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Hi everybody :) i want to share with you a little project. It's a portable emergency button that i did to my mom (she have cancer) and i need to know how can i find her if she need me. This button have a GPS and GSM module, that send a SMS and a link of google maps with localization on SMS (pretty cool ah? :) ), you can transport this on your belt. It's good for people that have diseases like cancer, diabetes, etc...

Let know more about this :)

Step 1: Material

Well, this is what you need to do it yourself:

-Linkit One (with battery, GPS and GSM module)

-Iron solder

-3D printer

- a big push button (NO to send SMS with google maps link)

- three 3mm leds (yellow, green and red)

- a driller machine (to drill holes of linkit)

- lot of flexible cable wires

-hot glue (to hold the push button

-headers (to connect at linkit)

-button on/off (power off battery)

Step 2: 3D Drawings and Files

Here you can use and edit my 3D drawings models, I used Autodesk Inventor 2016 to draw. Have STL files too for 3D printing :)

https://dl.dropboxusercontent.com/u/40132197/drawings%20belt.zip

Step 3: How to Do It?

It's very simple, all you need to do is:

- 3D print the linkit case

- soldering the flexible wires to leds, pushbutton, button on/off and battery and headers

- use hot glue to hold the push button

- drill the holes on case to hold the link one

- put GPS and GSM module on case and connect to linkit

- use good glue to hold the piece of belt on linkit case

PS: i needed cut the SPI headers of my linkit because push button is big and i can't close the linkit case :P

The wiring connection port of linkit one is:

pin 2- connect a one wire of push button

GND- connect the other wire of pushbutton

pin 12- green led positive (don't need a resistor)

pin 11- yellow led positive

pin 10- red led positive

Step 4: Code

the code is from another user of instructables, but i changed a bit. I added the leds to indicate the battery level.

It works by this way:

- If green blinks, the battery is between 100% and 67%

- If yellow blinks, the battery is between 66% and 34%

- If red blinks, the battery is between <=33%

You press the button, when all leds are off it means that linkit sent a SMS (I will add a buzzer too in future)

You can charge the battery easy with a usb cable. I will add to this project a buzzer to indicate that linkit sent a SMS and a improvement of battery.

Step 5: Finish

Well, this instructables ends here, i hope that you like this and be useful on your life.

Feel free to ask something that you don't understand :)

Thanks Mediatek for this linkit one to do this project :)

Cool. Could you not make it so that the switch connects to the power for the Linkit1, then the board could set a pin high that activates an transistor connected to the power supply, this way shouldnt it turn itself off?
<p>Its best to keep the board powered up. It wastes battery but getting a GPS location fix can take a long time from a power up.</p><p>Since he's going for emergency response it is the way to go.</p><p>I've seen a few of those auto power circuits. Really good idea but easier to do on an Arduino since these linkit's can take a long time before they actually start your sketch.</p>
<p>Oh.....</p>
<p>Hi, thanks for reply. For my case, this is the best way to my mom &quot;call me&quot; in a emergency, it works very well. The only bad thing is battery that need to charge everyday.</p>

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