Lab 25/ HW 25

Lab 25 (Ultrasonic):

int trigPin = 13; //Sensor Trig pin connected to Arduino pin 13
int echoPin = 11; //Sensor Echo pin connected to Arduino pin 11
float pingTime; //time for ping to travel from sensor to target and return
float targetDistance; //Distance to Target in inches
float speedOfSound = 776.5; //Speed of sound in miles per hour when temp is 77 degrees.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin, LOW); //Set trigger pin low
  delayMicroseconds(2000); //Let signal settle
  digitalWrite(trigPin, HIGH); //Set trigPin high
  delayMicroseconds(15); //Delay in high state
  digitalWrite(trigPin, LOW); //ping has now been sent
  delayMicroseconds(10); //Delay in low state
 
  pingTime = pulseIn(echoPin, HIGH); //pingTime is presented in microceconds
  pingTime = pingTime / 1000000; //convert pingTime to seconds by dividing by 1000000 (microseconds in a second)
  pingTime = pingTime / 3600; //convert pingtime to hourse by dividing by 3600 (seconds in an hour)
  targetDistance = speedOfSound * pingTime; //This will be in miles, since speed of sound was miles per hour
  targetDistance = targetDistance / 2; //Remember ping travels to target and back from target, so you must divide by 2 for actual target distance.
  targetDistance = targetDistance * 63360; //Convert miles to inches by multipling by 63360 (inches per mile)
 
  Serial.println(targetDistance);
  delay(100); //delay tenth of a second to slow things down a little.

}

Python Visual:

import serial #Import Serial Library
from visual.graph import*
from visual import* #Import all the vPython library

arduinoSerialData = serial.Serial('com3', 9600) #Create an object for the Serial port. Adjust 'com11' to whatever port your arduino is sending to.
measuringRod = cylinder( title="My Meter", radius= .5, length=6, color=color.yellow, pos=(-3,0,0))
lengthLabel = label(pos=(0,5,0), text='Target Distance is: ', box = false, height = 30)
target=box(pos=(0,-.5,0), length=.2, width=3, color=color.green)
while (1==1): #Create a loop that continues to read and display the data
    rate(20)#Tell vpython to run this loop 20 times a second
    if (arduinoSerialData.inWaiting()>0): #Check to see if a data point is available
        myData = arduinoSerialData.readline() #Read the distance measure as a string
        print myData #Print the measurement to confirm things are working
        distance = float(myData) #convert reading to a floating point number
        measuringRod.length=distance + 1 #Change the length of your measuring rod last measurement
        target.pos=(-2+distance,0,0)
        myLabel= 'Target Distance is: ' + myData #Create label by appending string myData to string
        lengthLabel.text = myLabel #display updated myLabel