Datasheet
revolution
Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.uk Version 2.0 01/09/2002
28-PINPROJ.P65
4
28-PIN PROJECT BOARD
Motor Driver
An optional L293D motor driver IC (not supplied) may be added to the basic interface.
This provides forward-backward control of two DC motors, controlled by outputs 4 to 7.
Naturally, if only one motor is to be controlled then only two output lines are used.
Both inputs low - motor halt
First output high, second output low - motor forward
First output low, second output high - motor reverse
Both inputs high - motor halt
Changing the states of the input pins has the effect of altering the direction of current
flow through the motor, as shown below.
Note that the L293D will become warm with continuous use. A heatsink bonded onto
the top of the chip will help keep it cool.
Motor A and B are connected to the interface via the pads provided. It is necessary to
solder connectors or wires into these pads.
optional L293D
motor driver IC
0V
V2+
0V 0V
M
Pin 4
L293D
5V
In 1
Out 1
0V
0V
Out 2
In 2
V+
5V
In 3
Out 3
0V
0V
Out 4
In 4
5V
1
8
16
9
Pin 5
To V2+
V2+
Motor A
M
Pin 6
Pin 7
Motor B