Hi,
I need an IR sensor that can sense IR light intensity. Essentially what i want to be able to do is get an IR light source (say some led's or a lamp) and be able to have the voltage reading from the sensor vary as the light source moves closer or farther away from the sensor. I am hoping to use a distance of between 0 - 0.5m.
I have tried constructing an IR light sensor using a phototransitor and a resistor connected to a voltage source (as per a previous post), however this is no good as it is only usable at distances between 0 and ~15cm.
Can anyone suggest what i might need to do? is there an off the shelf item that can achieve this? (that is not to expensive)
If not then what should i be using to construct this circuit?
Thanks for your help
I need an IR sensor that can sense IR light intensity. Essentially what i want to be able to do is get an IR light source (say some led's or a lamp) and be able to have the voltage reading from the sensor vary as the light source moves closer or farther away from the sensor. I am hoping to use a distance of between 0 - 0.5m.
I have tried constructing an IR light sensor using a phototransitor and a resistor connected to a voltage source (as per a previous post), however this is no good as it is only usable at distances between 0 and ~15cm.
Can anyone suggest what i might need to do? is there an off the shelf item that can achieve this? (that is not to expensive)
If not then what should i be using to construct this circuit?
Thanks for your help