Not sure where to start with radars

[RADAR]

Hi guys! The name is Tim! I'm trying to figure out how to build something with radars. I'm trying to build a device where a radar will send a signal when something is within 8 feet of it, (give or take), and it will send off a signal that will ring a bell. Now I understand how to get a complete circuit to get a bell to ring, but I have no idea where to start with the radar. I see radar's on ebay, (dopler, etc.), but I want one that will only go off when something is within a certain distance from it. Does anyone know how I can integrate that altogether with the bell? Any help is appreciated! Thank you!

 

[(*steve*)]

I would advise you to look at one of the ultrasonic range finger modules. Timing house long it takes for sound to travel 16 feet is easier than doing the same for light.

 

[alex Chiu]

I passive infra red sensor may be more suitable in your application. Radiation need more power and if always affected by number and size of objects surround.

 

[Gryd3]

Sensor choices will vary depending on the environment.
Ultrasonic Ping sensors do great, but may not be as accurate when dealing with softer objects that may absorb the sound.
Same thing with Active IR... they typically work at a smaller range, but will also be affected by the color of the object that it relies being relected against.Perhaps you can give more details into where the object will be and where the subject or objects to be detected will be?

 

[RADAR]

Thanks for the help, guys! I'm trying to make my own blind spot device. I don't plan on using it for any real life applications, but I just want to make one. I'm trying to get it to pick up on cars that are probably an average of 8 feet away. Should I use IR or radar? I want it to detect when a car is within a certain range and ring the bell.

Tim

 

[Gryd3]

Thanks for the help, guys! I'm trying to make my own blind spot device. I don't plan on using it for any real life applications, but I just want to make one. I'm trying to get it to pick up on cars that are probably an average of 8 feet away. Should I use IR or radar? I want it to detect when a car is within a certain range and ring the bell.

Tim

Find a wrecked car with those sensors in it already and rip em out!

 

[KTW]

This is what they look like.
http://www.ebay.com/itm/Crimestoppe...520?pt=LH_DefaultDomain_0&hash=item3cf5daabd8

 

[HellasTechn]

Hi guys! The name is Tim! I'm trying to figure out how to build something with radars. I'm trying to build a device where a radar will send a signal when something is within 8 feet of it, (give or take), and it will send off a signal that will ring a bell. Now I understand how to get a complete circuit to get a bell to ring, but I have no idea where to start with the radar. I see radar's on ebay, (dopler, etc.), but I want one that will only go off when something is within a certain distance from it. Does anyone know how I can integrate that altogether with the bell? Any help is appreciated! Thank you!

When you say RADAR i assume you are not talking about a Microwave transceiver right ? by reading the following posts i dont think so.

Whatever sensor you choose to use you have to keep in mind that either Electro Magnetic (eg rf signals) transceiver or Ultrasonic transceiver are not a good idea to be close to human body at least not for long time due to health hazards. At least i wouldnt risk useing one at home in which i live.

 

[Gryd3]

When you say RADAR i assume you are not talking about a Microwave transceiver right ? by reading the following posts i dont think so.

Whatever sensor you choose to use you have to keep in mind that either Electro Magnetic (eg rf signals) transceiver or Ultrasonic transceiver are not a good idea to be close to human body at least not for long time due to health hazards. At least i wouldnt risk useing one at home in which i live.

While I agree that excess exposure to anything is not good. I emphasys 'excess'.
In the case of these transceivers, that would depend on which ones the op uses (specifically the type, and transmit power).
If you sit at a computer you are probably pretty close to a transmitter for WiFi, and anyone old enough used to sit in front of Cathode Ray Tubes. Of course, many people have at least one cell phone which is with them almost 24/7 which has Cellular, Bluetooth, WiFi and RFID wireless radios.
So please, if you are going to reference general health risks to a wide range of RF or Ultrasonic products, please provide a more detailed explanation as to what specifically should be avoided, or how specifically to use it safely. Without it, you sound like health nut who has sworn off cell phones and WiFi

 

[HellasTechn]

While I agree that excess exposure to anything is not good. I emphasys 'excess'.

Without it, you sound like health nut who has sworn off cell phones and WiFi

Yes i was refering to excessive use.

Also agree with your 2nd point and (sworn off WIFI. That i am).

Any way sorry for the not really usefull post.

 

[Gryd3]

Yes i was refering to excessive use.

Also agree with your 2nd point and (sworn off WIFI. That i am).

Any way sorry for the not really usefull post.

Safety and health is always a good concern, if you have any specifics it would be a good place to put them.