Code for 2 ultrasonic sensors

Question

This is my 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.
int trigPin1=2; 
int echoPin1=3;  
float pingTime1;  //time for ping to travel from sensor to target and return 1
float targetDistance1; //Distance to Target in inches 1
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, 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
  digitalWrite(trigPin1, LOW); //Set trigger pin low
  delayMicroseconds(2000); //Let signal settle
  digitalWrite(trigPin1, HIGH); //Set trigPin high
  delayMicroseconds(15); //Delay in high state
  digitalWrite(trigPin1, LOW); //ping has now been sent
  delayMicroseconds(10); //Delay in low state
  
  pingTime1 = pulseIn(echoPin1, HIGH);  //pingTime is presented in microceconds
  pingTime1=pingTime1/1000000; //convert pingTime to seconds by dividing by 1000000 (microseconds in a second)
  pingTime1=pingTime1/3600; //convert pingtime to hourse by dividing by 3600 (seconds in an hour)
  targetDistance1= speedOfSound * pingTime;  //This will be in miles, since speed of sound was miles per hour
  targetDistance1=targetDistance1/2; //Remember ping travels to target and back from target, so you must divide by 2 for actual target distance.
  targetDistance1= targetDistance*63360;    //Convert miles to inches by multipling by 63360 (inches per mile)
  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);
    
  Serial.println(targetDistance1);
  
  
  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()
        myData=str(myData)
        myData= myData.replace("b'",'')
        myData=myData.replace("\\r\\n'",'')
        if myData<"3":

            print( myData)

When I compile the sketch, it shows no error.But when I run the file in python, output=0.However, when they are run individually, python gives me a valid input.so is this code correct?Also, is there a way to call for the exact c++file in python?Thanks for the help!

Answer 1

You are trying to measure with 2 ultrasonic sensors at once. You cannot do that so easily. You need to measure sequentially for 2 reasons:

1. The ultrasonic sensors might get confused by the others signal
2. You will miss the pulse of the one sensor, while you are reading the pulse of the other via pulseIn().

So the order of actions is like this:

1. Trigger sensor 1
2. Read sensor 1 with pulseIn()
3. Trigger sensor 2
4. Read sensor 2 with pulseIn()