#!/bin/bash --posix
# $VER: Arduino.sh_Version_0.00.10_(C)2013_B.Walker_G0LCU.

Arduino_Device="Unknown!"
DATA="0"

> /tmp/usbdata.raw

echo "Remove the Arduino board from the USB port ,IF, it is connected."
read -p "Press <CR> to continue:- " -e Arduino_Device
echo "The error report IS expected!"
ls /dev/cu.usb*
echo "Now connect the Arduino board to the USB port."
sleep 5
read -p "Press <CR> to continue:- " -e Arduino_Device

Arduino_Device="`ls /dev/cu.usb*`"
clear
while true
do
	if [ ${#DATA} -le 0 ]
	then
		echo "ERROR! Unsuccessful data aquisition..."
		break
	fi
	DATA=$[ ( $DATA * 20 ) ]
	printf "\\x1B[11;33f0.000 Volts DC.\n\n"
	if [ ${#DATA} -eq 2 ]
	then
		printf "\\x1B[11;36f$DATA\n\n"
	fi
	if [ ${#DATA} -eq 3 ]
	then
		printf "\\x1B[11;35f$DATA\n\n"
	fi
	if [ ${#DATA} -eq 4 ]
	then
		DATA="${DATA:0:1}.${DATA:1:2}"
		printf "\\x1B[11;33f$DATA\n\n"
	fi
	dd if="$Arduino_Device" of=/tmp/usbdata.raw bs=1 count=1
	DATA=`hexdump -n1 -s0 -v -e '1/1 "%u"' /tmp/usbdata.raw`
done

Last login: Fri Aug 30 21:34:09 on ttys000
AMIGA:barrywalker~> ./Arduino.sh
Remove the Arduino board from the USB port ,IF, it is connected.
Press <CR> to continue:- 
The error report IS expected!
ls: /dev/cu.usb*: No such file or directory
Now connect the Arduino board to the USB port.
Press <CR> to continue:- 

                                0.000 Volts DC.

1+0 records in
1+0 records out
1 bytes transferred in 0.007705 secs (130 bytes/sec)c)

# AND...

                                2.580 Volts DC.

1+0 records in
1+0 records out
1 bytes transferred in 0.007620 secs (131 bytes/sec)))

# AND...

                                5.100 Volts DC.

1+0 records in
1+0 records out
1 bytes transferred in 0.007678 secs (130 bytes/sec)))