Arduino UNO

5v
GND

Encoder 1

SW - pin 5
DT - pin 4
CLK - pin 2

Encoder 2

SW - pin 6
DT - pin 7
CLK - pin 3

LED RGB

R - pin 10~
G - pin 9~
B - pin 11~
5v

Raspberry pi 3

5v - pin 2
GND - pin 9

Encoder 1

SW - pin 7 - BCM 4
DT - pin 11 - BCM 17
CLK - pin 12 - BCM 18

Encoder 2

SW - pin 13 - BCM 27
DT - pin 15 - BCM 22
CLK - pin 16 - BCM 23

Encoder 3

SW - pin 18 - BCM 24
DT - pin 22 - BCM 25
CLK - pin 37 - BCM 26