Hey guys. I'm new to the site. I haven't been to school for electronics but I have repaired a few things in the past & I'm always wiring stuff up lol. I'm in the process of making a push button start kit for my older car so I don't have to use any keys to start it like the newer cars. I want to car to be a little secure so I'll be using a hidden RFID transponder so without the key fob my car will not start.
I have a NO momentary "engine start" switch,
& I have a RFID transponder with 2 key fobs
http://cgi.ebay.com/RFID-Reader-tra...897?pt=LH_DefaultDomain_0&hash=item35a7b68ee9
When the key fob is brought within 3 inches of the antenna on the RFID brain, the unique date encoded in the key fob is transferred to the sensor-receiver, activating the device-relay & the relay will turn on my ACC, & ignition. I will keep the fob my back pocket & the antenna will be fished up into my seat so when I sit down the brain will be able to read the code of the fob.
The engine start button will be wired to receive power once I press the brake pedal. When I press the "engine start" switch & close the circuit it will send power through a relay (getting power directly from the battery) then to the starter to engage it.
Once I press the button to engage the starter the car will start but here is where I confused. When I press the button to start the car I need the starter to stay engaged until I release the button (older cars take a little longer to start sometimes) then I want the same button to shut the engine off when pressed again instead of engaging the starter and making it grind against my flywheel. I was reading in a another thread and someone mentioned a D flip-flop. I looked into it a little & it seem like it can work for what I'm trying to do here. What do you guys think? Could someone help me draw this out so i can be wired up if it's even possible. Any input is appreciated!
Darius
I have a NO momentary "engine start" switch,
![54762d1222797100t-push-button-start-ignition-snc00006-desktop-resolution-.jpg](/forums/proxy.php?image=http%3A%2F%2Fwww.team-bhp.com%2Fforum%2Fattachments%2Fmodifications-accessories%2F54762d1222797100t-push-button-start-ignition-snc00006-desktop-resolution-.jpg&hash=ec3cf2e3aa2ee2e5069e50a87b3815ed)
& I have a RFID transponder with 2 key fobs
http://cgi.ebay.com/RFID-Reader-tra...897?pt=LH_DefaultDomain_0&hash=item35a7b68ee9
![1c870d49.jpg](/forums/proxy.php?image=http%3A%2F%2Fi211.photobucket.com%2Falbums%2Fbb231%2Fveltboy314%2F1c870d49.jpg&hash=3a0187fd9d943855739e2729428b7c90)
![8d647d9c.jpg](/forums/proxy.php?image=http%3A%2F%2Fi211.photobucket.com%2Falbums%2Fbb231%2Fveltboy314%2F8d647d9c.jpg&hash=3b785b9cdaae67e73c069320b10138c9)
When the key fob is brought within 3 inches of the antenna on the RFID brain, the unique date encoded in the key fob is transferred to the sensor-receiver, activating the device-relay & the relay will turn on my ACC, & ignition. I will keep the fob my back pocket & the antenna will be fished up into my seat so when I sit down the brain will be able to read the code of the fob.
The engine start button will be wired to receive power once I press the brake pedal. When I press the "engine start" switch & close the circuit it will send power through a relay (getting power directly from the battery) then to the starter to engage it.
Once I press the button to engage the starter the car will start but here is where I confused. When I press the button to start the car I need the starter to stay engaged until I release the button (older cars take a little longer to start sometimes) then I want the same button to shut the engine off when pressed again instead of engaging the starter and making it grind against my flywheel. I was reading in a another thread and someone mentioned a D flip-flop. I looked into it a little & it seem like it can work for what I'm trying to do here. What do you guys think? Could someone help me draw this out so i can be wired up if it's even possible. Any input is appreciated!
Darius