The lake was just an example to get a visual as to what I am trying to do. The conversation got lost in addressing the human eye. This application will not be used where an eye can be damaged. But the example application is exactly what I need...a long distance counter system used away from...
I have considered a lens to focus the light on a detector. I have not settled on a laser but have gotten close. A 5mv laser. I have found detectors with filters to help the sunlight but have not heard of one with amp. I am having trouble with how to "trigger" the counter when the beam is...
Just found out from a manufacturer of phototransistors that from 110 yds there will not be enough energy to use the device. Suggested silicon photodetector. So I am back to the small current and op amp circuit to create the 5 volt drop.
No, this not a school project. I am trying to put together a device to count boats on a lake. I am 40. I have been researching op amps and not sure how to set the circuit up. Do I need an op amp at all. Thanks
I want to build a laser counter (counts when the beam is broken) and I am having trouble with the detector side. I can use a photo transistor (or like) but the counter device I have needs a voltage change of 5 volts to trigger the counter. Someone sugested an op amp. But I need help designing...
