Can't make sense of that, it's missing some important words.no model car the garage in a building
That placement might be troublesome with dirt.place an IR LED on the floor and an IR sensor in the ceiling
thxx for your replay am to trying to detect if a car is parked within a car space in a multi car garage in shopping center in each garage i need a sensor to detect if there is a car or not which the perfect kind of IR sharp sensor i perfect to detect that ???Firstly you need to supply more information. The more detailed your question the more detailed the responses will be.
Are you trying to detect if a car is parked within a car space in a multi car garage (shopping centre or apartment complex) or a single car at home? Either way I would place an IR LED on the floor and an IR sensor in the ceiling. when a car parks over the LED it will break the beam and deactivate the sensor.
Have a think about that and see what you can come up with. When you have some ideas we maybe able to help more.
Oh gee thanks for that new knowledge (Oscillators and inductance), now I have more stuff to research on the internet... (Will this never end???, my brain is sooo tired...)10 spaces and something like 1 LED to light up if there's a car in that spot?
Since this is a project I guess you can't assume dirt as the parking surface, but can we assume a roof over it?
I like the ultrasonic idea but there again it would be dirt and water on the floor and the necessity of a roof overhead being the only way to avoid that.
I really think I'd consider my idea of buried sensor loops identical to how they trip most stop lights at intersections. It's practical for a parking garage to get a "slot cutter" that would allow the wires to be buried in the parking surface and all run to a central location.
In essence the way these circuits work is by utilizing the loop of wire as the inductor in a simple colpitts oscillator. When a car parks over the loop the metal of the car increases the effective inductance of the loop thus inducing a fairly decent change in the oscillator's frequency. Since the frequency would go lower you should be able to use a simple 555 missing pulse detector to sense the difference and trigger the LED on.
the led is for each garage in each slot...10 spaces and something like 1 LED to light up if there's a car in that spot?
Since this is a project I guess you can't assume dirt as the parking surface, but can we assume a roof over it?
I like the ultrasonic idea but there again it would be dirt and water on the floor and the necessity of a roof overhead being the only way to avoid that.
I really think I'd consider my idea of buried sensor loops identical to how they trip most stop lights at intersections. It's practical for a parking garage to get a "slot cutter" that would allow the wires to be buried in the parking surface and all run to a central location.
In essence the way these circuits work is by utilizing the loop of wire as the inductor in a simple colpitts oscillator. When a car parks over the loop the metal of the car increases the effective inductance of the loop thus inducing a fairly decent change in the oscillator's frequency. Since the frequency would go lower you should be able to use a simple 555 missing pulse detector to sense the difference and trigger the LED on.