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ATTiny 85

morbee

Hi Guy's,

 

I have a little alarm i am trying to put together that consists of a HC SRO4 distance sensor and a Piezo Buzzer. wiring this up to the arduino is straight forward and the code is fairly straight forward as can be seen below.

My Question is which pins would i connect to on an ATTiny 85 once i have programmed it with this code?

 

*/

 

 

#define trigPin 13

#define echoPin 12

#define buzzer 11

 

 

 

 

void setup() {

 

 

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

  pinMode(buzzer, OUTPUT);

 

 

}

 

 

void loop() {

  long duration, distance;

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);

//  delayMicroseconds(1000);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  distance = (duration/2) / 29.1;

  if (distance < 50) {  // This is where the buzzer On/Off happens

    digitalWrite(buzzer,HIGH);

}

  else {

    digitalWrite(buzzer,LOW);

   

   (distance >= 200 || distance <= 0);}

  }

  • Use this instead:

     

    #define trigPin 2

    #define echoPin 1

    #define buzzer 0

     

    It will use pin 5 as pin 0, pin 6 as pin 1, and pin 7 as pin 2, although for pin 2 you may have to burn the fuses differently.52713d5b757b7fc0658b4567.png

  • in reply to snu

    Hello Henry,

     

    Thank you very much for your reply and i will change my code to what you have suggested.

    I am newbie to the world of electronics and have started up with it as a hobby more than anything else. Please could you explain the meaning of burning the fuses for pin 2 differently. I am sure if i understand what you mean by this i can try and figure this out.

     

    Kind Regards

  • Hi Guys,

    Thank you to Henry for putting me on the right track and i now understand the method for programming ATTiny.

     

    I have a little yorkshire terrier that insists on sneaking out the back courtyard gate and going walkabout. I decided i would make a door entry alarm for when he pulls this stunt and came up with the idea of using a distance sensor and piezzo buzzer.

    I know it is very simple, but for a complete novice like myself it was quite daunting (the ATTiny aspect of the build) and has taught me a lot in 2 days.

     

    I would like to share my code and the wiring instructions for anyone that might be interested in using it.

     

    /*

    HC-SR04 Ping distance sensor and Piezzo Buzzer wired up to ATTiny85

     

     

    HC-SRO4

    VCC to Pin 8

    0V to Pin4

    Trigger to Pin 2

    Echo to Pin 3

     

     

    Piezzo

    Vcc to Pin 0

    0V to Pin4

     

     

    */

     

     

    #define trigPin 2

    #define echoPin 3

    #define buzzer 0

     

     

     

     

    void setup() {

     

     

      pinMode(trigPin, OUTPUT);

      pinMode(echoPin, INPUT);

      pinMode(buzzer, OUTPUT);

     

    }

     

     

    void loop() {

      long duration, distance;

      digitalWrite(trigPin, LOW);

      delayMicroseconds(2);

      digitalWrite(trigPin, HIGH);

      delayMicroseconds(500);

      digitalWrite(trigPin, LOW);

      duration = pulseIn(echoPin, HIGH);

      distance = (duration/2) / 29.1;

      if (distance < 80) { 

        digitalWrite(buzzer,HIGH);

     

    }

      else {

        digitalWrite(buzzer,LOW);

      

      }

     

      delay(500);

    }

     

    Regards Alex

  • in reply to morbee

    Use AVRdudess and the Arduino as ISP setup or your own AVR programmer. There's a fuse calculator in AVRdudess. I will gladly find the fuse setup for you if you want, but first try programming the chip and see if pin D2 works.

  • in reply to snu

    Hi Henry,

    Thanks for the feedback, I have used my arduino as the programmer using pins 2 (Trigg), 3 (Echo) and 0 for the buzzer. ATTiny is now programmed perfectly and working as i planned.

  • in reply to morbee

    Glad to hear it! Very creative project.