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PROJECTS RoboticsRaspberry Pi

CAT Robot Based on DS18B20 Temperature Sensor

DFRobot Sep 18 2017 650

I used to dream of my kitty talking to me and now I am going to make my toy kitty react to my actions and even CHAT WITH ME!


Step 1: Schematic

Let's make a draft about the project.

Firstly I need a raspberry pi, which has a Linux OS, can compile Python and even has an access to the Internet.
Secondary I would like to use Arduino to get some data as well as realize some basic physical reactions.
Thirdly a webcam is required to capture user actions.
Finally is to make the connection to an AI chatbot.

Material List:
Raspberry Pi 3 Model B
5MP Night Vision Camera for Raspberry Pi
DFRduino UNO R3 [ similar as Arduino UNO R3 ]
USB Cable A-B for Arduino Uno/Mega
Waterproof DS18B20 Sensor Kit
9g micro servo (1.6kg)
and a monitor is required for raspberry pi


Step 2: Assambling

Just have everything in their right position.


Step 3: Initial Raspberry Pi

Step 4: Test the Pi-camera

here is a test code from pythonprogramming.net
import io
import picamera import cv2 import numpy
#Create a memory stream so photos doesn't need to be saved in a file stream = io.BytesIO()
#Get the picture (low resolution, so it should be quite fast) #Here you can also specify other parameters (e.g.:rotate the image) with picamera.PiCamera() as camera: camera.resolution = (320, 240) camera.capture(stream, format='jpeg')
#Convert the picture into a numpy array buff = numpy.fromstring(stream.getvalue(), dtype=numpy.uint8)
#Now creates an OpenCV image image = cv2.imdecode(buff, 1)
#Load a cascade file for detecting faces face_cascade = cv2.CascadeClassifier('/usr/share/opencv/haarcascades/haarcascade_frontalface_alt.xml')
#Convert to grayscale gray = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)
#Look for faces in the image using the loaded cascade file faces = face_cascade.detectMultiScale(gray, 1.1, 5)
print "Found "+str(len(faces))+" face(s)"
#Draw a rectangle around every found face for (x,y,w,h) in faces: cv2.rectangle(image,(x,y),(x+w,y+h),(255,255,0),2)#Save the result image cv2.imwrite('result.jpg',image)


Step 5: PySerial Encapsulates the Access for the Serial Port

connect the Raspberry Pi and the Arduino Uno with the cable.
After installing pySerial, reading data from Arduino is straightforward:
>>> import serial
>>> ser = serial.Serial('/dev/tty.usbserial', 9600)
>>> while True:
... print ser.readline()
'1 Hello world!\r\n'
'2 Hello world!\r\n'
'3 Hello world!\r\n'
Writing data to Arduino is easy too (the following applies to Python 2.x):
>>> import serial # if you have not already done so
>>> ser = serial.Serial('/dev/tty.usbserial', 9600)
>>> ser.write('5')
Hint: http://playground.arduino.cc/Interfacing/Python


Step 6: Test the Sensor and the Servo on the Arduino

Step 7: Add Chatbot Functions
Step 8: Update Your Code
Step 9: Package Everything and Put Them Into a Toy Kitty