Hello community

I want to build a vehicle detection with the camera OAK-1 and a RaspberryPi on which I use the image OAK_CM4_POE.
I have tried this example:
.../dephtai-python/examples/MobileNet/rgb_mobilenet_2.py
I copied the file rgb_mobilenet.py and named it rgb_mobilenet_2.py because I still have the software for PiFace2 installed on the Raspberry and wanted to integrate the PiFace2 into this example.
Now it is about recognizing 3 types of vehicles.
Namely bus, train and car.
The relay of the PiFace2 should switch as soon as one of the 3 objects is detected.
As soon as an object is detected, a frame with the name of the detected object appears in the camera image.
How do I have to write the if-statement, so that I can say for example:
If the frame says "car" or bus or train, then switch the relay.
Here is my code with which I tried this, but nothing worked.
I tried to find the detected object in a variable, but without success....
Therefore also the attempt with: ("train" in detections)...etc


from pathlib import Path
import cv2
import depthai as dai
import numpy as np
import time
import argparse
import pifacedigitalio

nnPathDefault = str((Path(__file__).parent / Path('../models/mobilenet-ssd_openvino_2021.4_6shave.blob')).resolve().absolute())
parser = argparse.ArgumentParser()
parser.add_argument('nnPath', nargs='?', help="Path to mobilenet detection network blob", default=nnPathDefault)
parser.add_argument('-s', '--sync', action="store_true", help="Sync RGB output with NN output", default=False)
args = parser.parse_args()

if not Path(nnPathDefault).exists():
    import sys
    raise FileNotFoundError(f'Required file/s not found, please run "{sys.executable} install_requirements.py"')

# MobilenetSSD label texts
labelMap = ["background", "aeroplane", "bicycle", "bird", "boat", "bottle", "bus", "car", "cat", "chair", "cow",
            "diningtable", "dog", "horse", "motorbike", "person", "pottedplant", "sheep", "sofa", "train", "tvmonitor"]

# Create pipeline
pipeline = dai.Pipeline()

# Define sources and outputs
camRgb = pipeline.create(dai.node.ColorCamera)
nn = pipeline.create(dai.node.MobileNetDetectionNetwork)
xoutRgb = pipeline.create(dai.node.XLinkOut)
nnOut = pipeline.create(dai.node.XLinkOut)

xoutRgb.setStreamName("rgb")
nnOut.setStreamName("nn")

try:
    pfd = pifacedigitalio.PiFaceDigital()
    pfd.leds[0].turn_off()
except:
    print("No Piface connected!")
    pfd = None

# Properties
camRgb.setPreviewSize(300, 300)
camRgb.setInterleaved(False)
camRgb.setFps(30)
# Define a neural network that will make predictions based on the source frames
nn.setConfidenceThreshold(0.5)
nn.setBlobPath(args.nnPath)
nn.setNumInferenceThreads(2)
nn.input.setBlocking(False)

# Linking
if args.sync:
    nn.passthrough.link(xoutRgb.input)
else:
    camRgb.preview.link(xoutRgb.input)

camRgb.preview.link(nn.input)
nn.out.link(nnOut.input)

# Connect to device and start pipeline
with dai.Device(pipeline) as device:

    # Output queues will be used to get the rgb frames and nn data from the outputs defined above
    qRgb = device.getOutputQueue(name="rgb", maxSize=4, blocking=False)
    qDet = device.getOutputQueue(name="nn", maxSize=4, blocking=False)

    frame = None
    detections = []
    startTime = time.monotonic()
    counter = 0
    color2 = (255, 255, 255)
    #Fahrzeug = labelMap[detection.label]

    # nn data (bounding box locations) are in <0..1> range - they need to be normalized with frame width/height
    def frameNorm(frame, bbox):
        normVals = np.full(len(bbox), frame.shape[0])
        normVals[::2] = frame.shape[1]
        return (np.clip(np.array(bbox), 0, 1) * normVals).astype(int)

    def displayFrame(name, frame):
        color = (255, 0, 0)
        for detection in detections:
            bbox = frameNorm(frame, (detection.xmin, detection.ymin, detection.xmax, detection.ymax))
            cv2.putText(frame, labelMap[detection.label], (bbox[0] + 10, bbox[1] + 20), cv2.FONT_HERSHEY_TRIPLEX, 0.5, color)
            cv2.putText(frame, f"{int(detection.confidence * 100)}%", (bbox[0] + 10, bbox[1] + 40), cv2.FONT_HERSHEY_TRIPLEX, 0.5, color)
            cv2.rectangle(frame, (bbox[0], bbox[1]), (bbox[2], bbox[3]), color, 2)
        # Show the frame
        cv2.imshow(name, frame)
        


      

    while True:
        if args.sync:
            # Use blocking get() call to catch frame and inference result synced
            inRgb = qRgb.get()
            inDet = qDet.get()
        else:
            # Instead of get (blocking), we use tryGet (nonblocking) which will return the available data or None otherwise
            inRgb = qRgb.tryGet()
            inDet = qDet.tryGet()

        if inRgb is not None:
            frame = inRgb.getCvFrame()
            cv2.putText(frame, "NN fps: {:.2f}".format(counter / (time.monotonic() - startTime)),
                        (2, frame.shape[0] - 4), cv2.FONT_HERSHEY_TRIPLEX, 0.4, color2)

        if inDet is not None:
            detections = inDet.detections
            counter += 1

        # If the frame is available, draw bounding boxes on it and show the frame
        if frame is not None:
            displayFrame("rgb", frame)
            

              #pull relay to 1 if an Object was detected

	Objects= labelMap[detection.label]
        

        if pfd is not None:
                 pfd.leds[0].turn_on() if (("car" in detection) or ("train" in detection) or ("bus" in detection)) else pfd.leds[0].turn_off()
               # pfd.leds[0].turn_on() if ((Objects == "car") or (Objects == "train") or (Objects == "bus")) else pfd.leds[0].turn_off()


        if cv2.waitKey(1) == ord('q'):
            pfd.leds[0].turn_off()
            break
`