CODEWITHSUNDEEP
pythonopencvarduinoserial-port
sayem48
sayem48

Reputation: 101

Python sending signal to Arduino only once

I want to move a servo connected to arduino when I detect face in OpenCV (python).

OpenCV code:

import numpy as np
import cv2
import serial
import time

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

cap = cv2.VideoCapture(0)

ser = serial.Serial('COM1', 19200,timeout=5)
time.sleep(6)
print(ser)


while 1:
    ret, img = cap.read()

    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

    faces = face_cascade.detectMultiScale(gray, 1.3, 5)

    for (x1, y1, w1, h1) in faces:
        cv2.rectangle(img, (x1, y1), (x1 + w1, y1 + h1), (255, 0, 0), 2)

        detect_face=x1
        print 'face distance: ', detect_face

        cv2.imshow('img', img)
        k = cv2.waitKey(30) & 0xff

        if 0 < detect_face < 100:
            ser.write('Y')

    if k == 27:
                break

cap.release()
cv2.destroyAllWindows()

Arduino Code:

#include <Servo.h> 

int servoPin = 3; 

Servo Servo1;


char incomingBit;   

void setup() {

  Servo1.attach(servoPin);
  pinMode(servoPin, OUTPUT);     
  Serial.begin(19200);    
}
void loop() {
  if (Serial.available() > 0) {      


        incomingBit = Serial.read();
        Serial.print("I received:  ");


        Serial.println(incomingBit); 
        if(incomingBit == 'Y' || incomingBit == 'y') {



  Servo1.write(0); 
  delay(1000); 

   Servo1.write(90); 
 delay(1000); 
 Servo1.write(180); 
 delay(1000); 
 exit(0);
            }
            else {
              digitalWrite(servoPin, LOW); 
            }
  }

}

I get the following face_detect value :

Serial<id=0x3203c30, open=True>(port='COM1', baudrate=19200, bytesize=8, 
 parity='N', stopbits=1, timeout=5, xonxoff=False, rtscts=False, 
 dsrdtr=False)
face distance:  203
face distance:  192
face distance:  187
face distance:  177
face distance:  163
face distance:  157
face distance:  145
face distance:  130
face distance:  116
face distance:  109
face distance:  104
face distance:  95
face distance:  80
face distance:  80
face distance:  98
face distance:  100
face distance:  98
face distance:  101
face distance:  110
face distance:  108
face distance:  109
face distance:  110   
face distance:  110
face distance:  96
face distance:  88
face distance:  81

The first time face_detect goes below 100, python sends a signal and servo does a 180 degree turn. But after that it just remains there. Although face_detect goes below 100 several times, servo does not move.

I think i am having a loop problem. How to solve that?

Upvotes: 1

Views: 256

Answers (1)

Piglet
Piglet

Reputation: 28958

exit(0) stops your program in the first loop cycle when you have a data in the serial buffer. It basically puts your arduino into an infinite loop that does nothing.

Have you even read your code befor posting that question?

Upvotes: 1

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