Software

For this project I and Salvatore have write some bit of code in Python for use Sentiment140 API and make a simple GET request to the server. When the code receive the response "200" from Sentiment140 the software parse the JSON data for give us the "polarity" relative to the keyword. At this point a part of SW convert the polarity in the right steps for the movement.

Code:

# coding=utf-8

import sys
import RPi.GPIO as gpio
import time
import requests
import json

# Opzioni controllo motore
stepUp = 2000 # Posizione in step per espressione triste
stepDwn = -2000 # Posizione in step per espressione sorridente
setpNeuter = 0 # Posizione in step per espressione neutra
WaitTime = 0.001


# API Sentiment140
url = "http://www.sentiment140.com/api/bulkClassifyJson"

# ====================== Funzioni di controllo motore ======================= #

gpio.setmode(gpio.BCM)
gpio.setwarnings(False)

gpio.setup(19, gpio.OUT)
gpio.setup(26, gpio.OUT)


def move(targhetStep):

	# StepCounter mi serve globale in maniera che gli aggiornamenti siano 
	# visibili esternamente.
	global StepCounter

	# Muovo il cursore verso l'alto
	if StepCounter < targhetStep:
		gpio.output(19, True)

		while StepCounter < targhetStep:
			#turning the gpio on and off tells the easy driver to take one step
			gpio.output(26, True)
			gpio.output(26, False)

			StepCounter += 1

			#Wait before taking the next step...this controls rotation speed
			time.sleep(WaitTime)

	# Muovo il cursore verso il basso
	elif StepCounter > targhetStep:
		gpio.output(19, False)

		while StepCounter > targhetStep:
			#turning the gpio on and off tells the easy driver to take one step
			gpio.output(26, True)
			gpio.output(26, False)

			StepCounter -= 1

			#Wait before taking the next step...this controls rotation speed
			time.sleep(WaitTime)

#	gpio.cleanup()	


# ====================== Funzioni richiesta/Impiego sentiment ================ #

def negative():
	print "Negative"
	move(stepUp)

def positive():
	print "Positive"
	move(stepDwn)

def neutral():
	print "Neutral"
	move(setpNeuter)

polarityOpt = {	0 : negative,
				2 : neutral,
				4 : positive,
}

# ====================== Ciclo principale ======================= #
if __name__ == '__main__':

	StepCounter = 0
	print "Posizine del cursore: ", StepCounter

	while True:
		keyword = raw_input("Inserisci la keyword:")

		data = "{'data': [{'text': '"+keyword+"'}]}"

		r = requests.post(url, data)

		print(r.status_code)

		reqResult = r.json()

		polarity = reqResult["data"][0]["polarity"]

		polarityOpt[polarity]()

		print "Posizine del cursore: ", StepCounter

Remember to calibrate the mouth in Neutral position with "calibra.py", before you launch the main SW.

After download the software and calibrate the mouth in the middle, you can launch "smileMecca.py".

$ cd smileMecca/SW/
$ sudo python smileMecca.py

Posizine del cursore:  0
Inserisci la keyword:i love fablabnapoli
200
Positive
Posizine del cursore:  -2000
Inserisci la keyword:i hate fablab napoli
200
Negative
Posizine del cursore:  2000
Inserisci la keyword:fablab
200
Neutral
Posizine del cursore:  0
Inserisci la keyword:

Enjoy with Harvey!!

And this is the screenshot of the terminal that you saw on the video, while I was doing some test with Harvey.