I'll try simulating your relay circuit but I won't be able to do that until Thursday.
I'll try simulating your relay circuit but I won't be able to do that until Thursday.
Your 555 timer diagram is incomplete so am not sure if that works.
Are you aware that the 555 is triggered by a signal going to ground, not a positive pulse? Your circuit seems to assume a positive trigger (the TSSM signal).
Someone could hack that with two hand claps, then if you had a bandpass filter, it could be hacked with a recording on a cell phone. Then beyond this, hack the system wiring even if the relay was secured.
Clearly a 2nd FOB is best for the system Relay to prevent battery loss. Cheap wireless rolling code encryption keyfob with reed relay out to activate system relay. Cheap and dirty.... But not single switch.
The features , cost, complexity with security are all tradeoffs. An upgrade is a new rollingcode keyfob that activates the system and Delphi Tx at the same time both embedded inside the delphi unit with booby trap.
Gee my old pay tv security designs are coming back to me. You could also use biometric finger with serial rolling code to Delphi and system relay reader , to arm all. But Rx must be embedded with I2C interface.
Your circuit shows the TSSM signal controlling a relay directly. Is the TSSM signal able to handle the relay coil current?
How can Relay #3 turn on with the diode in series?
What keeps the Relay #3 on when you get only one TSSM pulse (disarmed) and the timer expires?
I'm reasonably confident that the pulse discriminator circuit I showed will work, but since it's only been simulated and not built, there's no guarantees.
keyfob or passive RFID or secret interrupt to run/stop switch may solve your problem. Bikes are not enclosed like cars.
Where I came from, all cars are insured by the cheapest Govt Auto Insurance in the country. All older cars without secure doors and alarms got free Interrupters under the hood.
I once lost the dongle, which at the time, looked like a pendant on my Mother's keychain for her car but is actually a passive RFID. It turned over but no spark. Even the mechanic could not fix it or get spark. Until I found the broken RFID pendant (epoxy lozenge) and he said sorry I cannot fix it and when I put it near the key entry and turned the key it started and I drove away. But I felt guilty driving away, doh!
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