Light Sequenced Candelabra

This circuit, controlled by a microcontroller, makes the lights on the candelabra/chandelier turn on one at a time when power is applied.  There is a switch on the circuit board that allows you to have it go through the turn-on sequence and then all stay on or wait about 20 seconds and turn all the lights off and start the sequence again and repeat.  It can handle up to five lights, 60W or below.  I used neon flicker bulbs in mine.

Mine is actually a chandelier,   but it works just the same.  Thanks have to go to Christopher Silvia (a.k.a. the Isolated Looney)  for his idea to have the lights sequence in the first place.  Visit his crypt at .  Chris has done some beautiful Halloween work.

Click the following to see how to build this project:

schematic, code, circuit board layout, and parts list

For completed units or kits of parts, please go to:

Cowlacious Designs


Note:  For those not used to reading a schematic, crossing wires are not connected to each other.

Parts List

    Where to get it: Cat. #
R1-R5 1.5K Ohm Resistor, 1/4W    
R6 10K Ohm Resistor, 1/4W    
R7 1K Ohm Resistor, 1/4W    
L1-L5 Incandecent bulb up to 60W.  You can also use the neon flicker bulbs that are so popular for Halloween.    
Q1-Q5 L401E3 logic TRIAC Digi-Key L401E3-ND
S1 SPDT Switch Jameco Electronics


C2 2.2uF Capacitor, 250V - Schematic is wrong, parts list is right. Digi-Key


D1 1N4004 Diode Digi-Key 1N4004DICT-ND
D2 1N4734A Zener Diode, 1W Digi-Key 1N4743AMSCT-ND
C1 470uF Capacitor, 16V axial lead    
U1 PIC12C508 - Requires being program with the code below. Jameco Electronics






P1 Polarized line cord - It is just a lamp cord, but it has one prong that is wider than the other. NOTE:   It is critical to this circuits operation and your safety that the line cord is polarized and properly connected.    

Microcontroller Code

Click here to download a zipped package of the files.  The zip file contains all the source code and the hex file necessary for programming the microcontroller.

Circuit Board Layout

Click here to see the circuit board layout.  It is done as a PDF file so that if you want to print it and use it to make your own board, it will keep the proper aspect ratio etc.

Back to my Halloween Projects Page

Back to my Halloween Home Page 


Carl Cowley
Copyright 2000, 2001  All rights reserved.
Revised: August 30, 2002