Started following some tutorial on att85 usi. Downloaded example code from make avr book.

Make AVR Examples/Chapter08_Hardware-Interrupts/capSense/serialScope.py

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+import serial
+
+def readValue(serialPort):
+    return(ord(serialPort.read(1)))
+
+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):
+    while(1):
+        newValue = readValue(serialPort)
+        plotValue(newValue)
+        
+
+if __name__ == "__main__":
+    ## 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
+
+    ## Take command-line arguments to override defaults above
+    import sys
+    if len(sys.argv) == 3:
+        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=TIMEOUT)
+    serialPort.flush()
+    cheapoScope(serialPort)