For Transmitter side
give the output of gas sensor to microcontroller.
then give output of microcontroller to DTMF encoder
DTMF encoder output is given to FM transmitter
For Receiver side
FM receiver output is given to DTMF decoder
then give output of decoder DTMF to microcontroller
give the output of microcontroller to buzzer or display
or else you can give output of decoder directly to buzzer
For Transmitter side
give the output of gas sensor to microcontroller.
then give output of microcontroller to DTMF encoder
DTMF encoder output is given to FM transmitter
For Receiver side
FM receiver output is given to DTMF decoder
then give output of decoder DTMF to microcontroller
give the output of microcontroller to buzzer or display
or else you can give output of decoder directly to buzzer
i have found some transmitter and receiver module in the market ..
but the max frequency is 433Mhz..
i scared that it will be blocked by the object in between the distance..
any advice for me??
I have a single component, low cost, solution using sound wave trough the building structure for transmission of lower level leaks, and a physical high intensity signal for more critical ones.
A candle.
Any open flame generation apparatus could be used, but would probably not be as reliable. A large, parafin, slow burning model could last for several month at a time between inspections/replacement for a really low price. Functionality is guaranteed with a clear and esthetically pleasing visual indicator at the top of the sensor.
If the place vibrates, or gets structuarally challenged, users would be informed there was a gas leak.