Accelerometer Automated Locking system

I would recommend against the accelerometer approach, the kind of vibrations you are using to detect road surface imperfections during movement could easily be created by a stampede of people trying to get out. Of the suggestions made so far, GPS seems about the best IMHO.

Also think about the duty cycle of your looking mechanism, as it will be releasing and relocating every time the vehicle comes to a standstill.

When considering the locking mechanism look into fail-safe mechanisms. At least the lock will fail into safe condition (where the door opens) should any system damage occur.

But i have never used a GPS before.
How can you help me

Thank you Enrico. I will look into that.
I am very at ease with arduino. Wont it take too much time now, to understand the pi all that?

I think it seems more complex but as it is more powerful, I think you have a wider range of possibilities to understand and make a well done project with - definitely - less difficulties.

Hey Enrico. are you sure nothing can be done with the arduino?
I have a tight schedule and desperate where I am right now
ok..tomorrow i will go on a bus with the accelerometer..
I will see if the values of X, Y and Z of it are different when the bus is moving and when it stops.
I will do it till the bus terminal.
Then I'll let you know.

This check is anyway a good thing, I think.  Then let me know what components do you already have so I can give you a more appropriate suggestion. I though that you was deciding what to use.

Enrico

Yes okay.
so basically I have an:
1. Arduino UNO
2. 3 Axis Gyroscope+Accelerometer Module for Arduino MPU 6050
3. I have not still buy thew electric lock but what do you think of this: http://www.ebay.com/itm/121654248932
4. A relay

Yuvish Chintaram wrote:

 

3. I have not still buy thew electric lock but what do you think of this: http://www.ebay.com/itm/121654248932

Bear in mind that it's a fail locked model, so if your system power/arduino fails nobody will be able to open it.

Yeee! You have almost all

Well so in this case we should try to make the project with these components.

Arduino UNO is ok as you have the gyroscope accelerometer. For now we can wait to see if this can be sufficient or not.

I suggest that in this phase it is not the worth to buy ANY electric lock system, the most important stage is that you make a working prototype so the relay response is more than sufficient to demonstrate how does it works.

Did you have already connected some of the hardware ? What ? How do you connected the relay?

By the software side what is the sketch you are working on ? Please post the code so we can have an idea. Thanks.

Hey Enrico, i have still not got the relay but i will get it in the coming days.
I'll send you the circuit in some minutes. The circuit(I think) i can manage.
Its the sketch which is the problem
But i'll try then you guys correct it.

Ok, I'll check the material as I am back.

Enrico

Ok Enrico.thnx for all by the way

Ok Enrico.thnx for all by the way

Please note the big green part represent the lock.
I am not an expert in elctronics so feel free to correct me

Yuvish,

it is my opinion that this circuit - that seems at least well done and set - maybe perfect or crap. It depends on two things: the correct connections between the accelerometer and the other components to the Arduino pins but - first of all - how do you manage with a script the signals, pins and connections - So untile we can't see a line of your code we can't imagine what you are doing with this stuff.

Enrico

Hey Enrico, I did the sketch below with a MMA 7455, its just a rough one. And I am still figuring out how to send a signal to the relay to make the electric lock lock and unlock. Help me if any one know.

#include <Wire.h> //Include the Wire library

#include <MMA_7455.h> //Include the MMA_7455 library

/*-----( Declare Constants and Pin Numbers )-----*/

/*-----( Declare objects )-----*/

MMA_7455 mySensor = MMA_7455(); //Make an instance of MMA_7455

/*-----( Declare Variables )-----*/

char xVal, yVal, zVal; //Variables for the values from the sensor

void setup() /****** SETUP: RUNS ONCE ******/

{

  Serial.begin(9600);

  delay(500);

  Serial.println("MMA7455 Accelerometer Test");

  // Set the sensitivity you want to use

  // 2 = 2g, 4 = 4g, 8 = 8g

  mySensor.initSensitivity(2); // Good for "Tilt" measurements

/*

  Calibrate the Offset. Calibrate, in Flat position, try to

  get: xVal = 0, yVal = 0, zVal = +63 (1 G)

  !!!Activate this after having the first values read out!!!

  Suggestion: Run this with offsets = 0,0,0 and see needed correction

  mySensor.calibrateOffset(0,0,0); //Uncomment for first try: find offsets

  mySensor.calibrateOffset(-5.0, 13.0, -12.0); //Then Uncomment and use this

*/

}

void loop() /****** LOOP: RUNS CONSTANTLY ******/

{

  xVal = mySensor.readAxis('x'); //Read out the 'x' Axis

  yVal = mySensor.readAxis('y'); //Read out the 'y' Axis

  zVal = mySensor.readAxis('z'); //Read out the 'z' Axis

  Serial.print("X = ");

  Serial.print(xVal, DEC);

  Serial.print(" Y = ");

  Serial.print(yVal, DEC);

  Serial.print(" Z = ");

  Serial.println(zVal, DEC);

  delay(500);

/*--( Show tilt [Assumes unit has been calibrated ] )----*/ 

  if (xVal < -20) Serial.println("Tilted LEFT");

  if (xVal > 20) Serial.println("Tilted RIGHT"); 

  if (yVal < -20) Serial.println("Tilted TOWARDS"); 

  if (yVal > 20 ) Serial.println("Tilted AWAY"); 

  if (zVal < -45 ) Serial.println("UPSIDE DOWN!"); 

}