Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: brightjoey on November 11, 2010, 10:25:00 AM
-
HIE robot friends!
I'm going to create a very simple robot that can follows light . I checked around youtube with alot of examples and most of them look very impressive.
So I went out to buy some light sensors and asked around in electronic shops and what they only shown me was some photocell/phototransistor that cost like 1/2$ and the range looks so pitiful, sensing light only when a light source is about 5cm away. I wanna know any other kind of light sensor that can sense even further, preferably 1m away?
-
A standard LDR (Light Dependent Resistor) makes a decent light sensor, is inexpensive and is most likely what you are looking for. You can pick up this 5-pack (http://www.radioshack.com/product/index.jsp?productId=2062590) for about $3 from your local Radioshack if you live in the US. You can also search online stores such as Digi-Key (http://www.digikey.com/), Mouser (http://www.mouser.com/), or others for photoresistors. This randomly selected photoresistor (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PDV-P9004-ND) from Digi-Key (http://www.digikey.com/) is about $1.58.
-
A standard LDR (Light Dependent Resistor) makes a decent light sensor, is inexpensive and is most likely what you are looking for. You can pick up this 5-pack (http://www.radioshack.com/product/index.jsp?productId=2062590) for about $3 from your local Radioshack if you live in the US. You can also search online stores such as Digi-Key (http://www.digikey.com/), Mouser (http://www.mouser.com/), or others for photoresistors. This randomly selected photoresistor (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PDV-P9004-ND) from Digi-Key (http://www.digikey.com/) is about $1.58.
This was the one I looked from the local electronic shop and the shop owner shown me it connect wif a circuit with an LED, and I can't see a significant change on the range of the sensor, I don't mind paying more(not that I want to, but if I must) if the sensor can sense really really far away light source. Or is there any other alternative? As long as It can sense a far away light source in a dark environment I'm happy.
-
If you are trying to detect a small, far away light source then use a lens (telescope) to amplify the distance light.
Try google search on "optical communications receiver".
-
Hi,
This was the one I looked from the local electronic shop and the shop owner shown me it connect wif a circuit with an LED, and I can't see a significant change on the range of the sensor,
The sensitivity can be very low if not used correctly and it's hard to discuss a circuit that you don't know (or how it was used), so let's forget about that.
LDR's can be very sensitive if used properly.
[...] if the sensor can sense really really far away light source.
Well, the sun is really really far away ;)
You have to define things a bit more precise, so how bright is the source and how far away is it?
Or is there any other alternative? As long as It can sense a far away light source in a dark environment I'm happy.
How dark? ;)