Title: PWM RF control remote Post by: machine on October 17, 2008, 02:06:28 02:06 Hello guys, i try find pwm rf control remote circuit, but failed. Anybody know?
Thanks! Title: Re: PWM RF control remote Post by: dennis78 on November 14, 2008, 10:46:58 22:46 Can you explain what you want exactly?
Title: Re: PWM RF control remote Post by: Ikaros on December 02, 2008, 08:41:37 20:41 What do you want? Ready made project or you have a project not working?
PWM with PIC is quite easy. All you need is a resistor and a Capacitor to have clean DC output. Title: Re: PWM RF control remote Post by: LazBoy on December 03, 2008, 06:57:22 06:57 What do you want? Ready made project or you have a project not working? PWM with PIC is quite easy. All you need is a resistor and a Capacitor to have clean DC output. @signalcom How can we generate 60 kHz PWM with 16F876 or 16F877 @20 MHz Clock ? This is possible ? Title: Re: PWM RF control remote Post by: Ikaros on December 03, 2008, 09:29:28 09:29 For 78.12Khz you have to set Timr Prescaler to 1, PR2 at 0x3F with mx resolution 8 bits. With 10 bits you will get max 19,53KHz only.
Title: Re: PWM RF control remote Post by: titi on December 03, 2008, 05:53:42 17:53 This link can help you:
http://www.micro-examples.com/public/microex-navig/doc/097-pwm-calculator.html (http://www.micro-examples.com/public/microex-navig/doc/097-pwm-calculator.html) To Have 60Khz with 20MHz,it give not the exact fréquency you want: (60240.96 Hz) /* * PWM registers configuration * Fosc = 20000000 Hz * Fpwm = 60240.96 Hz (Requested : 60000 Hz) * Duty Cycle = 50 % * Resolution is 8 bits * Prescaler is 1 * Ensure that your PWM pin is configured as digital output * this source code is provided 'as is', * use it at your own risks */ PR2 = 0b01010010 ; T2CON = 0b00000100 ; CCPR1L = 0b00101001 ; CCP1CON = 0b00011100 ; Best regards. Title: Re: PWM RF control remote Post by: machine on December 03, 2008, 07:53:11 19:53 Well, it would be a circuit that controlled a DC motor via RF using a PWM.Well, it would be a circuit that controlled a DC motor via RF using a PWM.
Title: Re: PWM RF control remote Post by: Ikaros on December 04, 2008, 08:38:25 08:38 Here is a little utility that helps alot in PIC calculations from Steve Monfete.
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