Constrains a number to be within a range.
x: the number to constrain, all data types
a: the lower end of the range, all data types
b: the upper end of the range, all data types
x: if x is between a and b
a: if x is less than a
b: if x is greater than b
sensVal = constrain(sensVal, 10, 150);// limits range of sensor values to between 10 and 150
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