Difference between revisions of "F18: Wireless sensor network"

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===Custom PCB BoM===
 
===Custom PCB BoM===

Revision as of 01:53, 14 December 2018

Wireless Sensor Network

Abstract

A wireless sensor network (WSN) consists of collection of sensor nodes. Each individual node consists of MCU with on-board sensors and Nordic wireless mesh for communication, which are distributed to monitor physical or environmental conditions, such as temperature, ambient light, humidity etc. The SJ-One board contains an onboard light intensity sensor, and a custom PCB for the project has a combined Temperature, Pressure, and Humidity sensor and an air quality sensor. These sensor data are transmitted to a network coordinator which is the controls the wireless mesh network. The advantage of a mesh configuration is that the data flow is uninterrupted in the network even if one of the nodes fails. The coordinator board colates the data from all nodes, and displays it on a 16x32 LED matrix.

Objectives & Introduction

Show list of your objectives. This section includes the high level details of your project. You can write about the various sensors or peripherals you used to get your project completed.

Team Members & Responsibilities

  • Halak Vyas
    • RTC Config (primary), Wireless driver (secondary), Sensor drivers
  • Jay Parsana
    • Display driver (primary), Sensor drivers
  • Prashant Gandhi
    • PCB Assembly, PCB Design (review), Sensor drivers
  • Tristan French
    • Team lead, PCB Design (primary), PCB Assembly (secondary), Display driver (secondary)
  • Vatsal Makani
    • Wireless driver (Primary), PCB design (secondary), Wiki lead

Schedule

Week# Date Task Actual
1 10/9 Tristan
  • Order LED matrix

Everyone

  • Assign team roles
 Tristan
  • Matrix ordered (10/1), Received (10/14)

Everyone

  • Team roles assigned (10/16)
2 10/16 Everyone
  • Create wiki schedule

Everyone

  • Initial schedule created(10/16).

Unforeseen issues

  • Issues with wiki login credentials (resolved)
  • Discovered antennas that we have do not match the connector, must order new ones (resolved)
3 10/23 Vatsal
  • Order antenna adapters

Vatsal

  • adapters ordered
4 10/30 Halak
  • RTC programming started

Tristan

  • PCB design requirements complete
 Halak
  • RTC programming started

Tristan

  • PCB Design requirements delayed, still finalizing sensors.
5 11/6 Halak
  • task

Jay

  • Acquire power supply for LED matrix, review Adafruit library

Prashant

  • Review and update schedule for your subsystem.

Tristan

  • PCB design complete and ordered (including components)

Vatsal

  • Review nordic wireless API, and plan code
 Halak
  • Completed?

Jay

  • Acquired (Tristan already had a power supply)

Prashant

  • Schedule updated

Tristan

  • Poor documentation on MQ-135, waiting for parts before releasing PCB. Design 95% complete

Vatsal

  • Investigated, have questions for Preet next week
6 11/13 Halak
  • RTC programming done

Jay

  • Initial LED matrix testing

Prashant

  • Review PCB design

Tristan

  • PCB and components Ordered

Vatsal

  • Basic wireless driver (send/receive a byte)
 Halak
  • RTC code complete, need battery to test.

Jay

  • LED matrix initial test completed (able to light desired LED).

Prashant

  • Reviewed and approved

Tristan

  • PCB ordered (11/10) arriving 11/15.

Vatsal

  • Wireless not functioning yet, Prashant and Halak to provide support.
7 11/20 Halak
  • Write initial driver to read BME280 sensor values

Jay

  • Display symbols on matrix

Prashant

  • Write MQ-135 sensor driver and test

Tristan

  • PCB Soldered

Vatsal

  • Wireless driver send/receive sensor data
 Halak
  • Able to read raw data values

Jay

  • Displaying letters and numbers

Prashant

  • Code written to read MQ-135, need to test

Tristan

  • One PCB soldered and initial test completed

Vatsal

  • Initial transmitter code complete, receiver mostly complete, troubleshooting
8 11/27 Halak
  • Finish BME280 Driver

Jay

  • Parse and display ASCII sensor data

Prashant

  • Finish MQ-135 driver
  • Solder remaining PCBs

Tristan

  • Solder remaining PCBs

Vatsal

  • Wireless driver code to Send and Receive Sensor Data
 Halak
  • Driver working, beginning to interface with wireless

Jay

  • Displaying data values (numerical inputs, don't need ASCII)

Prashant

  • Driver working, beginning to interface with wireless
  • Scheduling conflict, planning to finish soldering Fri 11/30

Tristan

  • Scheduling conflict, planning to finish soldering Fri 11/30

Vatsal

  • Wireless test is functional, beginning to integrate sensor readings
9 12/4 Halak
  • Make BME280 data accessible by wireless module

Jay

  • Read and display Sensor display from wireless, and switch between display devices

Prashant

  • Make MQ-135 data accessible by wireless module

Tristan

  • Support integration

Vatsal

  • Make received sensor data available to display driver

Everyone

  • Integration of all drivers/modules, All sensor readings working
 Halak
  • Data integrated with wireless communication

Jay

  • Having issues with connection to LED matrix, possible bad matrix (investigating)

Prashant

  • Data integrated with wireless communication

Tristan

  • Data being sent over wireless.

Vatsal

  • Sending and receiving all sensor data, waiting on LED matrix issue

Everyone

  • Partially complete, delayed by issues with LED matrix
10 12/11 Everyone
  • Debugging any major issues, Project complete
 Everyone
  • All core code functionality is implemented, still need to clean up and finalize details of functionality.
11 12/19 Everyone
  • Final code cleanup and testing.
  • Project Demo and Review day
 Everyone
  • Completed?

Parts List & Cost

Top level BoM

Item# Part Source Quantity Unit

Cost($)

Total

Cost($)

1 SJ One Board Preet 5 80.00 400.00
2 Adafruit RGB LED Matrix LED Matrix 1 24.95 24.95
3 LED matrix Connector board LED Matrix 1 1.00 1.00
4 Led Matrix Power Adapter N/A (Stock) 1 N/A 0.00
5 Air Quality Sensor Willwin 4 4.50 18.00
6 Custom Sensor PCB Assembly In House 4 14.72 58.87

Total (minus SJ-one cost): $102.82

Custom PCB BoM

Item# Part Source Quantity Unit

Cost($)

Total

Cost($)

1 Custom Sensor PCB JLCPCB 4 0.20 0.80
2 SMD P, T, H sensor Digikey 1 6.628 6.628
3 USB mini-B SMD receptacle Digikey 1 0.87 0.87
4 2-position screw terminal, .1in pitch Digikey 1 0.595 0.595
5 2-pin male header, .1in pitch Digikey 2 0.099 0.198
6 4-pin female header, .1in pitch Digikey 1 0.45 0.45
7 17-pin female header w/ long pins, .1in pitch Digikey 2 1.719 3.438
8 Red SMD LED, 0603 Digikey 2 N/A 0.00
9 100 Ohm SMD resistor, 0603 Digikey 1 0.30 0.30
10 300 Ohm SMD resistor, 0603 Digikey 1 0.066 0.066
11 2.2 kOhm SMD resistor, 0603 Digikey 2 0.024 0.048
12 3.3 kOhm SMD resistor, 0603 Digikey 2 0.024 0.048
13 4.7 kOhm SMD resistor, 0603 Digikey 4 0.30 1.20
14 0.1uF ceramic capacitor, 0603 Digikey 2 0.038 0.076
15 SMD Air Quality sensor Digikey 1 (optional) 12.88 0.00
16 2-pin jumper, .1in pitch Digikey 1 (optional) 0.45 0.00

Total: $14.72

Design & Implementation

Bottom of Sensor PCB
Top of Sensor PCB

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

Software Design

Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Include sub-sections that list out a problem and solution, such as:

<Bug/issue name>

1. In Wireless Tx section, mesh_init() needs a parameter of type mesh_driver which needs some initialization. In Wireless Rx section, ensuring the receipt of packets needs some review.

2. Calibration of Air Quality Sensor and Temperature/Humidity/Pressure sensor is a challenging part.

3. Unstable/inconsistent display on LED matrix. Suspect it is due to high frequency and poor connections with jumper cables, planning to make simple header breakout for more robust connection.

  • Header breakout did not help, investigating possibility of an issue with the matrix itself.
  • Issue resolved. The breakout board did end up fixing the connection issue, but an erroneous line of code which set the latch too early was the main problem.

Conclusion

Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?

Project Video

Upload a video of your project and post the link here.

Project Source Code

References

Acknowledgement

Any acknowledgement that you may wish to provide can be included here.

References Used

List any references used in project.

Appendix

You can list the references you used.

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