Im new here, sorry i dont have electronics background but i have a little knowledge in programming.
I just want to start a new thread to guide me on my project.
im planning to have a car fuel cutoff using arduino.
would this be possible? what do i need?
Car Door indicator light -> once openned -> it will trigger the arduino to shutdown/cut fuel line power.
what do i need? what kind of arduino as i search there were different versions.
some questions:
how could the 12v(??) door indicator light can trigger the arduino program, do i need some other device beside arduino and wires from car
once the arduino is triggered, how could i cut the 12v fuel line of the car, do i need some component again after the arduino?
thanks
once the fuel line is cut off, i will have a secret button to actually turn it on again, or i will put a sequence, let say on the third tap of the button the line will turn on.
thanks for the reply.
Yup, im planning to create some sort of security module
That everytime the door will be opened, the arduino will kill the fuelline..
Im also worried about what you mentioned that it is hard to restart a fuel injected or carb system once it starved fuel. There kaybe some instance that i will forgot to engage the power line again.
Also, is arduino prone to malfunction with my planned project??
What do i need to tap on door indicator to send signal/triggers once it changes state..
Btw, i can also put the system to engage the horn instead and make some noise..
You can use a relay to kill the fuel pump. An SPDT (single-pole-double-throw) relay has normally-open and normally-closed contacts, so you can either energize the relay to kill the fuel, or energize the relay to run the pump, whichever way you like the logic.
I made a car alarm several years ago, and there was either an engine-run or engine-kill wire under the hood. I don't exactly remember the details, but I added a relay to the existing wiring. (I had a service manual with the wiring diagrams.)
The Arduino is a 5V device. You can either find a 5V relay or use a relay driver circuit. For the inputs (door sensors), you can use a [u]voltage divider[/u] to knock-down 12V to 5V. A total resistance of around 10K Ohms should work fine.
Since the 12V power varies a bit, it would also be a good idea to add a pair of [u]protection diodes[/u] along with the voltage divider. (If you have the voltage divider, you don't need the resistor shown in the diagram.
Im also worried about what you mentioned that it is hard to restart a fuel injected or carb system once it starved fuel. There kaybe some instance that i will forgot to engage the power line again.
First, that should only happen if someone steals the vehicle. Second, I don't' think that's a problem... I've run out of gas a few times in my life in a few different vehicles and they've always started-up after adding gas to the tank.
the project is very simple. you can measure the door switch to know if the door is open.
you can output to a relay to kill power to the fuel pump or just operate a solenoid valve.
however, I have opened my door to pick up change that I dropped at a tool booth, or mail that I dropped when getting it from my mail box. I have left the engine running when moving the bicycle out of the way, or the trash can or shopping cart.
I have turned on the car, left, went inside and let it warm up to melt the ice or just get warm.
I have opened the door to drop of papers or stuff at a friends house.
since many of these times, I was not sitting in the car, it would not be possible to check for a driver.
may I also suggest you put in a light to indicate the cut off occurred so that the car owner knows to check for fuel problems and not hours checking for other problems ?
sadly, I knew a kid who took at center out of a distributor cap. Simple part. They towed the car and in the end, put in a new engine because of the inability of the mechanic to figure out the problem.
Hi, does your car have an ECU, or MCU or whatever they like to call the box that controls the motor (TBTCTM), or is it power unit these days?
If you inadvertently trip your fuel cutout, the control unit may see that as a loss of fuel pressure and go into fault mode.
Then you may need to get the control unit reset.
Second, I don't' think that's a problem... I've run out of gas a few times in my life in a few different vehicles and they've always started-up after adding gas to the tank.