Index
 
  Reference for Wiring 1.0 (ALPHA) 0021+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.
Name  

map()

   
Examples   
int value; 
int m; 
 
void setup() { 
  Serial.begin(9600); 
} 
 
void loop() { 
  value = analogRead(0); 
  m = (int)map(value, 0, 1023, 0, 255); // converts a number in the range 
  Serial.println(m, BYTE);              // 0-1023 to a number in the range 0-255 
  delay(100); 
}

Description   out-of-range values are often intentional and useful.
   
Syntax   
map(value, low1, high1, low2, high2)
   
Parameters  
value   float: The incoming value to be converted
low1   float: Lower bound of the value's current range
high1   float: Upper bound of the value's current range
low2   float: Lower bound of the value's target range
high2   float: Upper bound of the value's target range
   
Returns   float
   
Usage   Application