witches »

 

HW-20: Arduino - Motor Speed.problem

Arduino - Measuring Motor Speed

Arduino sketch with corresponding line numbers percoding line.
Match line # 1 through #17 with the corresponding instructionpurpose.
_____________________________________________________________________

1.   int count = 0;
     float f = 0;
     float PPR = 500;
     float RPM= 0;

2.   void setup()
3.      pinMode(2,INPUT);
4.     attachInterrupt(0,freq,RISING);
5.      Serial.begin(9600);

6.    void loop()
      {
7.      count=0;
8.      delay(100);
9.      f=10*count;
10.    RPM=f/PPR;
11.    Serial.print(count);
12.    Serial.print(\" Pulses/100ms\");
13.    Serial.print(\"\t\");
14.    Serial.print(f);
15.    Serial.println(\" Hz\");
       }

16.   void freq()
        { 
17.      count=count++; 
        }

 1 2 3 4 5  Establish inputs andoutputs 
 1 2 3 4 5  DeclareVariables 
 1 2 3 4 5  Establish outputcommunications with the monitor 
 1 2 3 4 5  Declare digitalinput pin 
 1 2 3 4 5  Establish interruptdigital input pin, name and mode 
 Tries 0/2
 6 7 8 9 10  Establish initialcount value within the running program loop 
 6 7 8 9 10  Infinite loop -running program 
 6 7 8 9 10  Calculaterevolutions per minute 
 6 7 8 9 10  Calculatefreqency 
 6 7 8 9 10  Delay 100 ms whilecounting interrupt pulses 
 Tries 0/2
 11 12 13 14 15  Print text\"Pulses/100ms\" to monitor 
 11 12 13 14 15  Print countvalue to monitor 
 11 12 13 14 15  Print text \"Hz\" to monitor then line feed 
 11 12 13 14 15  Print frequencyvalue to monitor 
 11 12 13 14 15  Print tabspacing to monitor 
 Tries 0/2
 16 17  Interrupt subroutine 
 16 17  Add one to the count which isaccumulating the number of pulses in 100ms 
 Tries 0/2