ANALOG READ• One of the Arduino Uno digital pins is

connected to an input analog device.

• We want to know what value the device is

reading (e.g. a sensor for distance).

• Use the analogRead function to do so.

• ReadVar = analogRead (pinVar).

ANALOG READ• The analog read function returns a value

between 0 and 1023.

• To get a useful value, we want the value read

to be consistent with the range of the device.

• Use the map function:

SensorVal = map (ReadVar, 0 , 1023, x, y).

ANALOG READIn this example,

the sensor range

is from 3cm to

100 cm.

ANALOG WRITE (PWM)• PWM stands for Pulse Width Modulation.

• PWM enables controlling the “intensity of the

output”.

• Devices for analog output can only be connected to

(~) marked pins on Arduino Uno: 3, 5, 6, 9, 10, 11

ANALOG WRITE (PWM)• In this case, there is no need to declare the

pins as outputs in the setup.

• The function used: analogWrite (pin, Value);

• “Value” must be between 0 and 255.

• 0 means no output potential.

• 255 means maximum output potential.

ANALOG WRITE (PWM)

ANALOG WRITE (PWM)

ANALOG WRITE (PWM)

ANALOG WRITE (PWM)

ANALOG WRITE (PWM)