The Raspberry Pi-enabled Pet/Wildlife Monitor - Raspberry Pi Mechatronics Projects - page 176

3. We will modify the example from Adafrui t that prints the moion sensor events
( https://learn.adafruit.com/pir-passive-infr ared-proximity-
motion-sensor/using-a-pir ).
4. Whenever a moion event is detected, we need to send an alert to the python-
twisted server launched on Raspberry Pi:
if (client.connect(server, 8000)) {
Serial.println("Motion Detected");
client.println("Motion Detected");
client.println();
//Lets wait for the client to read and
//echo the message
//Note: A second's delay is a bit excessive
delay(1000);
client.stop();
Serial.println("Client Disconnected");
} else {
Serial.println("connection failed");
}
5. In order to take pictures of the bird feeder when there is an incoming moion detecion
event, the camera has to be interfaced to the Raspberry Pi as demonstrated in the
video provided by the Raspberry Pi Foundaion ( https://www.youtube.com/
watch?v=GImeVqHQzsE ).
6. In order to trigger a camera to take a snapshot using the python-twis ted server,
we need the picamera modu le ( https://pypi.python.org/pypi/picamera ) .
It can be installed as follows:
sudo apt-get install python-picamera
7. Let's modify the python-twisted example, simpleserv.py , to import the
picamera and datetime modules (to name the pictures captured by the
camera using a imestamp).
8. If the incoming message is Motion Detected , we will take a picture and name
the ile using a imestamp.
9. In the callback method, DataReceived , let's capture an image:
with picamera.PiCamera() as camera:
camera.start_preview()
time.sleep(2)
camera.capture('img{timestamp:%Y-%m-%d-%H-%M}.jpg')