I am building a "Custom" Body Control Module for my 67 C10 truck. I am using an aftermarket keyless remote relay with a simple two states, "On" or "Off".
I’m a retired ASE Master Tech, I wish to keep parasitic drain low when the vehicle is locked and shut off. The keyless relay “On” tested at 30mA, while the control side is capable of 15A.
Function #1; Lock signal on 1 sec, then off. With keyless relay off, Un-lock signal 1 sec, then off. Using circuits I’ve seen on this forum have given me ideas for a 100uf to pin 2 with 10k resistor to ground, thus on, then off. I am using one relay for power to lock, while the other is “NC” to ground.
Question? When the supply power is off, how do I trigger second 555 to operate relay #2 to provide un-lock signal. The time off is anyone’s guess as the vehicle sits. With a 555, can it be triggered by sinking to power? I have seen where and LED to LRD could be used to trigger when the light is lost. I am concerned about overheating a 555 depending on its state of trigger.
Function #2; I want to trigger certain lamps “On” and blink twice, then shut off.
I have seen the suggestion of using a “Off delay time delay relay”. My light control circuit is using a 555 with a n-channel MOSFET and diodes in series with each lamp circuit to prevent back feed when normal light functions on vehicle are used.
I enjoy the challenge as the brain is a muscle the needs exercise. It is boring doing the same thing each day.
I have strong electrical diagnostics skills, but this is first time building electronics. Fortunately, I inherited my Grandfathers small part bin with hundreds of components including “And”, “Nand”, “Or” gates, quad drivers and many more as he got his Masters Electrical in 1932, then was in the Army Corp of Engineers and spent 7 years in the 60’s as chief electrical inspector for the Meck Island minute-man missile site in the Marshall islands.
Any suggestions welcome. We can tackle one thing at a time. Thanks!
I’m a retired ASE Master Tech, I wish to keep parasitic drain low when the vehicle is locked and shut off. The keyless relay “On” tested at 30mA, while the control side is capable of 15A.
Function #1; Lock signal on 1 sec, then off. With keyless relay off, Un-lock signal 1 sec, then off. Using circuits I’ve seen on this forum have given me ideas for a 100uf to pin 2 with 10k resistor to ground, thus on, then off. I am using one relay for power to lock, while the other is “NC” to ground.
Question? When the supply power is off, how do I trigger second 555 to operate relay #2 to provide un-lock signal. The time off is anyone’s guess as the vehicle sits. With a 555, can it be triggered by sinking to power? I have seen where and LED to LRD could be used to trigger when the light is lost. I am concerned about overheating a 555 depending on its state of trigger.
Function #2; I want to trigger certain lamps “On” and blink twice, then shut off.
I have seen the suggestion of using a “Off delay time delay relay”. My light control circuit is using a 555 with a n-channel MOSFET and diodes in series with each lamp circuit to prevent back feed when normal light functions on vehicle are used.
I enjoy the challenge as the brain is a muscle the needs exercise. It is boring doing the same thing each day.
I have strong electrical diagnostics skills, but this is first time building electronics. Fortunately, I inherited my Grandfathers small part bin with hundreds of components including “And”, “Nand”, “Or” gates, quad drivers and many more as he got his Masters Electrical in 1932, then was in the Army Corp of Engineers and spent 7 years in the 60’s as chief electrical inspector for the Meck Island minute-man missile site in the Marshall islands.
Any suggestions welcome. We can tackle one thing at a time. Thanks!