Hey guys,
I'm trying to make a laser trip alarm but i'm having problems designing the receiver.
I want to ASK modulate (with constant '1') the laser beam on some frequency so the receiver's input signal should look like a "clock" signal when the beam hits the sensor and obviously nothing when it doesn't hit the sensor.
I though of using a notch pass filter on that frequency but I'm thinking there must be some better way.
I was thinking of using an oscillator on the receiver and sampling the input signal with it, but what happens if the frequency isn't dead even ?
How do all those IR receivers do it ?
Thanks in advance,
Mike.
I'm trying to make a laser trip alarm but i'm having problems designing the receiver.
I want to ASK modulate (with constant '1') the laser beam on some frequency so the receiver's input signal should look like a "clock" signal when the beam hits the sensor and obviously nothing when it doesn't hit the sensor.
I though of using a notch pass filter on that frequency but I'm thinking there must be some better way.
I was thinking of using an oscillator on the receiver and sampling the input signal with it, but what happens if the frequency isn't dead even ?
How do all those IR receivers do it ?
Thanks in advance,
Mike.
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