- Introduction
- Bill of Materials/Budget
- Time Commitment
- Mechanical_Assembly
- PCB/Soldering
- Power_Up
- Unit_Testing
- Production_Testing
- Reproducability
| Parts for Parking Management System | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Description | Source | Part # | US$ Unit Cost | CAD$ Unit Cost | Number of units | US$ Subtotal | CAD$ Subtotal | Link | Comments | |
| RaspberryPi3 Model B Motherboard | Amazon Canada | $55.99 | 1 | $0.00 | $55.99 | https://www.amazon.ca/gp/product/B01CD5VC92/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 | None | |||
| 20cm length Jumper Wires | Amazon Canada | $9.98 | 120 | $9.98 | https://www.amazon.ca/gp/product/B01LZF1ZSZ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 | None | ||||
| Kingston Digital Select 16GB microSDHC | Amazon Canada | $9.52 | 1 | $9.52 | https://www.amazon.ca/gp/product/B079H6PDCK/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 | None | ||||
| Keyestudio Camera Module 5MP REV 1.3 | Amazon Canada | $12.99 | 1 | $12.99 | https://www.amazon.ca/gp/product/B073RCXGQS/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 | None | ||||
| VCNL4010 Proximity/Light sensor | Amazon Canada | 466 | $12.99 | 1 | $12.99 | https://www.amazon.ca/gp/product/B008AS328Q/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 | None | |||
| Amazon Shipping | $16.98 | |||||||||
| Amazon Tax | $11.56 | |||||||||
| 22 microfarad 450v 20% 85c capacitor | Jameco | 10997 | $0.49 | $0.63 | 1 | $0.49 | $0.63 | https://www.jameco.com/z/A22-50-Illinois-Capacitor-22-micro-F-50-VDC-85-deg-C-Electrolytic-Capacitor_10997.html | None | |
| 100 nanofarad 100V capacitor | Jameco | 26965 | $0.29 | $0.38 | 2 | $0.29 | $0.38 | https://www.jameco.com/z/MY-1--1-uF-100-Volt-Mylar-Capacitor_26956.html | None | |
| 10 microfarad 25v 20% capacitor | Jameco | 94212 | $0.19 | $0.25 | 1 | $0.19 | $0.25 | https://www.jameco.com/z/10UF-25V-4X5-R-10uF-25V-20-Radial-Capacitor-85C-4x5x1-5mm_94212.html | None | |
| Jameco Shipping | $20.74 | $26.85 | ||||||||
| Jameco Tax | $7.99 | $10.35 | ||||||||
| Total for parts from US sources | $29.70 | |||||||||
| Total for parts from CAD sources | $168.47 | |||||||||
| CAD$ Total for parts from all sources (using USD$1=CAD$1.29) | $208.86 | |||||||||
| CAD$ Total per parking device | $10.44 |
My schedule was as follows:
You may need about 4 hours a week to complete the project within 2 weeks. Or 8 hours to complete it in a day.
Below is the breadboard design:
Assembly will result in something like this:
This acts as a good way to test the desgin.
The PCB layout is as follows:
Attached to the Pi, the final design should resemble this:
Do note that 20*2 stackable headers were used for mounting the PCB to the breadboard. I used a 6 pin stack for mounting the proximity sensor to the PCB board.
By powering the Pi, this command should be used to make sure that i2c device has been detected:
To do UNIT testing, I tested to see whether I could get proximity readings. As shown in the production testing unit, these proximity readings were used to perform some simple calculations.
Run the script in software(pms.py) to have a test run of the device in Action:
The test run successfully and was able to obtain proximity readings and mock a test payment process.
The project is reproducable by simply following the instructions laid out above. The toughest part is acquisition of the various parts. However, the project can be built completely in 5 hours if all the parts are present. In terms of feasability, the cost per device would amount to ~ $10 which could allow it to scale. In addition, the device could be modified to be powered by a solar panel or power bank and headless connectivity could be achieved by editing the wpa_config file in the root directory of the pi with required network settings so that each parking device can be accessed wirelessly over a WiFi network,
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