Servo Control Using Analog Signal Obtain “analog” input using analogRead().

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Presentation transcript:

Servo Control Using Analog Signal Obtain “analog” input using analogRead().

Conversion of Analog to Digital Obtain “analog” input using analogRead(). analogRead() returns a value between 0 (if pin at ground) and 1023 (if pin at 3.3 V). Argument of analogRead() is the pin to read (only pins labeled ANALOG IN can be used).

Pulse Width Modulation (PWM)

100%

Pulse Width Modulation (PWM) 0% On the chipKIT there are 490 periods per second. Use analogWrite(pin, value) to control the duty cycle on a pin. The value must be between 0 and 255. The pin must be one of the underlined pins.

Pulse Width Modulation (PWM) If you take the average value over one period, you can think of the voltage as being between 0 V (0% duty cycle) and 3.3 V (100% duty cycle). There are 256 different voltage levels. Can demonstrate this with an LED attached to pin 9 and the example sketch Fading.

Pulse Width Modulation (PWM) Upload example sketch Fading for this circuit.

Pulse Width Modulation (PWM) Write sketch led_with_potentiometer for this circuit.

Pulse Width Modulation (PWM) Write sketch led_with_inc_and_dec for this circuit.