Raspberry Pi 8 bit uln2803 8 relay board can direct control by Raspberry GPIO pin.

or use for 23017 23s17 23008 GPIO port

1. J10 (2P Block terminal) & Mini USB for 5V input for Relay & 2803

2. U5 ULN2803 8 darlington transistor array

3.J20 pin 1 to 10 ( for signal input)

(D0, D1,D2,D3,D4,D5,D6,D7,GND,Vcc)

OUTPUTwith D0~ D7 LED

D0,D1,D2,D3,D4,D5,D6,D7 control Relay 1,2,3,4,5,6,7,8

4. J17 J15 J25 J24 J34 J35 J36 J37 Relay 1,2,3,4,5,6,7,8 Disable

Plug-in - enable,remove – disable

5, J38 PIN 1 to 5 (Vcc, D0, D1,D2,D3 )

J28 pin 1 to 5 (Vcc, D4, D5, D6, D7 )

6. J21 Vcc input Disable from J11

Plug-in - enable, remove - disable disable disable disable

ULN2803 can use RS-Pi pin 11,12,13,15,16,18,22,7 as

GPIO 0 to GPIO 7 for input