Hi
we are making sound level (decibel) measurement system. when decibel reached to required set point digital output is come but we are facing some issue with sound sensor module. my sound sensor output is TTL but i don't know how to write program for TTL. any one please help me how to write program for TTL signal.
The digital inputs on UNO are TTL compatible, but that doesn’t say much.
You’ll need to study the sound sensor to determine ‘what’ it puts out at the desired sound levels.
Do you have data sheets, existing code you can post here ?
And it isn't actually "TTL" anyway, as it is presumably a 5 V CMOS logic signal - "LOW" is 0 V and "HIGH" is 5 V.
Mind you, when asking questions here, you need to supply proper information - the Web link describing your "sound sensor module" and what other parts (all) such as an Arduino, you are actually using. 
sensor is given above like... how to write TTL logic program for above sensor. sound is greater then 100 db buzzer will come... its my requirement
we are using arduino uno controller
So, did you receive the necessary user manual for this device?
I dnt received any manual...
That is to say the least, going to make things rather difficult! 
Nice sensor.
Google long enough to discover that it uses serial communication for control and data reporting.
To use TTL serial with the Arduino is no problem, see any basic serial comms tutorials or example programs.
To configure, control and read data from the unit will be a matter of thoroughly understanding its protocol and capabilities.
So, yeah, find the full data sheet for it and put your nose down for awhile onto the grinding wheel.
For sale at Amazon, which listing has a good summary of features and how to get at them.
a7
That is a pretty loud buzzer! Do I see a feedback problem? A loud sound triggers the buzzer, which is louder than the sound, so the buzzer never turns off.
Paul
Nah, that's just one way to keep the alarm going after the original offending noise source has been turnt off. 
a7
No, buzzer is kept in another room
https://www.china-encoder.com/ko/product/pr-zs-bz-board-noise-module/
Data sheet for sensor
https://www.china-encoder.com/ko/product/pr-zs-bz-board-noise-module/
Data sheet for sensor
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