MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
GRAVITECH.US
uResearch
GRAVITECH GROUP
MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
The MR-BusIO-MAIN is an experiment
board which receives output signals from
any microcontrollers. The signals then
distribute to daughter boards for each
experiment. It designed to connect directly
with 10PIN MRconnect©. It is a quick and
easy way to control up to 8 daughter
boards.
The MR-BusIO-MAIN can receive 3 types
of input: from 8-bit port of any
microcontrollers to the board directly
(10PIN MRconnect©), from I2C bus
through PCF8574 Expansion Port IC
(optional), or from 34-pin header that have
jumpers to select which pins to use to
control the daughter boards. The block
diagram in Figure 1 show the structure of
the I/O pins for MR-BusIO-MAIN board.
FIG1: System block diagram
There are three ways to connect to the
board. User must choose only one way to
connect. The signals then route to IO0-
IO7 for all 8 daughter boards. PCB size is
6.0” x 3.5”.
When using I2C interface, user must
connect PCF8574 IC on to the board. The
jumpers to configure I2C address must be
set to appropriate setting base on the user
code. In the event of user want to switch
to use different input type, i.e. 10PIN
MRconnect©, user MUST remove
PCF8574 IC before attempt to connect.
When using 34-PIN header, user must
assign jumpers to select which port pins to
use. There are three ports available to use
A, B, or C. User can only select from one
port.
When using 10PIN MRconnect©, user can
connect directly to 10-PIN header without
configure any things.
The card can be power by using the
power from the 10PIN MRconnect©, 2-PIN
header, pin 25 from 34-PIN header, or
external 2.5mm, center negative, 9-
16VDC wall adapter or pin 10 on I2C input
header. When using external power
supply, make sure it is +5VDC.
Description Interfaces
I2C:
10-PIN
MRconnect©
I2C (Optional)
34-PIN Header
34-PIN Header:
10PIN MRconnect©:
Power:
MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
FIG 3: MR-BusIO-MAIN Board Layout
FIG 4: MR-BusIO-MAIN Schematic
MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
P0 P1
P2 P3
P4 P5
P6 P7
VCC GND
FIG 2: 10 PIN MRconnect©
All of the accessories are available for
purchase via our website. If you don’t see
the item you need, please contract our
sales department at sales@gravitech.us
• MR-BusIO-ACIN
Experiment board for receiving 110-
220VAC input and translates into TTL
5VDC level. It is using PC817 Photo-
coupler IC to isolate high current and low
current. It is best for monitoring the
present of AC voltage.
• MR-BusIO-BUZZER
Experiment board for buzzer output. The
input signal is isolated from buzzer driver
circuitry by PC817 Photo-coupler IC.
• MR-BusIO-DCIN
Experiment board for receiving 5V, 12V or
24VDC input and translates into TTL
5VDC level. It is using PC817 Photo-
coupler IC to isolate high current and low
current. It is best for monitoring the
present of DC voltage.
Daughter Boards
10PIN MRconnect
©
Pinout:
MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
• MR-BusIO-DCOUT
Experiment board for switching DC output
voltage by using NPN Power Transistor
2SC1061. The advantage of this transistor
is VCE(sat) = 1V (max.) at IC = 2A and IB =
0.2A. The output DC voltage is switching
ON and OFF by TTL level 5VDC. It is
using PC817 Photo-coupler IC to isolate
high current and low current. It is best for
controlling DC voltage for up to 50V at 3A.
• MR-BusIO-PHOTORELAY
Experiment board for switching output by
using AQV210E IC, PhotoMOS Relays.
PhotoMOS Relays combined advantage of
solid state relays and mechanical relays
together, so efficient is perfect and better
than other devices. The maximum peak
value at the load is 350V, 130mA for both
AC and DC.
• MR-BusIO-RELAY
Experiment board for switching AC or DC
output by using mechanical relay. The
maximum controlling voltage is 250VAC at
5A or 24VDC at 10A. It is using PC817
Photo-coupler IC to isolate high current
and low current. It is best for switching
output load.
• MR-BusIO-SSRAC
Experiment board for switching AC output
voltage by using SSR (Solid State Relay).
SSR is similar to mechanical relay that
consists of inductor and surface contact.
The internal structure of SSR uses
semiconductor material to switching ON
and OFF. The maximum controlling
voltage is 400VAC at 6A. It is best for
switching AC output voltage.
MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
• MR-BusIO-SW
Experiment board for receiving input from
push button switch. When the switch has
been pressed, the indicator LED is
illuminated and status on I/O pin is LOW.
Moreover, user can add DS18S20 IC, 1-
Wire Digital Thermometer onto the board.
It can send the temperature value via 1-
Wire bus system to microcontroller
(optional). It is best for sensing switch
input and temperature reading.
MR-BusIO-MAINTM BusIO MAIN BOARD (10-PIN MRconnect© ready)
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
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