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#include <OneWire.h>
#define trig PD3
#define echo PD4
long distance = 0; int count = 0;
// ISR For Timer
ISR(TIMER0_COMPA_vect){
//set count depending on tcnt0 and the prescaler
if(count == 96){ count = 0; TCNT0 = 0;
digitalWrite(trig, HIGH); // ... wait for 10 µs ...
delayMicroseconds(10); // ... put the trigger down ...
digitalWrite(trig, LOW);
PCICR |= 0b00000100; PCMSK2 |= 0b00010000; } else { count++; } }
//ISR for PCINT20
ISR(PCINT2_vect) { distance = pulseIn(echo, HIGH); PCICR &= ~0b00000100; PCMSK2 &= ~0b00010000; delayMicroseconds(10); }
long calculateDistance(){ return (long) (((float) distance/ 58.0)); }
int16_t dallas(int x, byte start){ OneWire ds(x); byte i; byte data[2]; int16_t result;
do{ ds.reset(); ds.write(0xCC); //skip Command
ds.write(0xBE); //Read 1st 2 bytes of Scratchpad
result = 0; for(i = 0; i < 2; i++){ data[i] = ds.read(); result += data[i]; }
result = result/2; ds.reset(); ds.write(0xCC); ds.write(0x44, 1); //start conversion
if(start){ delay(1000); } } while(start--); return result; }
void initS(){ TCNT0 = 0; // reset timer
TCCR0A |= 0b00000010; TCCR0B |= 0b0000011; //set prescaler to 64 becasue 256 does not work
OCR0A = 255; TIMSK0 |= 0b00000010; sei(); }
void setup(){ Serial.begin(9600); dallas(2, 1);
// Initializing Trigger Output and Echo Input
pinMode(trig, OUTPUT); pinMode(echo, INPUT);
// Reset the trigger pin and wait a half a second
digitalWrite(trig, LOW); delayMicroseconds(500);
initS(); }
void loop(){
long run_time = micros();
Serial.print("Temperatur: "); Serial.println(dallas(2, 0));
Serial.print("Distanz: "); Serial.print(calculateDistance()); Serial.println("cm"); run_time = micros() - run_time; Serial.print("Zeit für Durchlauf: "); Serial.println(run_time); Serial.println(); delay(1000);
}
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