ic07722
Newbie level 4
Hi, I'm new here, please be gentle. I'm also a complete novice, so apologies if I'm a bit thick!
Some years ago I bought a commercially available car immobiliser which used a latched relay. This proved so successful that even when I exchanged my car at the main dealer (and explained the immobiliser) I had to return to start the car for them. I can no longer find this device in the obvious places (Amazon & eBay) so I'm trying to design my own. I have drawn up a circuit diagram and would be most grateful if one of you experts out there could look over the circuit and advise me of its viability or any improvements I need to make. It is very simple circuit, but alas not to me. The circuit diagram is attached to this post.
Basically it functions as follows: When the car ignition is switched on the relay is open and hence the fuel pump/coil does not function. Whilst the engine will turn over, it will not start. Momentarily pressing the button causes the relay to close two circuits: The first is the power to the relay to keep it closed (latched); the second is to close the circuit to the fuel pump/coil to enable the car to start. When the ignition is switched off, the power to the relay is cut and it returns to the open state (hence I can't forget to set it).
Thanks in advance for any help, I really appreciate it.
Ian.
Some years ago I bought a commercially available car immobiliser which used a latched relay. This proved so successful that even when I exchanged my car at the main dealer (and explained the immobiliser) I had to return to start the car for them. I can no longer find this device in the obvious places (Amazon & eBay) so I'm trying to design my own. I have drawn up a circuit diagram and would be most grateful if one of you experts out there could look over the circuit and advise me of its viability or any improvements I need to make. It is very simple circuit, but alas not to me. The circuit diagram is attached to this post.
Basically it functions as follows: When the car ignition is switched on the relay is open and hence the fuel pump/coil does not function. Whilst the engine will turn over, it will not start. Momentarily pressing the button causes the relay to close two circuits: The first is the power to the relay to keep it closed (latched); the second is to close the circuit to the fuel pump/coil to enable the car to start. When the ignition is switched off, the power to the relay is cut and it returns to the open state (hence I can't forget to set it).
Thanks in advance for any help, I really appreciate it.
Ian.