pySerial and Arduino communication

Question

So far, I was exploring Python with Arduino using pySerial. I made some projects where pySerial reads something from the serial port.

import serial 

arduinoSerialData = serial.Serial('com11',9600) #Create Serial port object called arduinoSerialData


while (1==1):
    if (arduinoSerialData.inWaiting()>0):
        myData = arduinoSerialData.readline()
        print (myData)

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.
}

For now, my code looks something like this. How can I make use of my ultrasonic sensor in Python and send signals to my Arduino program? In other words, can I make my Arduino file read from the Python file that I have or it is only one direction?

busybear busybear · Accepted Answer · 2018-06-26T14:54:11

pySerial allows for communication over serial in both directions. On the Arduino side, you need to call Serial.read where appropriate to read data stream from Python. In Python, you just need to send data using the function serial.write. If using Python 3, input to serial.write needs to be in byte format.

pySerial and Arduino communication

1 Answers