Question

How many tone() functions can be invoked to run simultaneously on an Arduino Board?

(a) As many pins are present

(b) Infinite number

(c) Only one

(d) Depending on the number of timers present

The question was asked in exam.

Enquiry is from Advanced Input Output in portion Arduino Programming of Arduino

Answer 1

Correct option is (c) Only one

For explanation I would say: The tone() function uses the Arduino’s built in timer to generate the square wave of the necessary frequency. So the number of tone() invokes a board can handle depends upon the number of timers present on that board.