hugoender
New Member
Yes, this topic has been covered many times before and yes I have read the posts on IR alarms. However, I still have quite a bit of questions and so I am creating this thread.
I want to make an alarm system that uses two IR LED's. I bought an IR transmitter LED (clear plastic) and an IR detector LED (opaque dark plastic). I want both the transmitter and receiver on the same circuit.
The idea is that the Tx LED sends out short pulses (so I can run more power through the LED without burning it up) and when someone walks in front of it, these pulses bounce back onto the Rx LED that is right next to the Tx LED.
With that said, I was thinking of connecting a 12F PIC or a 555 timer to a transistor and then the transistor to the LED (to run quite a bit of current through the LED to increase distance). Then I would connect the Rx LED to and transistor to amplify the detected signal and trigger a relay or something.
How does this sound? Let me know what you guys think and if you have any suggestions. At this point I don't have any PIR sensors, only two IR LED's.
I would also like to know how I can know if the voltage that is created by the Rx LED is high enough to turn a transistor "on". I have looked at datasheets but I must admit that I am a bit dumb when it comes to reading those things.
Thank you in advance to anyone that helps me out with this.
I want to make an alarm system that uses two IR LED's. I bought an IR transmitter LED (clear plastic) and an IR detector LED (opaque dark plastic). I want both the transmitter and receiver on the same circuit.
The idea is that the Tx LED sends out short pulses (so I can run more power through the LED without burning it up) and when someone walks in front of it, these pulses bounce back onto the Rx LED that is right next to the Tx LED.
With that said, I was thinking of connecting a 12F PIC or a 555 timer to a transistor and then the transistor to the LED (to run quite a bit of current through the LED to increase distance). Then I would connect the Rx LED to and transistor to amplify the detected signal and trigger a relay or something.
How does this sound? Let me know what you guys think and if you have any suggestions. At this point I don't have any PIR sensors, only two IR LED's.
I would also like to know how I can know if the voltage that is created by the Rx LED is high enough to turn a transistor "on". I have looked at datasheets but I must admit that I am a bit dumb when it comes to reading those things.
Thank you in advance to anyone that helps me out with this.