What must I do to fix this??

So what I’m trying to do is get a passive buzzer to sound once getting the signal from the knock sensor by knocking on the sensor. I don’t know what I’m doing wrong in the code e.t.c. Someone please help me!

Hi,
Look at the error message in the bottom of your screen! Nothing will work until you get a clean Verify.

You need to define VARIABLES before you use them.

Also you are printing 'val' which is not defined anywhere.

Also delay(200); is 200 Milliseconds not 2

So I am using both the knock and passive buzzer sensor. My goal is to make the passive buzzer sound when I knock the knock sensor.. What are the key lines of code that I'll need???
My Code that I made does it manually without me knocking on it, it already starts to buzz so I want to know how to fix it....

You want to know how to fix some code but you're not going to post that code?

@II_ARDU1N0_II, please do not cross-post. Threads merged.

your code shows >= threshold try flipping the > sign to a < sign. and test the sensor again. that worked for me in the past.