Sunday, 24 August 2014

arduino - Better resolution with photodiode (LTR-536AD)



I want to build something like a fog-sensor.


I'm using a laser and on the other end (~20m) I have a LTR-536AD photodiode. I hooked the photodiode to an arduino and was monitoring the voltage.


My problem: When there is ambient light the analog reading is ~640. When I hit the sensor with the laser it is about ~620.


How can I increase the resolution?




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