Arduino Serial Communication. TX lags RX.

Projects Programming
1

I am using OpenCV and Python for Video Processing. The code detects a binary thresholded object in the camera frame. If the particular colored object is in front of the cam, python sends char '"1" using pyserial. As a while loop is used to go through each frame of the video, RX is active most of the time on arduino. Now if i receive char "1", i want to set Servo to 90 degrees else every time I want to set Servo to 0 degrees.

Python Code -

import opencv
import serial

ser = serial.Serial("/dev/ttyACM0", 115200)
cap = cv2.VideoCapture(0)

while(cap.issOpened()):
       ret, img = cap.read()
       #Thresolding Code
      if(object_detected):
            serial.write("1")

Arduino Code -

#include <Servo.h>

int incomingByte = 0;
 
Servo myservo;

void setup() {
  
  Serial.begin(115200);
  myservo.attach(9);
  
}

void loop() {
  if (Serial.available() > 0) {
      
      incomingByte = Serial.read();
      if(incomingByte == 49){
      myservo.write(90);
      }
      else{
      myservo.write(0);
      }
      }
      }

The RX receives the byte on time but the loop stucks while transmitting. How can I optimize my code to solve the issue? i tried Serial.flush() function which waits for transmission to complete but it was of no help.

Thanks in advance.

2

Hintif(incomingByte == '1'){

3

I think its the same as character "1" 's ASCII value is 49 and it would convert to 49 only.

4

It is the same, but isn't it easier to use '1', than 49?

5

I don't see any code that tries to write...

6

This Python - Arduino demo may help. See also Serial Input Basics

...R

7

It sounds to me like an output buffer is filling up. When the output buffer fills up your Python program will have to wait for a character to be sent before it can add another character to the output buffer.