Difference between revisions of "S16: SmartDoorLock"

Revision as of 06:11, 24 May 2016

Grading Criteria

SmartDoorLock

Abstract

The frustration when you forget or lose the keys to your door is a common experience. SmartDoorLock provides a mechanism to lock and unlock your door with just your mobile phone, using bluetooth communication. The door also opens automatically when it senses an object approaching from the inside. An additional feature in the project is that a display near the entrance informs you about the weather outside, and gives friendly suggestions accordingly.

Objectives & Introduction

• Communication between Bluetooth Module and Android app
• Locking and unlocking electric strike via Bluetooth with password protection.
• Detecting motion using PIR motion sensor.
• Automatic unlocking the door based on motion detection.
• Reading temperature and displaying suggestions.

Team Members

• Arpita Ramanath
• Sravani Aitha

Responsibilties

• Circuit design for Electric door strike
• Establishing Bluetooth communication between SJone Board and Android app using Uart.
• Building power circuits for PIR motion sensor, LCD and Electric door strike
• Interfacing LCD module with SJone Board using Uart.
• Overall Circuit Integration and Testing.

Schedule

Parts List & Cost

Design & Implementation

System Schematic

Fig 1. System Schematic

SmartDoorLock system is designed in a way that Door can be locked and unlocked using an Android app, also it detects the motion when a someone approaches the door towards exit. And it also has a LCD display on the Exit which displays the outside temperature and provides friendly suggestions to the person exiting the door. It has the following components integrated.

• Electric Door Strike : To unlock the door when user sends unlock signal through blurtooth.
• Bluetooth Module : To establish a connection from Android app to SJone Board
• Android app : Application to communicate with the SJone board over Bluetooth.
• PIR Motion sensor : Detects motion if any person approaching the exit, based on Sensor readings SJone board sends a signal to electric door strike to unlock the Door.
• Temperature Sensor : SJone board receives outside temperature using Temperature sensor and passed it to LCD to display.
• LCD : To Display outside temperature and suggestions to the person exiting the door.

Hardware Design

Electric Door Strike

The door strike being used in this project is of the type "fail-secure". This means that when there is no power being supplied to the strike, it remains locked. When a DC power supply of 12V is given, the strike unlocks, which can be detected by the characteristic clicking sound it makes.

Fig 2. Electric Door Strike

// Put image of door strike here

The 3.3V supplied by our SJOne board is not sufficient for operation of the strike, which needs 12V. Hence, we designed a power supply circuit to supply the strike with 12V. The circuit consists of a 12V supply, a 15V to 12V voltage regulator and a couple of capacitors.

// Put circuit diagram, diagram of voltage regulator here

Bluetooth Module

The bluetooth module we are using is the BTBee Pro Xbee Wireless Bluetooth Module from Adafruit. The pins of this module are perfectly compatible with the pins of the SJOne board such that it can be directly fixed on to the board (as shown in the diagram).

// Put image of bluetooth on SJOne board here.

The bluetooth module is interfaced with SJOne using UART2. When a connection is established, it is possible to send and receive messages via bluetooth between the Android App and SJOne board. This section does not require any other hardware.

PIR Motion Sensor Module

The PIR Motion Sensor from Adafruit allows us to sense motion, usually used to detect whether a human has moved in or out of the sensor's range. The sensitivity of this particular sensor is upto 20 feet. It needs a DC power supply of 5V. The circuit we are using to supply 5V to the sensor is similar to the 12V power supply circuit that was designed for the electric door strike. The sensor is interfaced with the SJOne board. The output wire of the sensor is connected to a GPIO pin (made as input) on the SJOne board.

// Put sensor with SJOne board image here

When motion is detected, a logic "1" is sent via the output wire of the sensor to the board. When there is no motion detected, the SJOne board receives a logic "0".

LCD Module

A 20x4 LCD(CM 204-1) module along with a LCD driver by SJValley Engineering is used in the project. The LCD is provided a 5V DC power supply from the same circuit that provides power supply to the motion sensor. The connections between the SJOne board and LCD module are as shown in the diagram below.

// Put LCD and SJOne board connection diagram here.

The LCD module is interfaced with the SJOne board using UART. We have to make sure to set the baud rate correctly before any communication.

Hardware Interface

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Software Design

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Implementation

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Testing & Technical Challenges

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My Issue #1

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Conclusion

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Project Video

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Project Source Code

• Sourceforge Source Code Link

References

Acknowledgement

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References Used

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Appendix

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