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data transmission over power line of mcu

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aydinkoyuncu

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data transmission over dc supply line

is it posible? I want to transfer data on the same line with power of pic. is there anybody that know anything about this?
 

just an easy idea:

On your power supply side you need a resistor and a differential amp
to measure the current through the supply lines.

On the µC side you connect a port pin to a transistor that will draw some current from the power lines.

thats all for unidirectional communication.


More complicated will be a AC/DC coupling.
DC is your supply voltage, decoupled from the power line with
an inductor.
By using a capacitor you can modulate some high frequency
signals to the supply line.


aOxOmOx
 

This is quite a common thing to do, it's used a lot in fire alarm systems where you have the alarms and sensors powered and controled by two wires. You can get ic's to do the transmission and reception. An easy way to do it is to use a telephone DTMF encoder and decoder, just decouple the micro supply with a nice big inductor and cap.
 

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