MR-BusIO-ACINTM BusIO AC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
GRAVITECH.US
uResearch
GRAVITECH GROUP
MR-BusIO-ACINTM BusIO AC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
The MR-BusIO-ACIN is an 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.
The board can be use with MR-BusIO-
MAIN board or stand-alone. PCB size is
0.63” x 2.80”
The PC817 require at least 5mA to drive
input photo-coupler LED. It can take up to
6V in reverse bias. For an output
(between collector and emitter), it can
drive up to 35V with 50mA continuous
current.
The operation of this board starts when
it’s receiving input 110-220VAC via 2-PIN
terminal. The current is flowing through
0.1uF 250V capacitor and 100Kohm 1W
resistor. The circuit acts as a Capacitive
Reactance which reduce the input AC
voltage. The benefit of this circuit is to
reducing the heat of the resistor. The
current then flow into bridge rectifier circuit
and activate PC817 circuit. The I/O pin
then becomes a logic LOW and an
indicator LED is illuminated
User can use this board to detect AC
voltage.
The MR-BusIO-MAIN is 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-MAIN
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.
Description
MR-BusIO-MAIN
Operation:
MR-BusIO-ACINTM BusIO AC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
FIG 1: MR-BusIO-ACIN Board Layout
FIG 2: MR-BusIO-ACIN Schematic
MR-BusIO-ACINTM BusIO AC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
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