P13625: Air Quality Monitor
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Detailed Design

Table of Contents

Pre-Design Activities

Specification Table

Drawings, Models

Electrical

image:/public/CAD Models/Monitor Components/Electronic Components/CO Sensor DWG.JPG image:/public/CAD Models/Monitor Components/Electronic Components/PM Sensor DWG.JPG image:/public/CAD Models/Monitor Components/Electronic Components/TempHumiditySensor DWG.JPG image:/public/CAD Models/Monitor Components/Electronic Components/PCB Board DWG.JPG

Mechanical

image:/public/CAD Models/Monitor Components/Case Components/PVC Conduit Box DWG.JPG image:/public/CAD%20Models/Monitor%20Components/Case%20Components/PVC%20Box%20Cover%20DWG.JPG image:/public/CAD%20Models/Monitor%20Components/Case%20Components/Acrylic%20Sensor%20Divider.JPG?rev=0 image:/public/CAD%20Models/Monitor%20Components/Case%20Components/Acrylic%20Divider%20flat%20UI%20Plate.JPG image:/public/CAD%20Models/Monitor%20Components/Case%20Components/User%20Interface%20Plate.JPG?rev=0

Assembly

image:/public/CAD Models/Monitor Components/Case Components/Monitor Assembly DWG.JPG image:/public/CAD Models/Monitor Components/Case Components/Monitor Exploded Assembly.JPG

Engineering Analysis

Electrical

public/ELEC-PIC/Ramp Voltage to zener 3.3 Circuit.png public/ELEC-PIC/Ramp Voltage to zener 3.3 simulation Circuit.png public/ELEC-PIC/Ramp Voltage to zener 3.3 Label.png
Ramp Voltage to Zener 3.3v Circuit Ramp Voltage to Zener 3.3v Simulation Circuit Ramp Voltage to Zener 3.3v Label
Circuit

Circuit

public/ELEC-PIC/Ramp Voltage to zener 5v Circuit.png public/ELEC-PIC/Ramp Voltage to zener 5v simulation Circuit.png public/ELEC-PIC/Ramp Voltage to zener 5 v Label.png
Ramp Voltage to Zener 5v Circuit Ramp Voltage to Zener 5v Simulation Circuit Ramp Voltage to Zener 5v Label
Ramp Voltage to Zener 5v Simulation

Ramp Voltage to Zener 5v Simulation


Voltage Regular 5v Circuit

Voltage Regular 5v Circuit


Voltage Regular 5v DC Simulation

Voltage Regular 5v DC Simulation


Voltage Regular 3.3V Circuit LED

Voltage Regular 3.3V Circuit LED


Voltage Regular 5V Circuit LED

Voltage Regular 5V Circuit LED


Voltage Regular 5V Simulation Circuit LED

Voltage Regular 5V Simulation Circuit LED


Voltage Regular 5V Simulation LED

Voltage Regular 5V Simulation LED



Cadence Circuit

Cadence Circuit


Circuit

Circuit


Power Consumption Calculations

Power Consumption Calculations


public/ELEC-PIC/Power Consumption 2.png public/ELEC-PIC/AA Battery.png public/ELEC-PIC/9V Battery.png
Power Consumption Calculations AA (1.5 V) Battery 9 Volt Battery
Sensor Active High Output at Low CO

Sensor Active High Output at Low CO


Part Information
3.3V positive voltage regulators Link
5V LDO Voltage Regulator Link
5.1V Zener Diodes Link
General purpose amplifier and switch NPN Link

Sensor Types Selected Sensors Datasheet
CO MQ-7 Gas Sensor (C9O) Link
PM PPD42NS Link
Temp&Humid SHT15 Link

Software

center

center

Mobile Data Visualizer

Mobile Data Visualizer

Bill of Materials

QTY. Product Number Description Cost (each) Producer Product Link Purchased From
1 Custom Printed PCB $33.00 Advanced Circuits Advanced Circuits
1 605-0007-ND Carbon Monoxide Sensor $5.99 Parallax CO Gas Sensor Digi-Key
1 27931-ND Carbon Monoxide Sensor with Break-Out Board $19.99 Parallax CO Sensor Break-Out Board Digi-Key
1 EG4564-ND On/Off Switch $2.47 E-Switch Switch Digi-Key
12 N107-ND Energizer Industrial AA Battery $0.65 Each Energizer Battery Digi-Key
3 350-1634-ND Colored LED $1.50 each Dialight Red LED Digi-Key
1 LM2937 3.3V Positive Voltage Regulators $1.25 each Parallax 3.3V Regulators Digi-Key
1 LM2940CT 5V LDO Voltage Regulator $1.25 each Parallax 5V LDO Regulator Digi-Key
5 1N5231B-ND 5.1V Zener Diodes $0.12 each Fairchild Semi-Conductor 5.1V Zener Diode Digi-Key
5 1N5226BFSCT-ND 3.3V Zener Diodes $0.12 each Fairchild Semi-Conductor 3.3V Zener Diode Digi-Key
2 2N3904 General Purpose Amplifier & Switch NPN $0.76 each Fairchild Semi-Conductor Amplifier Digi-Key
2 LM741 Operational Amplifier $0.70 each Texas Instuments Operational Amplifier Digi-Key
1 3003918 Screen Material $5.98 Screen Home Depot
2 31-GE-XL-1 10" x 8" Clear LEXAN Sheet $3.98 Lexan Home Depot
1 0448106686 PVC Junction Box $11.46 Carlon CARLON Lowes
1 99055A110 1 Meter M4 Plain Steel Threaded Rod $9.52 Rod McMaster-Carr
1 90592A011 100 Plain Steel M4 Nuts $1.39 NUTS McMaster-Carr
1 5234K252 10 Ft Super-Soft Latex Rubber Tubing 3/16" ID 3/8" OD $1.20/ft Spacer Material McMaster-Carr
4 90116A015 M2 x 8mm $7.67 per 100 Screw McMaster-Carr
4 91828A111 M2 x 1.6mm Nut $4.50 per 100 Nut McMaster-Carr
2 90965A110 M2 Washer $1.48 per 100 Washer McMaster-Carr
3 90116A209 M4 x 12mm $7.24 per 50 Screw McMaster-Carr
3 91828A231 M4 x 3.2mm $6.45 per 100 Nut McMaster-Carr
1 USBPNLAFHD1 1 ft. Panel Mount USB Cable - USB A to Motherboard Header Cable F-F $6.99 StarTech NEWEGG NewEgg
2 1155 6-AA Battery Holder $1.75 Pololu Battery Holder Pololu
1 SEN-08257 Temperature & Humidity Sensor $41.95 Sensirion Temp & Humidity Sensor Sparkfun
1 Particulate Matter Sensor $40.32 Speed Technology Inc.
1 MSP-EXP430G2 Microcontroller $4.30 Texas Instruments TI eStore
1 Miscellaneous Electrical Components $30.00
Budget Worksheet Cost Analysis
Cost of 1 Monitor $277.09
Cost of 2 Monitors $527.22
Cost of Testing $50.00 - $300.00
Desired Budget $1000.00

Test Plans

Testing Procedures

Risk Assessment

Risk Assessment

Hanging Options

Schedule

Work Breakdown Structure

Additional Needs

Action Items

Detailed Design Review Feedback

Feedback From Detail Design Review:
Based on the review the circuitry is mostly correct except for certain parts which needed to be redesigned.

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