://www.adafruit.com/products/1063
Breadboard Wires	1	$7.29	Amazon	http://www.amazon.com/Solderless-Flexible-Breadboard-Jumper-Wires/dp/B005TZJ0AM
4 Digit Display	1	$11.95	Adafruit	https://www.adafruit.com/products/881
Perfboard	1	$12.50	Adafruit	https://www.adafruit.com/product/571
Noise Canceling Foam Panels	1	$29.95 + $12.68 = $42.63	ATS Acoustics	https://www.atsacoustics.com/foam-wedge-acoustic-panels-12charcoalblue.html?d=GPGEN01&kw=1275-FW12-ChBl&gclid=CjwKEAiAi-_FBRCZyPm_14CjoyASJAClUigOOMzNOCQuiDdpuEa-mnZzNmtAIb-ONqLhZf-7JBGokhoCHY7w_wcB
Website	For 3 months	$2.99(X3) = $8.97	WordPress	https://wordpress.com/#plans
Total		$136.56

Gantt Chart

Engineered Solutions

3D Printing

First, we created a model of our design in CAD. Next, we printed a scaled-down version to see if the printer could handle its shape and intricacies. Then we printed our first to-scale version, and soon after printed our final version.

Evolution of 3D Models

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Circuitry and Code

We found a tutorial online for how to connect the motion sensor to the raspberry pi, completed the circuit, and then edited a version of code we found online using a counter technique to accept input from the sensor.

Data Upload

We developed entirely our own framework, using bits and pieces from tens of tutorials. Our code was two-pronged, including a first set that interpreted the input from the motion sensor and raspberry pi, and a second set that handled the upload of data, display, and communication between our server and database.

Repository

• Beta Delta Repository

our final poster