Electronic Dice With Slowdown - 555 & 4017

Have your dice ever fallen off the table after you rolled them when playing a board game? Yes? Say no more because in this instructable I will show you how I made electronic dice with the famous integrated circuits 555 timer and 4017 johnson counter!

Step 1: Demonstration

I found these cheap chinese ebay kits and thought that some people might be interested in their schematic or PCB therefore I "cloned" their PCB so that anyone can make it themselves. Oh and I manage to do so without buying any of their kits, just from the pictures.

Step 2: Parts List

For this instructable you will need:

Electronic Dice PCB or perfboard

1x - 4017 johnson counter

1x - 555 timer

2x - BC557 or any other small signal PNP transistor

3x - BC547 or any other small signal NPNtransistor

6x - 5MM LED

1x - 1N4148 or any other general purpose diode

1x - tactile switch

1x - 9V battery clip (6f22)

1x - 3AA battery holder

1x - 1µF electrolytic capacitor

1x - 100nF ceramic capacitor

3x - 470Ω resistor

1x - 1kΩ resistor

9x - 10kΩ resistor

1x - 3.3MΩ resistor

1x - 4.7MΩ resistor

1x - 10MΩ resistor

Optional:

1x - 16pin DIP socket

1x - 8pin DIP socket

Step 3: Schematic and PCB

This circuit has to be powered by approximately 5V in order to work properly. 9V battery didn't work for me. This circuit offers plenty of features for the amount of components it consists of. I think that there are no more features needed(correct me if I'm wrong).

To make the schematic and the PCB I used a free program Cadsoft Eagle which I would recommend to anyone making schematics or PCBs.

Step 4: Etching the PCB

I did not make the video.
I etched the PCB with i guess "photographic method" - that would be the direct translation from my language. I printed out the PDF file from previous step on transparent foil and then shone through it on photosensitve PCB, then developed it in solution of sodium hydroxide and then etched it in ferric chloride. If you find it confusing just watch the video, It's very well explained. Also don't forget to orient the transparent foil on the PCB so that you can read the words written on it.