I have a very basic keyless entry module and it only sends one pulse to the door lock solenoid, the problem is the car being old requires 2 or 3 pulses to actually lock or unlock the door. It is a negative trigger system.

Is there something I can add between the module and solenoid that will receive the initial pulse from the module and repeat that pulse 2-3 times?

Thanks

 

Not easily. Either you hack the fob circuits, or build from the ground up a
repeater that receives the fob signal, decodes it and re modulates another
RF transmitter to output the other two+ pulses.

Regards, Dana.

 

Would just a longer pulse work to trigger the solenoid?
That's easy to do.
Sounds like the problem is a marginal signal pulse width.

 

Sorry I should specify, I'm not looking to repeat the RF signal to the module, I was thinking more of another relay that is triggered by the relay in the module.

 

hi dr,
I would say by reducing from 3 pulses to one will greatly reduce the door locks resistance to random RF noise, also the security aspect.
E

 

I would say by reducing from 3 pulses to one will greatly reduce the door locks resistance to random RF noise, also the security aspect.

The problem is that it shouldn't require three pulses.
He wants it to operate with only one pulse from the remote.
That's why I suggested increasing the pulse width.

 

The problem is that it shouldn't require three pulses.

I have seen car remotes that require 3 pulses in quick succession in order to activate the lock.
If only one or two pulses are received and the third pulse is delayed too long or is missing, the first pulse record is dumped, so no lock action.

So I would ask the TS is the handfob/lock action of the required 3 presses, stated in the operating notes or is it something that has happened over time.??

The other possible cause is the fob push button contacts maybe worn, so two or three presses are required.
If that was the case, fixing the fob push button would be the simplest repair.

 

If you can put a PCB between the 1 pusle source and the door solenoid, then yes it is possible. You will need 1 MCU. The MCU receives the 1 signal and then sends 3 signals. A simple PIC10F200 will do. This means the voltages have to be 5VDC for the MCU, or you will need some converter before and after.

 

So I would ask the TS is the handfob/lock action of the required 3 presses, stated in the operating notes or is it something that has happened over time.?

Yes, the TS should clarify this.

He stated that

the problem is the car being old requires 2 or 3 pulses to actually lock or unlock the door.

so I assumed that it was a functional problem with the door lock, thus his request for the automatic generation of 3 pulses.

 

I see also that he says, its an old car, so my best guess would be the hand fob switch is worn.
If I am correct, changing the received pulse length would not fix the problem.