Arduino wait for serial data from Python

Question

I'm new to Arduino, and I'm trying to make a game. I'm sending the serial data with Python to the Arduino. I want to make the Arduino wait untill it recieves the serial data from Python.

My questions are:

Why isn't the Arduino program working with serial data from Python, but it works with data from Serial Monitor?
How can I make the program work with data from Python? (Wait untill serial data from Python, and then save the data.)

Arduino code:

int select;
void setup() {
  Serial.begin(9600);
  Serial.flush();
  while(!Serial.available()){
  }
  if(Serial.available()>0){
    select=Serial.read();
  }
}
void loop() {
  Serial.println(select);
  delay(500);

}

Python code:

import serial
ser=serial.Serial('COM4',9600)
ser.write(b'1235')
ser.close()

Solved the problem that I don't get the serial data, but a new problem occured:

The problem is that, if I get the serial data, my Arduino program jumps back to the while(!Serial.available()){} loop, and not goes to the void loop(){}.

Juraj · Accepted Answer · 2018-11-11 09:06:58Z

0

A new USB connection with ser=serial.Serial('COM4',9600) resets the Arduino. The data sent right after connection are lost because the Arduino boots.

answered Nov 11, 2018 at 9:06

Juraj

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2 Comments

K.Kovács Over a year ago

Now I get the serial data with the Arduino, but there is one problem, when I get the data the arduino program jumps back this loop: while(!Serial.available()){}, and not to void loop(){}.

Juraj Over a year ago

every time you invoke serial.Serial('COM4',9600) the Arduino resets

Bob R · Accepted Answer · 2018-11-11 09:12:47Z

0

Like Juraj says that resets the Arduino you should add code to wait for it to come back up

import serial
ser=serial.Serial('COM4',9600)
sleep(.5)
if arduino.is_open == 1:
        print("open")
ser.write(b'1235')
ser.close()

answered Nov 11, 2018 at 9:12

Bob R

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2 Comments

K.Kovács Over a year ago

I have one more problem, if I get the serial data, my Arduino program jumps back to this loop: while(!Serial.available()){} , and not to the void loop(){}

K.Kovács Over a year ago

But now I recieve the serial data with the Arduino!

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