Reading an output in as part of an "If" statement

Using Arduino Programming Questions
#1

Hi all,

This is very probably a simple question but I just can’t get my head around it so here goes,

I want to check the status of an output (OS) as well as the condition of a variable (rpm) before executing the command. Something like this,

if ((rpm < 915) && (digitalRead(OS, = LOW)))

digitalWrite(US, HIGH); // Underspeed Alarm at 915 rpm

This however results in the following error

exit status 1
expected primary-expression before ‘=’ token

any ideas as to what I’m doing wrong?? Many thanks, Bob.

#2 
  if ((rpm < 915) && (digitalRead(OS) == LOW)))
#3

Thanks for you rapid response AWOL, I’ve tried this,

if ((rpm < 915) && (digitalRead(OS) == LOW)))

digitalWrite(US, HIGH); // Underspeed Alarm at 915 rpm

but still have this error,

exit status 1
expected primary-expression before ‘)’ token

what have I missed?

#4

Looks like mis-matched quantity of ( vs ).
I count 4 (, but 5 ).
Try deleting one from the right-hand end.

#5

Brilliant, thanks Crossroads, it had to be something simple, that's all my brain can handle :confused:

#6

If you position the IDE cursor after a bracket of any kind the IDE will show you where the other one of the pair is.

In earlier versions of the IDE you could double click after a bracket and the IDE would highlight the code between them, which was very useful. Sadly some idiot removed this at some point.

#7