Editing Sound sensor (section)

== Responding to the sensor ==

The sensor can be used as an input device to a system which responds to changes in sound level.
The example procedure "Soundmeter" uses the sensor to produce a sound ‘meter’.
The eight digital outputs are used to indicate sound level.
As the volume increases more of the outputs are switched on.

=== Procedure: Soundmeter ===

 REPEAT
 IF SOUND < 255 THEN SWITCH OFF 7 ELSE SWITCH ON 7
 IF SOUND < 224 THEN SWITCH OFF 6 ELSE SWITCH ON 6
 IF SOUND < 192 THEN SWITCH OFF 5 ELSE SWITCH ON 5
 IF SOUND < 160 THEN SWITCH OFF 4 ELSE SWITCH ON 4
 IF SOUND < 128 THEN SWITCH OFF 3 ELSE SWITCH ON 3
 IF SOUND < 64 THEN SWITCH OFF 2 ELSE SWITCH ON 2
 IF SOUND < 32 THEN SWITCH OFF 1 ELSE SWITCH ON 1
 IF SOUND < 0 THEN SWITCH OFF 0 ELSE SWITCH ON 0
 FOREVER

=== How it works ===

The first and last lines of the procedure form a loop which continues until the user escapes from the procedure.
Each line within the loop checks if the sensor reading is below a certain sound level in which case the output is switched off, otherwise it is switched on.