How to conduct data communication on the weak wire

If you want to use the existing wire lines in the room for network communication, you will generally use the power line carrier method to carry out data transmission on the strong wire lines. Now I have come up with a simpler, cheaper and more reliable method, as long as a few discrete devices and two ICs communicate via weak current circuits (such as telephone lines).

The transmission rate of this circuit can reach at least 32kbit / s. If the carrier is higher, the speed can be faster. For simplicity, the key switch we use has no noise reduction function and can be implemented in software if desired. U1 is a PIC microcontroller, equipped with several peripheral devices and a PWM module.

It should be noted that this circuit can only be used in a low-voltage weak current environment, and cannot be connected to high voltage.

How to conduct data communication on the weak wire

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