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| | | PicPuter 2.0 : Using the Pulse Width Modulators |
Initial PWM docs.
 Using Radio Controlled Servos |
Each of the 4 PWN can be used to control a radio control servo. Such servos require a pulse with a width from 0.5 uS to 1.5 uS. Servos run at 5V but require a lot of power, especially under load, you should not try to power a servo using a small voltage regulator such as the on on the
PicPuter1 board. Use a separate voltage regulator for powering the motor of your servo.
Since PicPuter switches 12 times a uSecond, you get 12 positions for your servo. Moving a servo is as easy as changing PW0 from 6 to 7. The PP0 variable should be set to 255, and the PW0 should range from 6 to 18.
| Making Music |
The Pulse Width modulators can also be used to make simple sounds.
The frequency of a note is determinened by the fomulula frequency = (440/32) * (2 ^ ((midi_note_number-9)/12) )
while the frequency of the PWM is determined by yhe formula tick = 1/12000 second frequency=1/(x*tick)
more later. |
