5/24/2018 RaspberryPi SainsmartRelay Wiring 02

1/1

JD-VCC

VCC

GND

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

VCC

GND

+5V

GND

USB

HDMI

ETHERNETMICRO

USB

SDCARD

+3.3V

TP1

TP2

12345678

AUDIOVIDEO

Raspberry Pi

Model B

Rev 2.0

Sainsmart 8ch 5-V Relay Board

A B C A B C A B C A B C A B C A B C A B C A B C

RELAYBOARDINPUT

FROMGPIO

PIN

2.2k

10k

2N222NPN

TRANSISITOR

The relay board is active low which means the relays are

switched on when the inputs have a low voltage (0V) applied

to them. Since the GPIO pins output 3.3V when active, this

circuit will effectively short the relay board input to ground

making it 0V and will activate the relay.

During normal operation, when a relay is active, it s terminals

A and B are connected. When de-activated, B and C areconnected. A and C are never c onnected.

Please note, there are differences betweenRev 1.0 boards and Rev 2.0 boards GPIO Pins! (Rev 2.0 shown)

Also, there are two widely used number schemesthat depend on which class library (BCM or Wiring Pi)that you intend to use to control the pin outputs.

DNC= Do Not Connect

GPIO7

GPIO8

GPIO25

DNC

GPIO24

GPIO23

DNC

GPIO18

GPIO15

GPIO14

GND

DNC

+5V

DNC

GPIO11

GPIO09

GPIO10

DNC

GPIO22

GPIO27

GPIO17

DNC

GPIO4

GPIO3

GPIO2

+3.3V B

CM#s:

GPIO11

GPIO10

GPIO6

DNC

GPIO5

GPIO4

DNC

GPIO1

GPIO16

GPIO15

GND

DNC

+5V

DNC

G

PIO14

G

PIO13

G

PIO12

DNC

GPIO3

GPIO2

GPIO0

DNC

GPIO7

GPIO9

GPIO8

+3.3V

WiringPi#s:

Applying +5V to the Test Point 1 node (TP1) andgrounding the Test Point 2 (TP2) will supply power to

the Raspberry Pi if you do not wish to use the MicroUSB to supply power.

JUMPER