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Day 25: Python, Graphing, 3D Visualization and Inertial Measurement

Python


Arduino Code

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 Code

import serial #Import Serial Library

arduinoSerialData = serial.Serial('com3',9600) #Create Serial port object called arduinoSerialData
while (1==1):
    if (arduinoSerialData.inWaiting()>0):
        myData = arduinoSerialData.readline()
        print myData

#Use run module

Visualization

 

Python Code

This program used the same Arduino code as example 1.1, but a different python code

import serial #Import Serial Library
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))
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 #Change the length of your measuring rod

Visualization including Labels



Visualization including Target Object

In addition to adding a target object, we also learned that right clicking in the graphics window allows us to rotate the camera view.
We also learned to turn the cylinder vertically by setting the axis to (0,1,0), like so:
measuringRod = cylinder(axis=(0,1,0), radius= .5, length=6, color=color.yellow, pos=(-3,0,0))



Graphing in VPython

Exercise

Creating Multiple Graph Windows

gdisplay can be used to set the size, position, and title for the title bar of the graph window, titles for x and y axes, and specify maximum values for each axis.

MPU-6050 Inertial Measurement Unit (IMU)



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