This is the tutorial on how to build the switch I developed, to turn a cell phone used for GPS tracking, on and off with motion. This switch will alleviate the problem of J2ME java applications from locking up during long run times (over days or weeks).
Soldering is required. Sparkfun has a great Soldering Tutorial if you need help.
The next step will walk you through what I do when I make them and the order that I have found works best, as well as a couple of tips to make it easier.
Good luck and more importantly, have fun!
Step 1: Solder the 28 Pin DIP Socket First
Step 2: Add 14 DIP Socket
Step 3: Six Pin Female Socket
Step 4: Add 3 Resistors
Step 5: Add Power Connectors
Step 6: Solder Male Connectors to the Accelerometer
Step 7: Put Microchips In
Here is the finished board with the chips in.
Step 8: Solder Power Wires to Your Phone
YOU WILL NOT BE ABLE TO USE YOUR ORIGINAL BATTERY AFTER THIS STEP. YOU WILL HAVE TO USE AN EXTERNAL 3.7 volt BATTERY
Now it's time to solder the wires to your phone. I am using the iDEN 425. This step should be generic for just about any phone. Basically you are soldering a red wire where the positive terminal of the battery touches the phone and a black wire to the spot where the negative terminal of the battery connects to the phone. The 425 phone has four metal tabs that touch the battery. the two outside tabs are the power tabs. You can look at your battery and they usually have a + on the spot for positive and a - on the spot for the negative. I don't know what the other two tabs are used for.
After you solder wires to the battery power terminals of the PHONE AND NOT THE BATTERY, you will be solder wires to the ON / OFF button of the phone. You will have to take off the cover and pull back the front pads. Its stuck on with glue. Just do it gently. I use duct tape again to hold the pad back.
Find the circular pad for the ON / OFF button. On the 425, the center of the circle is the positive and the outside edge is negative. So......solder the red wire to the center dot and the black wire to the outside ring.
Now you can put the phone back together and route the wires however you like so that you can get to them
Step 9: Solder the Red and Black Wires to the Power Connectors
After you do this, push the metal tabs into the female power connectors. There is a groove on the back of the female connector. This groove mates with the tall back on the male counter parts that you already soldered to the board. Face the groove away from you and make sure the red wire gets pushed into the right side and the black wire goes to the left side. IF YOU MESS THIS PART UP, YOU'LL BURN EVERYTHING UP.
Step 10: Plug Wires Into Board and Have Fun.
Plug the wires from the battery (your external 3.7 volt), the on / off button of the phone and the + and - terminals of the back of the phone, into the circuit board that you put together. Plug the battery in last. As soon as you do this, (15 seconds or so) the phone should turn on. Your ready to go!!