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Servo Control Using Analog Signal

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).

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Servo Control Using Analog Signal

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

  2. 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 ANALOGIN can be used).

  3. Pulse Width Modulation (PWM)

  4. Pulse Width Modulation (PWM) 100%

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

  6. Pulse Width Modulation (PWM) • If you take the average value over one period,you can think of the voltage as being between0 V (0% duty cycle) and 3.3 V (100% duty cycle). • There are 256 different voltage levels. • Can demonstrate this with an LED attached topin 9 and the example sketch Fading.

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

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

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

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