Jennifer Wilson
New Member
Hi everyone,
I'm making a school project on a car parking sensor that counts the number of cars that will go in or out of a car park (22 cars max). I know that there are several other threads for similar things like this but they have not been overly helpful. There will be 2 IR sensors on a single entrance/exit. I am unsure on how I will be able to tell my circuit whether a car has entered or exited, such as when the car passes sensor A then B to enter, and passes sensor B then A to leave. There are a number of chips that ive been researching, such as 4010, 4510, 4026, 4017 but I was wondering which would be best. I know that for some I need a decoding chip afterwards to allow the seven segment display to work. My idea is that if there are spaces in the car park, a number of LEDs in the shape of a tick will latch on, and if there are 22 (no spaces left available) a cross made from LEDs turns on. I was thinking of using some sort of bistable for this that used logic gates like NAND and AND which are connected to some of the 7 segment display outputs which means I can latch the tick or cross on. I have also been told to use some type of barrier to prevent any more cars entering, which would mean a relay (possibly transistor relay) would need to be used but this presents the problem of the IR sensors whereabouts such as they wont work if placed one on either side, or both on one side. If you were wondering, I am not allowed to use microcontrollers (programmable chips). My project is just in the research stage at the moment but some advice and help would be greatly appreciated. Also my knowledge in electronics is decent, I am nowhere near an expert in this
Thanks x
I'm making a school project on a car parking sensor that counts the number of cars that will go in or out of a car park (22 cars max). I know that there are several other threads for similar things like this but they have not been overly helpful. There will be 2 IR sensors on a single entrance/exit. I am unsure on how I will be able to tell my circuit whether a car has entered or exited, such as when the car passes sensor A then B to enter, and passes sensor B then A to leave. There are a number of chips that ive been researching, such as 4010, 4510, 4026, 4017 but I was wondering which would be best. I know that for some I need a decoding chip afterwards to allow the seven segment display to work. My idea is that if there are spaces in the car park, a number of LEDs in the shape of a tick will latch on, and if there are 22 (no spaces left available) a cross made from LEDs turns on. I was thinking of using some sort of bistable for this that used logic gates like NAND and AND which are connected to some of the 7 segment display outputs which means I can latch the tick or cross on. I have also been told to use some type of barrier to prevent any more cars entering, which would mean a relay (possibly transistor relay) would need to be used but this presents the problem of the IR sensors whereabouts such as they wont work if placed one on either side, or both on one side. If you were wondering, I am not allowed to use microcontrollers (programmable chips). My project is just in the research stage at the moment but some advice and help would be greatly appreciated. Also my knowledge in electronics is decent, I am nowhere near an expert in this
Thanks x