kivy_arduino.py

import serial
import kivy

from kivy.app import App
from kivy.clock import Clock
from kivy.core.window import Window
from kivy.uix.scrollview import ScrollView
from kivy.uix.gridlayout import GridLayout
from kivy.properties import ObjectProperty, StringProperty

from kivy.uix.button import Button


class ProductList(GridLayout):
    pass

class ButtonListItem(Button):
    wid = StringProperty('')
    image = StringProperty('')
    title = StringProperty('')
    label = StringProperty('')
    pass


class KmartSco(App):

    def build(self):
        #Window.fullscreen = True
        self.arduino = serial.Serial('COM5', 115200)
        self.event = Clock.schedule_interval(self.readArduino, 1 / 30.)
        # Window.size = 400, (4 * 90)
        self.layout = ProductList(cols=1)
        self.layout.size = Window.size
        self.root = ScrollView(
                        # size_hint=(None, None),
                        # size=Window.size,
                        scroll_type=['bars', 'content']
                    )
        self.root.add_widget(self.layout)
        print "Finished building.."

    def readArduino(self,lixo):
        if (self.arduino.inWaiting()>0):
            myData = self.arduino.readline()
            print myData
            if myData.starts    with('EPC'):
                ib = ButtonListItem(
                            wid="0",
                            image="apple.jpg",
                            title=myData,
                            label=myData
                )
                self.layout.add_widget(ib)

if __name__ == '__main__':
    KmartSco().run()

kmartsco.kv

#:kivy 1.8.0

<ButtonListItem@Button>:
    wid: self.wid
    image: self.image
    title: self.title
    label: self.label
    on_press: self.click()
    BoxLayout:
        orientation: "horizontal"
        size: self.parent.size      # match the button's size
        pos: self.parent.pos        # match the button's position
        padding: 5
        spacing: 10

        Image:
            size_hint: None, 1
            source: root.image
            size: 64, 64
            valign: "middle"


        Label:
            size_hint: None, 1
            text: root.label
            valign: "middle"
            size: 400, 64
            text_size: self.size


<ProductList@GridLayout>
    id: output
    cols: 1
    size_hint_y: None
    height: self.minimum_height

    Button:
        id: label1
        text: 'Welcome to Kmart!'