Get "On Star" -like system for your car, free.

Step 4 Look for a secret place.

Under my dash board, there is some place, and cabling is kept hidden. So I just bolted it and wrapped the cables.

Now call your cellphone. Once it answers, press a key to set the input you desire on. The table below shows the functions (K, is for keypressed)

K Q1 Q2 Q3 Q4
1 0 0 0 1
2 0 0 1 0
3 0 0 1 1
4 0 1 0 0
5 0 1 0 1
6 0 1 1 0
7 0 1 1 1
8 1 0 0 0
9 1 0 0 1
0 1 0 1 0

• 1 0 1 1

# 1 1 0 0
A 1 1 0 1
B 1 1 1 0
C 1 1 1 1
D 0 0 0 0

So there you have it. Enjoy it and have fun!!!

Comments

[giacomine]

Como eu faço a ligação do celular para o circuito? E como eu faço a programação do celular (teclas)? Obrigado!

[giacomine]

How I make the linking of the cellular one for the circuit? E as I make the programming of the cellular one (keyboard keys)?

[unknownpocketnerd]

Sorry I don't read/speak Portuguese. Can you write that in English?

[giacomine]

How I make the linking of the cellular one for the circuit? E as I make the programming of the cellular one (keyboard keys)? Thank you!

[unknownpocketnerd]

How does the phone connect to the circuit? I just indicated it: Using the handsfree cable earpieze wire. It is and audio signal, and the DTMF decoder needs an audio signal coupled thru a cap. So just connect the audio signal from the phone's handfree to the DTMF input.

[DiamondBack]

"Now call your cellphone. Once it answers ..." This is suggesting that we have a second phone line on our cell plan, am I understanding that right?

[stapler117]

 For this use, adding a second phone to your line would be necessary. it would be better to use a prepaid phone since you wouldn't use many minutes.

[Kasm279]

Yes but when the service expiration date nears you have to buy more minutes. Pretty soon the minutes pile up, even on my mom's phone that she occasionally uses...

[unknownpocketnerd]

I guess they add up.  I am not sure since the service provider some times changes its fees and policies,  but I am pretty sure the phone can take phone calls right.  Anyway, I once in a while call it to see if the phone is still alive and test the functions I have (siren, engine off, locks, etc.).  Only once I had to replace the battery of the cell phone as it was dead and wouldn't charge no more. This is something you will like to do to make sure your system is up and ready whenever you need it.

[shotbythelite]

Umm, no? No one said you needed a second plan to call your cell phone. Just call with another person's phone or your home telephone.

[AndrewNoNumbers]

Wow you must have a lot of patience to do something like this. I gave up just reading the parts list. =]

[unknownpocketnerd]

Thanks. It has proven to be very useful as one day my alarm's remote control battery died, I was unable to get into my car, so I dialed the system's phone from my cell and was able to unlock the doors then I got in and disable the alarm according to the alarm's emergency procedure (ignition on, valet parking switch pressed for 5 seconds, and so on). But I was able to get back home and then took the other remote control. It is like a "plan B" stuff also.

[y2j514]

My plan B for when my alarm remote dies is called a key.  It works pretty well - you put the key in and the door unlocks =D

I mean sure the alarm goes off but you do the emergency override.

[unknownpocketnerd]

I forgot to mention that I disengaged the keylock from the shaft that drives the mechanism, so the only way to get in the car is by means of the electric locks (I am afraid of lock picking).  So my key only works on the ignition switch (for now).