def append_values(self, x):        
        self.Line1.append(float(x))
        self.Line1 = self.Line1[-1 * self.npoints:]
        return
    def replot(self):   
    
        aufloesung = 1600  # Höhe Y-Achse - ((Auflösung-ADC /2)*Faktor) = 0
        h = self.winfo_height()
        max_X = max(self.Line1) + 1e-5                 
        coordsX  =[]
        for n in range(0, self.npoints):
            x = (800 * n) / self.npoints # 800 ist die breite            
            coordsX.append(x)
            coordsX.append(200-(self.Line1[n]*aufloesung))    # 250 pixel (y-achse) - (messwert in v) * auflösunsfaktor        
        self.canvas.coords('X', *coordsX)        

    def read(self):
        self.after(1, self.ReadADC)         
        self.after_idle(self.replot)                      
        self.after(20, self.read) # zeitabstand zwischen ad wandlung 20
    def ReadADC(self):
        x = getAnalogData(1,CLK,DIN,DOUT,CS)               
        self.append_values(x)

root = tk.Tk()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()   
root.overrideredirect(1)
root.geometry("%dx%d+0+0" % (w, h-20))
app = App(root)
app.mainloop()