Make: Wearable Electronics, 2nd Edition

164 Make: Wearable Electronics

To accomplish this, there is a very useful Arduino function called map(). It

looks like this:

map(value, fromLow, fromHigh, toLow, toHigh)

In this function, value is the value you would like to map, fromLow and

fromHigh are the low and high end of the original data set, and toLow and

toHigh are the low and high values of the mapped data set. If you were

to map the full range of analog input (0–1023) to the full range of analog

output (0 to 255), you’d use the following line of code:

map(lightSensorValue, 0, 1023, 0, 255)

A complete sketch looks something like this:

/*

Make: Wearable Electronics

Mapping example

*/

// initialize ...