4 different frequency signals in a single channel

[Harish Achar]

hi there,

i have a doubt here, am using a microcontroller and want to generate 4 different frequency signal from a single channel i mean single pin.. is it possible to do this....?
Is there any technology or alternates to do this...?

 

[BradtheRad]

There is the concept that allows myriad sine frequencies to be transmitted in a single wire.

Sum them all together. Amplify as necessary. Transmit.

At the receiving end, install a narrow bandpass filter to extract the various frequencies.

 

[binlch.lv]

microcontroller only can creat digital signal,I don't think you can creat.

 

[doraemon]

Hello!

microcontroller only can creat digital signal,I don't think you can creat.

Probably we don't use the same series. Most of those I know (MSP430, PIC, ARM...) have ADC
and some of them also have DACs.

i have a doubt here, am using a microcontroller and want to generate 4 different frequency signal
from a single channel i mean single pin.. is it possible to do this....?

Your question has already been replied. But you may consider rethinking your design. What would
be the point of generating these waves? A kind of DTMF encoding? Otherwise there might be
other solutions to your problem, so it might be a good idea to explain a little bit more what you
want to do.

Dora.

 

[bigdogguru]

microcontroller only can creat digital signal,I don't think you can creat.

Does a Digital to Analog Converter (DAC) ring a bell?

Some microcontrollers actually have onboard DACs as peripheral modules, even those that do not, can certainly control a DAC with an SPI, I2C or Parallel interface.


BigDog

 

[FvM]

An analog signal generated by pwm at a digital pin can also carry multiple frequencies.

 

[KlausST]

Hi,

many answers....

but I´m missing a lot of input.
* Are the signals sinsoid or square wave or other waveform?
* What are the voltage levels? Are they constant?
* Are the frequencies alternatively or may there be multiple frequencies at the same time?
* What is the purpose of it? What is the reciever?

Klaus

 

[tggzzz]

microcontroller only can creat digital signal,I don't think you can creat.

Understand how a delta-sigma DAC + low pass filter works. Very elegant.