Futterama
Member
Hello all,
I'm new to this forum, but I started with a search for my topic, but didn't find anything usefull to me.
I want to build a sensor, that detects the presense of a RC controlled car in motion, to determine the speed of the car. There will be 2 sensors with a certain distance, providing a PIC with a wired signal, telling the car has passed - the PIC will then calculate the speed from the time between signals from the sensors and the distance between the sensors.
I have access to IR emitters and photodiodes:
IR emitter 880NM 5mm 100mA
IR detector 880NM 455KHZ
I have no datasheet for the emitters, but I do have one for the detector, you can find it here:
**broken link removed**
I don't know how these things work, but I think that the photodiode detector will conduct current when it's exposed to infrared light with a wavelenght of 880nm. I'm not sure what the frequency of 455KHz means, or which pins are anode and cathode.
I'm thinking of 2 ways to build my setup:
1. A proximity detector type, that detects a nearby object (the RC car) where the emitter and detector are placed side-by-side.
2. A burglar alarm type, that detects the absense of the infrared beam i.e. when the car "breaks" the beam - the emitter will have to be placed 2-3 meters from the detector since the RC car will be passing with 50-60mph and the driver should be able to avoid the circuits. The emitter should then have it's own battery supply.
I like no. 1 the most, since it's the easiest setup in the field where the measurement will take place. But I don't know what the range of this could be - it should be at least 1 meter (again, the drivers skills should be comsidered).
I hope you have lots of suggestions with links, circuit drawings and explanations, since I'm a newbie to IR.
Regards,
Futterama
I'm new to this forum, but I started with a search for my topic, but didn't find anything usefull to me.
I want to build a sensor, that detects the presense of a RC controlled car in motion, to determine the speed of the car. There will be 2 sensors with a certain distance, providing a PIC with a wired signal, telling the car has passed - the PIC will then calculate the speed from the time between signals from the sensors and the distance between the sensors.
I have access to IR emitters and photodiodes:
IR emitter 880NM 5mm 100mA
IR detector 880NM 455KHZ
I have no datasheet for the emitters, but I do have one for the detector, you can find it here:
**broken link removed**
I don't know how these things work, but I think that the photodiode detector will conduct current when it's exposed to infrared light with a wavelenght of 880nm. I'm not sure what the frequency of 455KHz means, or which pins are anode and cathode.
I'm thinking of 2 ways to build my setup:
1. A proximity detector type, that detects a nearby object (the RC car) where the emitter and detector are placed side-by-side.
2. A burglar alarm type, that detects the absense of the infrared beam i.e. when the car "breaks" the beam - the emitter will have to be placed 2-3 meters from the detector since the RC car will be passing with 50-60mph and the driver should be able to avoid the circuits. The emitter should then have it's own battery supply.
I like no. 1 the most, since it's the easiest setup in the field where the measurement will take place. But I don't know what the range of this could be - it should be at least 1 meter (again, the drivers skills should be comsidered).
I hope you have lots of suggestions with links, circuit drawings and explanations, since I'm a newbie to IR.
Regards,
Futterama