Difference between revisions of "S17: Logan"

From Embedded Systems Learning Academy
Jump to: navigation, search
(→‎3D Printing for PIR Mount)
(→‎Connector List)
Line 219: Line 219:
  
 
==== Connector List ====
 
==== Connector List ====
 +
 +
==== EAGLE Connector List ====
 +
[[File:CMPE_244_S16_Biker_Assist_Maxbotix_PCB_Schematic_2.jpg|right|400px|thumb|PCB Schematic Diagram]]
 +
{| class="wikitable"
 +
|-
 +
! scope="col"| Purpose
 +
! scope="col"| Connector Type
 +
! scope="col"| Library
 +
! scope="col"| Package
 +
! scope="col"| Device Name
 +
|-
 +
|-
 +
! scope="row"| Power
 +
| 3x2-pin
 +
| SparkFun-Connectors
 +
| SCREWTERMINAL-3.5MM-2
 +
| M023.5MM (M02)
 +
|-
 +
|-
 +
! scope="row"| Power
 +
| USB
 +
| SparkFun-Connectors
 +
| USB-AB-MICRO-SMD_V03
 +
| USB-ABCONN-11794 (USB-AB)
 +
|-
 +
|-
 +
! scope="row"| Power
 +
| Capacitors
 +
| SparkFun-Capacitors
 +
| 1206
 +
| CAP1206(CAP)
 +
|-
 +
|-
 +
! scope="row"| SJSUone Board
 +
| 4x17-pin
 +
| SparkFun-Connectors
 +
| 1X17_NO_SILK
 +
| M17NOSILK (M17)
 +
|-
 +
|-
 +
! scope="row"| Text To Speech
 +
| 1x6-pin
 +
| SparkFun-Connectors
 +
| 1X06_NO_SILK
 +
| M06NO_SILK_FEMALE_PTH (M06)
 +
|-
 +
|-
 +
! scope="row"| Distance Sensors
 +
| 2x5-pin
 +
| SparkFun-Connectors
 +
| JST-5-PTH
 +
| M05JST (M05)
 +
|-
 +
|-
 +
! scope="row"| Direction Sensor
 +
| 1x4-pin
 +
| SparkFun-Connectors
 +
| JST-4-PTH
 +
| M04JST- PTH (M04)
 +
|-
 +
|-
 +
! scope="row"| Extra GPIO
 +
| 1x4-pin
 +
| SparkFun-Connectors
 +
| JST-4-PTH
 +
| M04JST- PTH (M04)
 +
|-
 +
|-
 +
! scope="row"| LED
 +
| 3x3-pin
 +
| SparkFun-Connectors
 +
| JST-3-PTH
 +
| M03JST- PTH (M03)
 +
|-
 +
|-
 +
! scope="row"| LCD
 +
| 1x10-pin
 +
| SparkFun-Connectors
 +
| 1x10_NO_SILK
 +
| M10NO_SILK_PTH_FEMALE (M10)
 +
|-
 +
|}
  
 
=== PIR Motion Sensor ===  
 
=== PIR Motion Sensor ===  

Revision as of 09:45, 25 May 2017

Logan The Smart Lock

Abstract

A staggering 1.4 billion smartphones were sold in 2015. An average consumer checks his or her smartphone 46 times a day, and in the US, people do this a collective 8 billion times every 24 hours. Most people at some point lose or forget to bring their key. Our Smart Lock system provides an alternate convenient way of access control on a user's smart phone. Smart Lock can simplify life and increase home security. Smart Lock provides a mechanism to lock and unlock your door with your Smart Phone, using Bluetooth communication with password protection. The door locks/unlocks automatically when the correct password is entered on the Mobile App and the motion sensor senses the motion when a person approaching from the inside towards the exit in order to lock the door to provide security. We are using Nordic Wireless communication to access multiple locks in this project. Another additional feature in the project is interfacing the Text-to-Speech in order to inform/guide the users at every step.

Objectives & Introduction

  • Locking/Unlocking of the Electric Door Strike using a Mobile App over Bluetooth
  • Design of Printed Circuit Board (PCB) to simplify the hardware system design
  • Combination of PIR Motion sensor and Mobile App to increase security
  • Accessing the doors using the Nordic Wireless
  • Text-to-Speech to guide the User at every step

Team Members

Roles & Responsibilities

  • Harsha Gorantla
    • Text-to-Speech Module, PCB Design and Complete System Algorithm
  • Krishank Mehta
    • Hardware Design and assembling, Software Flow, PCB design, PIR sensor and Door Strike
  • Prashant Aithal
    • Mobile App, PCB Deisgn and Nordic Wireless Communication
  • Shruthi Narayan
    • LCD, PCB design, Bluetooth and Testing

Schedule

Show a simple table or figures that show your scheduled as planned before you started working on the project. Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals. The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.

Sl. No Start Date End Date Task Status Actual Completion Date
1 03/21/2017 03/28/2017 Project proposal submitted Completed 03/21/2017
2 03/28/2017 04/04/2017 Research on the whole system flow and deciding on components
Assign individual task
Order the components 		Completed 04/04/2017
3 04/04/2017 04/11/2017 Implementation of the PIR sensor with the SJ one board
Initial circuit design of PCB 		Completed 04/11/2017
4 04/11/2017 04/18/2017 Integration and testing of Electric Door strike functionality
Design of PCB for bluetooth, PIR sensor, LCD, SJOne, door-strike related pins on the PCB 		Completed 04/18/2017
5 04/18/2017 04/25/2017 Integration of door strike with PIR sensor
Interface Bluetooth module with SJOne board
Design of the Android Mobile app. 		Completed 04/25/2017
6 04/25/2017 05/02/2017 Verify communication between Bluetooth module and Android app
Extending the functionality to multiple locks using Nordic Wireless. 		Completed 05/02/2017
7 05/02/2017 05/07/2017 Integration of Text-to-Speech module
Individual system testing. 		Completed 05/07/2017
8 05/07/2017 05/14/2017 Integration of the whole system
Debugging and testing of the whole system. 		Completed 05/14/2017
9 05/14/2017 05/21/2017 Final testing and fine tuning
Report preparation. 		In Progress 05/21/2017

Parts List & Cost

Item# Part Description Vendor Qty Cost
1 SJ One Board (LPC 1758) From Preet 3 $240
2 Battery From Amazon 1 $31.57
3 Battery Charger From Amazon 1 $17.50
4 Bluetooth Module From Sparkfun 1 $24.95
5 Electric Door Strike From Amazon 3 $72
6 [PCB] From PCBWay 5 $13
7 PIR Motion Sensor From Amazon 1 $9.95
8 Relays(1 Channel DC 5v relay) From Amazon 5 $16.50
9 Text-to-Speech From Amazon 1 $69.45
10 [ Wires] From Amazon 1 $3.95

Design & Implementation

System Block Diagram

System Block Diagram

Printed Circuit Board

Design

We have designed a custom Printed Circuit Board (PCB) to reduce hardware complexity. The dimensions of the PCB is 3.56 X 3.16 Inch to interface our SJOne board with Text-to-Speech, PIR Sensor, 1-Channel Relay and Electric Door Strike. It is worth designing the PCB as it reduced the hardware complexity and saved lot of wires. The PCB was designed and printed to house the circuit. To design our custom PCB board, we used Autodesk EAGLE PCB software version 8.2.0 which is a free software available online. EAGLE stands for, Easily Applicable Graphical Layout Editor which contains a schematic editor, for designing circuit diagrams. Before starting the PCB design, we downloaded all additional libraries from outside sources such as Sparkfun and Adafruit, to order required components easily.

The tool provides various connectors and devices which are commonly used in PCB’s. The tool is very easy to use. It is just a drag and drop and make connections to join different ports. In our PCB design, we used a lot of connectors with different pin configuration for various peripherals ranging from 3-pin to 20-pin connectors.


PCB Design

Eagle PCB Design Tool

The PCB layout editor allows back annotation to the schematic and auto-routing to automatically connect traces based on the connections defined in the schematic. The layout of the devices and interconnections on the board showcases both the top and bottom layers. The blue lines indicate the connection made from the bottom and red lines from the top. We have used through holes to avoid shorting the pin connections.

We planned the design and positioned the components to ease the accessibility of the pins and ports. We designed a custom 3.56x3.16 inch PCB to integrate different modules together along with the SJOne board. In order to minimize noise, a power copper layer as well as a ground copper layer were added to the top and back of the board. This cleaned up the wiring a lot, since every component contained these wires.


PCB Schematic


After the schematic and board files were completed, we chose PCB fab company called PCB Way since they deliver the PCBs very fast and it is also cost effective. This company is known for reliability, and quick turn around time. In addition to this, their website is very user friendly and designed for hobbyist. We submitted gerber files along with .sch and .brd files. We chose FR-4 grade printed circuit boards (PCB) because they are flame-resistant. FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder. Our design went through the design checking process and when approved, they were manufactured. In total, the PCB took days from submission of payment to receiving the board. We also coordinated with other teams and ordered PCB together to share the shipping cost.


PCB Front

Connector List

EAGLE Connector List

PCB Schematic Diagram
Purpose Connector Type Library Package Device Name
Power 3x2-pin SparkFun-Connectors SCREWTERMINAL-3.5MM-2 M023.5MM (M02)
Power USB SparkFun-Connectors USB-AB-MICRO-SMD_V03 USB-ABCONN-11794 (USB-AB)
Power Capacitors SparkFun-Capacitors 1206 CAP1206(CAP)
SJSUone Board 4x17-pin SparkFun-Connectors 1X17_NO_SILK M17NOSILK (M17)
Text To Speech 1x6-pin SparkFun-Connectors 1X06_NO_SILK M06NO_SILK_FEMALE_PTH (M06)
Distance Sensors 2x5-pin SparkFun-Connectors JST-5-PTH M05JST (M05)
Direction Sensor 1x4-pin SparkFun-Connectors JST-4-PTH M04JST- PTH (M04)
Extra GPIO 1x4-pin SparkFun-Connectors JST-4-PTH M04JST- PTH (M04)
LED 3x3-pin SparkFun-Connectors JST-3-PTH M03JST- PTH (M03)
LCD 1x10-pin SparkFun-Connectors 1x10_NO_SILK M10NO_SILK_PTH_FEMALE (M10)

PIR Motion Sensor

PIR (Passive Infrared )Motion sensor is an inexpensive, small sensor used to detect the human motion. The sensitivity or the range of the PIR sensor is 6 meters(or 20 feet) and works on a 5v input power supply.


PIR Motion Sensor Front
PIR Motion Sensor Back



PIR Motion Sensor Schematic



Hardware Design

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

3D Printing for PIR Mount

Dimensions:

CURA software

Software Design

Electric Door Strike

One Channel Relay

1-Channel Relay


We have used a 1-Channel relay to control the Electric Door Strike from GPIO. The 1-Channel relay is active low circuit and the A and B are internally connected by default(NC). When a input of logic 1 is applied from GPIO to the relay, since the relay is active low, there will be no connection between B and C(NO). The circuit is not complete and so the Electric Door Strike will be locked. On the other hand, when a logic 0 is applied as Input to relay from GPIO, the B and C will be connected which completes the circuit. Hence the Electric Door Strike can be unlocked when the logic 0 is applied.

We need a battery, 1-Channel Relay and SJOne board to complete the Electric Door Strike circuit.


Hardware Design

Electric Door Strike

Software Design

Mobile App

Hardware Design

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

Software Design

Nordic Wireless

We have used Nordic Wireless communication to unlock/lock the Door 1 and Door 2 from the Main Door.

Hardware Design

Nordic Wireless

Software Design

Text-to-Speech

Emic 2 Text-to-Speech module converts the digital text to natural sounding speech. It uses UART to communication with the SJOne board. The Text-to-Speech (TTS) module is connected to the UART2 on the SJOne board. We can pick any voice from the 9 different voices and the volume can also be changed using the various commands. The in-built 3.5mm jack is used to connect the TTS to any speaker/earphones.

The key features are mentioned below:

  • High-quality speech synthesis for English and Spanish languages
  • Nine pre-defined voice styles comprising male, female, and child
  • Dynamic control of speech and voice characteristics, including pitch, speaking rate, and word emphasis
  • Industry-standard DECtalk text-to-speech synthesizer engine (5.0.E1)

Hardware Design

Text to speech Front
Text to speech Circuit
Text to speech Back


Text to speech schematic

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 psuedo-code and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

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:

Issue #1

A. The current was not enough from the SJOne board to unlock the Electric Door Strike. We initially decided to use a N-MOSFET as a switch to control the Electric Door Strike from GPIO pin but the N-MPSFET can only be switched on with 4V where the output from SJOne board is 3.3V. So, We have used 1-Chanel relay to enable the circuit.

B. Initially, we have planned to use a voltage regulator to supply 12V to the door strike from a 15V Battery, but the door strike is working from the Battery input of 7.2V. Hence, Instead of using a voltage regulator and 15V Battery, we are directly using the battery input.

Issue #2

Bluetooth Issue


Conclusion

This project was so much fun to work on. The project has increased our knowledge in both hardware and software know-how. We have interfaced PIR sensor, Text-to-Speech module and designed a mobile application to communicate over bluetooth. We got hands-on experience with the UART and Wireless communication. This project has provided an opportunity to delegate and work in a team. We defined our own objectives, overcame the challenges and successfully completed the project.

Project Video

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

Project Source Code

References

Acknowledgement

We would like to thank Preet for the guidance and the support. The learnings in the class has helped us in the successful implementation of this project.

References Used

Retrieved from "http://socialledge.com/sjsu/index.php?title=S17:_Logan&oldid=37779"