diff --git a/Chapter05_Serial-IO/serialOrgan/autoPlay.py b/Chapter05_Serial-IO/serialOrgan/autoPlay.py
index f1a4cb27..8b0caddc 100644
--- a/Chapter05_Serial-IO/serialOrgan/autoPlay.py
+++ b/Chapter05_Serial-IO/serialOrgan/autoPlay.py
@@ -8,16 +8,18 @@
 
 def playString(noteString, serialPort):
   for letter in noteString:
-    print letter
-    serialPort.write(letter)
+    print(letter)
+    serialPort.write(letter.encode())
     returnValue = serialPort.read(1)
     
 if __name__ == "__main__":
 
-  import time, urllib2
+  import time
+  from urllib.request import urlopen
 
   ## Need to consider alternatives for Mac / Windows
-  PORT = "/dev/ttyUSB0"
+  ## list all serial ports being used: python -m serial.tools.list_ports
+  PORT = "/dev/ttyUSB0" # Change this to the current serial port being used
   BAUD = 9600
 
   s = serial.Serial(PORT, BAUD)
@@ -27,29 +29,22 @@ def playString(noteString, serialPort):
 
   ## An intentional example.  You can use this for playing music on purpose.
   playString("f g h j k l ; ]'[", s)
-  raw_input("Press enter for next demo\n")
+  input("Press enter for next demo\n")
 
   ## A fun / stupid example.  You can just type stuff and see what comes out.
   playString("hello there, this is a random string turned into 'music'", s)
-  raw_input("Press enter for next demo\n")
+  input("Press enter for next demo\n")
 
+  ## Website no longer alive... skipping:
   ## A really frivolous example.  Play websites!
   ## Bonus points for first person to tweet themselves a song.
-  print ("Downloading song data from http://serialorgansongs.jottit.com/...")
-  import re
-  contentFilter = re.compile(r'<p>(.*?)</p>')
-  songSite = urllib2.urlopen("http://serialorgansongs.jottit.com/").read()
-  songText = contentFilter.findall(songSite)[0]
-  playString(songText, s)
+  #print ("Downloading song data from http://serialorgansongs.jottit.com/...")
+  #import re
+  #contentFilter = re.compile(r'<p>(.*?)</p>')
+  #songSite = urlopen("http://serialorgansongs.jottit.com/").read()
+  #songText = contentFilter.findall(songSite)[0]
+  #playString(songText, s)
  
   ## Or interactive
-  mySong = raw_input("\nType in your own song: ")
+  mySong = input("\nType in your own song: ")
   playString(mySong, s)
-  
-  
-
- 
-
-  
-  
-  
diff --git a/Chapter06_Digital-Input/bossButton/bossButton.py b/Chapter06_Digital-Input/bossButton/bossButton.py
index e9892d87..c33409a4 100644
--- a/Chapter06_Digital-Input/bossButton/bossButton.py
+++ b/Chapter06_Digital-Input/bossButton/bossButton.py
@@ -21,11 +21,11 @@
 while(1):                       # Sit and wait forever
     response = sp.read(1)       # get one byte
     if response == "O":
-        print "Got OK Byte.  Waiting for button press."
-    elif response == "X":
-        print "Got Boss Byte!  Alarm!"
+        print ("Got OK Byte.  Waiting for button press.")
+    elif response == b"X":
+        print ("Got Boss Byte!  Alarm!")
         webbrowser.open(BOSS_SITE)
     else:
-        print "Got nothing.  Still waiting."
+        print ("Got nothing.  Still waiting.")
 
 
diff --git a/Chapter07_Analog-to-Digital-Conversion-I/slowScope/serialScope.py b/Chapter07_Analog-to-Digital-Conversion-I/slowScope/serialScope.py
index fd98580e..3f8828b2 100755
--- a/Chapter07_Analog-to-Digital-Conversion-I/slowScope/serialScope.py
+++ b/Chapter07_Analog-to-Digital-Conversion-I/slowScope/serialScope.py
@@ -5,18 +5,18 @@ def readValue(serialPort):
 
 def plotValue(value):
     """ Displays the value on a scaled scrolling bargraph"""
-    leadingSpaces = " " * (value*(SCREEN_WIDTH-3) / 255)
-    print "%s%3i" % (leadingSpaces, value)
+    leadingSpaces = "-" * int(value*(SCREEN_WIDTH-3) / 255)
+    print(f"{leadingSpaces} {value:03}")
 
 def cheapoScope(serialPort):
     while(1):
-	newValue = readValue(serialPort)
-	plotValue(newValue)
+        newValue = readValue(serialPort)
+        plotValue(newValue)
         
 
 if __name__ == "__main__":
-    
-    PORT = '/dev/ttyUSB0'
+    ## list all serial ports being used: python -m serial.tools.list_ports
+    PORT = '/dev/ttyUSB0' # update to whatever port is listed in serial.tools.list_ports
     BAUDRATE =  9600
     TIMEOUT = None
     SCREEN_WIDTH = 80
@@ -27,18 +27,9 @@ def cheapoScope(serialPort):
         port = sys.argv[1]
         baudrate = int(sys.argv[2])
     else:                        # nothing passed, use defaults 
-	print ("Optional arguments port, baudrate set to defaults.")
-	port, baudrate = (PORT, BAUDRATE)
+        print ("Optional arguments port, baudrate set to defaults.")
+        port, baudrate = (PORT, BAUDRATE)
         
     serialPort = serial.Serial(port, baudrate, timeout=TIMEOUT)
     serialPort.flush()
     cheapoScope(serialPort)
-
-
-
-    
-
-
-
-  
-
diff --git a/Chapter08_Hardware-Interrupts/capSense/serialScope.py b/Chapter08_Hardware-Interrupts/capSense/serialScope.py
index 64dd38cf..3f8828b2 100755
--- a/Chapter08_Hardware-Interrupts/capSense/serialScope.py
+++ b/Chapter08_Hardware-Interrupts/capSense/serialScope.py
@@ -1,49 +1,35 @@
-#!/usr/bin/env python
-
 import serial
 
 def readValue(serialPort):
     return(ord(serialPort.read(1)))
 
-def plotValue(value, dashes):
-    """
- 	Displays the value on a scaled scrolling bargraph
-    """
-    value = int(value)
-    if dashes:
-        print "%s%3i" % (("-"*(value*77 / 255)), value)
-    else:
-        print "%s%3i" % ((" "*(value*77 / 255)), value)
+def plotValue(value):
+    """ Displays the value on a scaled scrolling bargraph"""
+    leadingSpaces = "-" * int(value*(SCREEN_WIDTH-3) / 255)
+    print(f"{leadingSpaces} {value:03}")
 
-def cheapoScope(serialPort, smoothing, dashes=True):
-    runningValue = 0.0
+def cheapoScope(serialPort):
     while(1):
-        runningValue = float(readValue(serialPort)) + smoothing*runningValue
-	plotValue(runningValue*(1.0 - smoothing), dashes)
+        newValue = readValue(serialPort)
+        plotValue(newValue)
         
 
 if __name__ == "__main__":
-    
-    PORT = '/dev/ttyUSB0'
+    ## list all serial ports being used: python -m serial.tools.list_ports
+    PORT = '/dev/ttyUSB0' # update to whatever port is listed in serial.tools.list_ports
     BAUDRATE =  9600
-    SMOOTHING = 0
+    TIMEOUT = None
+    SCREEN_WIDTH = 80
 
     ## Take command-line arguments to override defaults above
     import sys
     if len(sys.argv) == 3:
-        baudrate, smoothing = [float(x) for x in sys.argv[1:3]]
-    else:
-        baudrate, smoothing = (BAUDRATE, SMOOTHING)
+        port = sys.argv[1]
+        baudrate = int(sys.argv[2])
+    else:                        # nothing passed, use defaults 
+        print ("Optional arguments port, baudrate set to defaults.")
+        port, baudrate = (PORT, BAUDRATE)
         
-    serialPort = serial.Serial(PORT, baudrate, timeout=10)
+    serialPort = serial.Serial(port, baudrate, timeout=TIMEOUT)
     serialPort.flush()
-    cheapoScope(serialPort, smoothing, dashes=False)
-
-
-
-    
-
-
-
-  
-
+    cheapoScope(serialPort)