Push Button Start with Passive Device Key wanted

[matty b]

So next time, before you call BS, why don't you give the guy a chance to explain. He said he was going to post a schematic but the way you jumped on him, I'm surprised he responded at all. I don't think I would have.

Look at the last sentence, it starts with the word IF, there are tons of guys that like he said just use the button as a starter button and thats it. Im on alot of electronics forums and maybe 1% of them are in the same league as this. As soon as he posted what he did I also congratualted him on a cheap simple setup. You wouldnt believe how many guys will say that they did something like that and never come back to even show the setup functioning let alone how its made. So although it may come off a bit harsh I didnt go all the way by saying it was BS just that it would be BS if he didnt back up the claim.

jlmccuan- suprisingly the company that makes the cheapy alarm you bought actually makes an RFID push button start kit as well and Im talking with them on how to obtain it or who their supplier is in the US so everyone may not have to go through the trouble of modifying stuff if this can be bought ready to go. Either way good job. Also I gave it some though and figured that you could get a latching relay for the ignition circuit that is pulsed by the alarm on one channel and setup the starter so that when you hold the button for a second a second channel is activated. Some alarms allow for this such as a quick tap unlocks the doors while holding the button for 2 seconds unlocks the trunk. This could be modified for the igniton as well so that the latching relay is controlled by the door unlock and the standard relay is controlled by the trunk release. Only modifications necessary would be to open the alarm box and find the transistior that is trigger by the fob and hard wire off it for a switch. Other way would be to open the fob and hook a switch to the fob button and wire in a voltage drop to the battery in the fob so it is powered by vehicle volatge and not just the little battery in the fob. Im going to go by the alarm/stereo shop today and get a cheap 3 channel alarm and play around with it and see if I can get it to work for under 40 bucks.