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Example

DC Fan speed control on ATtiny13 and DS18B20

Rating:

5

Author: Roman Toropov

Last Updated: 2016-02-19

Package Version: 1.0.0.0

Example: 1.0.0.0

Category: Motor Control

Downloaded: 1999 times

Followed by: 3 users

License: MIT license  

Control of fan speed depending on the temperature

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mikroC PRO for AVR
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
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// Roman Toropov
// Termostat source

char duty;
unsigned int temp2write;

void main() {

   DDB0_bit = 1;
   PWM1_Init(_PWM1_FAST_MODE, _PWM1_PRESCALER_1, _PWM1_NON_INVERTED, 0);

  do {
    Ow_Reset(&PORTB, 2);                         // Onewire reset signal
    Ow_Write(&PORTB, 2, 0xCC);                   // Issue command SKIP_ROM
    Ow_Write(&PORTB, 2, 0x44);                   // Issue command CONVERT_T
    Delay_us(120);

    Ow_Reset(&PORTB, 2);
    Ow_Write(&PORTB, 2, 0xCC);                   // Issue command SKIP_ROM
    Ow_Write(&PORTB, 2, 0xBE);                   // Issue command READ_SCRATCHPAD

    temp2write =  Ow_Read(&PORTB, 2);
    temp2write = (Ow_Read(&PORTB, 2) << 8) + temp2write;

  temp2write = temp2write >> 4 ;

// degrees Celsius in decimal form, natural number

  if (temp2write > 37) { duty = (temp2write - 37) * 5 + 20; }

  if (temp2write > 45) { duty = 255; }
  if (temp2write < 38) { duty = 0; }

  PWM1_Set_Duty(duty);

  Delay_ms(3000);

  } while (1);

}

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