the below link is about making a 'laser communicator': Chapter 7: Light and Optics
After looking at it, I thought, now that i am playing with ultrasonics so it is better to go and do the same job with ultrasonics sensors.
Wanted to know if it is possible to transmit a 1.5khZ beep sound via an ultrasonic sensor(40kHz)? My sensor's bandwidth is almost 3kHz so there would not be any problem caused by bandwidth for that 1.5 kHz signal. I want to send it by the the T sensor and then receive it by R sensor and finally hear that 1.5kHz by a headphone.
The problem is that I don't know the ways to do so?
The only way I know is modulating that 1.5kHz signal with a 40kHz as based frequency and then demodulate it in the receiver(i.e R sensor circuitry)
Do you know another way doing the job?
which kind of modulation is the best to go for?
According to FM don't you think a chip is able to do it easily?
So why it would be difficult?
What do you mean by interference? Interference with what?
An AM detector is just a diode and a small capacitor. But flashes of light and bursts of IR (sunlight) cause interference with IR AM.
An FM detector is the phase detector of a CD4046 phase-locked-loop IC.
An AM modulator is a simple transformer or a transistor.
An FM modulator is a voltage-controlled-oscillator in a CD4046 phase-locked -loop IC.