S17: Logan
Contents
- 1 Logan The Smart Lock
- 2 Abstract
- 3 Objectives & Introduction
- 4 Schedule
- 5 Parts List & Cost
- 6 Design & Implementation
- 7 Testing & Technical Challenges
- 8 Conclusion
- 9 References
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 Home Lock system provides an alternate convenient way of access control on a user's smart phone. Smart Home Lock can simplify life and increase home security. Smart Home 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
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| 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
Printed Circuit Board
Design
We have designed a 3.56 X 3.16 Inch Printed Circuit Board (PCB) to interface our Text-to-Speech, PIR Sensor and Electric Door Strike. It is worth designing the PCB as it reduced the hardware complexity and saved lot of wires.
Eagle PCB Design Tool
We have ordered the PCB boards from PCBWay. It took 2 weeks to receive the boards. The actual PCB Boards snapshots are given below:
Connector List
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.
Hardware Design
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Software Design
Electric Door Strike
We have used a 1-Channel relay to control the Electric Door Strike from GPIO.
Hardware Design
Software Design
Mobile App
Hardware Design
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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
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
Software Design
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Testing & Technical Challenges
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Include sub-sections that list out a problem and solution, such as:
Issue #1
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.
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
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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
- Bluetooth
- PIR Motion Sensor
- Text-to-Speech
- [Relay]
