Sorry, I couldn't find a more descriptive Title.
I have a home (everybody does, ), and an entrance corridor (around 6m wide). Whenever someone walks across it towards the door, I want to ring the bell. Whenever someone leaves the house out through the corridor, I want to sound a different bell / do nothing.
In short, I want a beam break detector with direction sensing. I am pretty optimistic that Direction Sensing Can be easily done with uC interface using two simple beam break detector. Direction can be worked out from the chronology of beam break.
So, actually, I just want suggestion for a reliable, Beam Break Detector, to be used outdoor. (The corridor is outdoor)
I searched around a saw some methods.
1. Using laser diodes and Photo-transistor / LDR. However, I am concerned with the safety, so don't think Laser would be suitable.
2. Using a simple, IR LED/ Photo Diode pair. But, I don't think it can provide 6m distance out door, and I am also concerned with its immunity to ambient light.
3. Using IR LED Transmitting circuit and TSOP reciever ICs. Don't know if it can work.
Any suggestion please.
I have a home (everybody does, ), and an entrance corridor (around 6m wide). Whenever someone walks across it towards the door, I want to ring the bell. Whenever someone leaves the house out through the corridor, I want to sound a different bell / do nothing.
In short, I want a beam break detector with direction sensing. I am pretty optimistic that Direction Sensing Can be easily done with uC interface using two simple beam break detector. Direction can be worked out from the chronology of beam break.
So, actually, I just want suggestion for a reliable, Beam Break Detector, to be used outdoor. (The corridor is outdoor)
I searched around a saw some methods.
1. Using laser diodes and Photo-transistor / LDR. However, I am concerned with the safety, so don't think Laser would be suitable.
2. Using a simple, IR LED/ Photo Diode pair. But, I don't think it can provide 6m distance out door, and I am also concerned with its immunity to ambient light.
3. Using IR LED Transmitting circuit and TSOP reciever ICs. Don't know if it can work.
Any suggestion please.