Download Relay Board - 4 Channel Features

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Document: Datasheet
Date: 26-May-12
Model #: 1227
Product’s Page: www.sunrom.com/p-1124.html
Relay Board - 4 Channel
The board has four relays driven by ULN2803 IC. The board works on 12V but the input signal can
come directly from microcontroller output working at 3V or 5V to control relays. Each relay can
switch varierty of AC or DC high voltage, high current loads working at 110V or 220V AC mains like
lights, fans, motors and such. The status of relay is indicated by individual LEDs.
Features
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LED indication of relay on & power
Design based on highly proven IC ULN2803 as driver
Direct input from 3-5V microcontroller for relay control
Output terminal for all relay contacts
Provision for 6 pin Header and Wire connection
Powered from external 12V or from wire header
Board Schematic
1
VDD
LS1
CN1
RELAY - Good Sky RW-SH-112D
PBT3
5
3
4
VDD
RA1
4K7 R-ARRAY
RLY1
1
2
9
8
7
6
5
4
3
2
RLY2
LS3
CN3
RELAY - Good Sky RW-SH-112D
PBT3
5
3
4
VDD
RLY3
LS2
CN2
RELAY - Good Sky RW-SH-112D
PBT3
5
3
4
VDD
1
2
LS4
CN4
RELAY - Good Sky RW-SH-112D
PBT3
5
3
4
VDD
1
2
RLY4
1
2
4x LEDs
D4
D3
D2
D1
U1
ULN2803
VDD
1
2
3
4
5
6
7
8
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
COM
18
17
16
15
14
13
12
11
10
RLY1
RLY2
RLY3
RLY4
VDD
9
6
5
4
3
2
1
OUT1
OUT2
OUT3
OUT4
GND
CN5
SIP6
VDD
R1
4K7
CN6
SIP6
OUT1
OUT2
OUT3
OUT4
CN7
DC SocketVDD
VDD
D5
6
5
4
3
2
1
Sunrom Technologies
Title Four Channel Relay
Code 1227
Date: Saturday, May 12, 2012
http://www.sunrom.com
Sheet 1
Rev
of
Note: It is important that microcontroller share ground with relay board along with other control
signals else it will not able to control relays.
OUT1-4
3-5V MCU
Common GND
12V Power
12V Power
Supply
2
Relay Board
Power GND
Sunrom Technologies
Your Source for Embedded Systems
Visit us at www.sunrom.com
1
1
Output Relays
Relay can control any devices just like a switch contact. Its contact is isolated from driving circuit.
Each relay on board has three contacts namely NC, C
and NO.
NC = Normally Connected
C = Common, either connected to NC or NO.
If relay is off, C is connected to NC
If relay is on C is connected to NO.
NO = Normally Open
For example, When you want to switch on light when relay comes on, then
the light has to be powered through C and NO contacts. In this case NC
will not be used.
AC MAINS 110/250V AC
C
NO
RELAY
Relay Used on Board
Equivalent of
Sealed Isolated Mechanical Relay: GoodSky RWH-SH-106D
Contact Rating
12A at 250VAC.(UL)
15 at 120VDC.
15A at 24VDC.
Rated Carrying Current.........: 15A.
Max. Allowable Voltage .......: .AC 240V, DC 110V.
Min. Switching Load..............: DC5V, 15mA
Relay Datasheet available at
http://www.sunrom.com/files/RWRWH.pdf
3
Sunrom Technologies
Your Source for Embedded Systems
Visit us at www.sunrom.com