16-channel relay box controlled by a Raspberry Pi

It's not quite finished yet, but it's in a usable state. This isn't full instructions, but hopefully enough to get you started if you're interested. Please comment below if you'd like more information.

Some of the Parts:

8-Channel 5V Relay Board (two of these)

Raspberry Pi, SD card, associated cables

female to female jumper wire for connecting Raspberry Pi GPIO pins to relay board pins

thick wire for connecting relays to outlets

nine outlets

CNC or laser-cut front plate from this drawing

LightShow Pi software (haven't tried this yet)

An example Python script to flash through the relays one at a time:

import time

delayTime = 0.25

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)

pins = [2, 3, 4, 17, 27, 22, 10, 9, 14, 15, 18, 23, 24, 25, 8, 7]

for pin in pins:

    GPIO.setup(pin, GPIO.OUT) 

    GPIO.output(pin, GPIO.HIGH)

    time.sleep(delayTime)

    GPIO.output(pin, GPIO.LOW)

    time.sleep(delayTime)

GPIO.cleanup