Arduino TA0136 User Manual page 25

Chapter 4
Hardware installation
The following diagram shows the switch connection with battery pack and L289N.
Caution: Do not modify your programming code when USB cable plugged in Arduino UNO
development board and your computer with wires connecting to L289N Motor Drive board as a large
amount of current will drain from the USB cable which will burn out the computer USB port.
GND
L289N
1b
VMS
1
1
1a
0
Battery Pack
23