Question

当ESP用超声波传感器检测到物体时，我希望ESP32向Raspberry发出信号。收到信号后，Raspberry会拍照。

我的问题是我尝试使用LED“信号”中的信号代码，但无法正常工作。它始终显示，当Raspberry和ESP在镜像中连接此问题时：

mmal: mmal_vc_port_enable: failed to enable port vc.null_sink:in:0(OPQV): ENOSPC
mmal: mmal_port_enable: failed to enable connected port (vc.null_sink:in:0(OPQV))0x1d08dc0 (ENOSPC)
mmal: mmal_connection_enable: output port couldn't be enabled
Traceback (most recent call last):
  File "camera.py", line 18, in <module>
    cam = PiCamera()
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 433, in __init__
    self._init_preview()
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 513, in _init_preview
    self, self._camera.outputs[self.CAMERA_PREVIEW_PORT])
  File "/usr/lib/python2.7/dist-packages/picamera/renderers.py", line 558, in __init__
    self.renderer.inputs[0].connect(source).enable()
  File "/usr/lib/python2.7/dist-packages/picamera/mmalobj.py", line 2212, in enable
    prefix="Failed to enable connection")
  File "/usr/lib/python2.7/dist-packages/picamera/exc.py", line 184, in mmal_check
    raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Failed to enable connection: Out of resources


------------------
(program exited with code: 1)
Press return to continue

我已经尝试使用app.run(host = '0.0.0.0')修复ID，但是它向我展示了相同的问题。

这是我的Python代码：

import time
import os                                                                                       # import the time
from picamera import PiCamera                                                                   # import image from the camera into the Raspberry
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)                                                                          # define pins

GPIO.setup(11, GPIO.IN)                                                                         # setup pin 11 as input


if __name__=='__main__':
    while True:
        if(GPIO.input(11) == GPIO.HIGH):



            #Variables
            cam = PiCamera()
                                                                                                # make the variable cam 

            #Define how newimagen is made of (Variable)                                         # make the variable fname which give us the date and Time 
            os.chdir('/home/pi/Desktop/image/')                                                 # Define where we are working now 
            images = [i for i in os.listdir(os.getcwd()) if i.lower().startswith('image')]      # define what images is : 
                                                                                                # os.listdir returns a list containing of the entries in the directory os.getcwd...
                                                                                                # os.getcwd returns the current working directory of a process --> '/home/pi/Desktop/'

            if images:
                newest = max(images, key=os.path.getmtime)                                      # max() is a method that returns the largest item of sth
                                                                                                # os.path.getmtime return the time of last modification
            else:
                newest = 'image0.jpg'


            number = int(''.join([i for i in newest if i.isdigit()]))                           #number is the number of the newest image : image1 --> number = 1. This method look up if there is an image and which number it has
            newimagen = 'image'+str(number+1)+'.jpg'                                            # newimagen is the variable that decide which image it will be(image1 or image2...)

            #Camera Code changing 
            cam.resolution = (2592,1944)                                                        # method to change the resoltuion

            #Main Code      
            cam.capture('/home/pi/Desktop/image/'+newimagen)

这是我的Arduino代码：

// defines pins numbers

#define trigPin 12
#define echoPin 13
#define ledPin  14

// defines variables
long duration;
int distance;

boolean triggered = false;

double activateDistance = 10;

void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  pinMode(ledPin, OUTPUT);

  Serial.begin(9600); // Starts the serial communication

}

void loop() 
{
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);



  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculating the distance
  distance = duration * 0.034 / 2;

  // Prints the distance on the Serial Monitor
  if (distance <= activateDistance)
  {
    digitalWrite(ledPin, HIGH);
    Serial.print("GOT");
    delay(1000);
    digitalWrite(ledPin,LOW);
  }else{
    digitalWrite(ledPin,LOW);
  }

}

目前，它仅使LED点亮，我认为（朋友也是如此），可以使用相同的代码将信号发送到Raspberry。

如果这个社区的人们可以帮助我，那将是非常棒的。如有任何问题，请随时纠正我。

Answer 1

尽量减少问题原因。

从我看到的错误来看，问题在于/search模块无法正常工作，因此我认为最好测试您的pi并查看它是否与{{ 3}}：

PiCamera

如果它不起作用，那么您只能专注于真正的问题。

此外，我怀疑while循环中是否存在import time import picamera with picamera.PiCamera() as camera: camera.start_preview() time.sleep(10) camera.stop_preview()，请在循环之前将其移动并再次检查：

cam = PiCamera()

如何使用电缆将信号从ESP32发送到Raspberry pi

1 个答案: