Loz2212:
Thank you Robin. I have used 3 sketches I found online, these are not mine at all lol.A PIR sensor, temperature sensor and microphone. Each one runs individually..
But you have not told us exactly what each of them does.
I'm unsure what you mean by global.
A global variable is one which is defined outside any function and is then available everywhere throughout the program. A local variable is one that is defined inside a function and consequently cannot be used outside the function.
For this sort of question Google is your friend.
...R