Datasheet

revolution
28-PIN PROJECT BOARD
Contents:
AXE020 28-pin Project Board with input/output cables
Introduction
The 28-pin project board is designed to allow rapid prototyping with
28-pin microcontrollers. The board provides connections for eight
digital inputs, four analogue inputs and eight digital outputs. Each of
the outputs is driven through a darlington driver, which will drive upto
800mA per output. Ribbon cables with connectors are also included, which
enable easy interfacing to the board. Space is provided on the board for adding an
optional motor driver IC, through which DC motors can be controlled with forward/
reverse directional control.
Power
The board can be powered by a single, or two separate, power supplies. When two power
supplies are used the second separate supply (V2+) is used to power the output devices.
This is useful when a higher voltage is required (e.g. when driving a 12V stepper motor) or
when it is necessary to isolate the outputs to avoid noise problems (e.g. when using radio-
control servos).
The primary power supply (V1+) for the interface is a 6V or 4.5V DC. This is connected via
the battery connector. DO NOT use a 9V PP3 battery, as the interface does not include a
voltage regulator.
Revolution Education Ltd. Email: [e-mail] Web: www.rev-ed.co.uk Version 2.0 01/09/2002
28-PINPROJ.P65
these two pins
connected
0V
V2+
When two power supplies
are required the second
supply is connected to
jumper E as shown right.
When a single power
supply is used a jumper
link is required on the
external power jumper
link ‘E’ as shown right.
NOTE: The three-pin header and stereo
socket at the top of the board are
redundant for project board
applications. This header is only used
in conjunction with the PICAXE-28
programming system. More information
about the PICAXE system can be found
at: www.rev-ed.co.uk