This Instructable offers a walk-though of the "Electronic Dice Kit" assembly.
This kit is available at etsy and ebay.
This kit comes with everything needed to complete the project (shown below) including a battery.
This is a nice kit for beginners to learn to work with solder, or anyone looking to spice up a game of Monopoly...or Chess.
There is a single momentary button, when it is held, a random number will light as it would be displayed on a die.
Step 1: Installing the Trigger.
The trigger is your button to cal upon a random number. While the button is held, a number will display. When you let up on the trigger, the display will go out. The button does not have polarity, and can not be wired incorrectly due to a rectangular footprint. The trigger holds it's self in the board well enough to not need help while soldering. There are four solder points which will need completed on the underside of the board to secure the trigger.
Step 2: Installing LEDs
This device comes with seven LEDs. This is the focal point of the project, so we want it to look nice. Using a small piece of masking tape, you can hold the LED to the board. Otherwise, when the board is flipped over to solder, the LED is going to lean in to an unpleasing angle. After the LED is soldered in place, the extra leads can be removed.
The LEDs do have polarity, and CAN be installed wrong. If you look closely, the footprint of the LED is not a prefect circle. There is a flat side on the negative lead. You will also see the positive lead is longer. Take care to align the flat side of the diode's footprint with the flat side of the screenprinted footprint on the board. All of the LEDs do not point the same way. Check the polarity of each LED before soldering it in place.
Step 3: Power Brace
The battery is held in place by the brace. The brace is held in place with two solder points.
The positive side of the battery is the side with the writing, and that should face upward. The side with no writing should be touching the board it's self.
Step 4: Chip's Challenge
The board's controller should be the last component to be added. It is static sensitive, installing it last allows it to be left alone until needed, rather than needlessly moving while installing other components.
This chip is sensitive to which way you install it. Incorrect installation may result in a malfunction even after it is installed correctly.
In the controller, on one side there is a small circle. Make sure that circle is on the same side as the small square within the outline of the controller drawn on the board. The picture below illustrates the proper alignment. Once in place, each of the 8 pins will need soldered from the bottom of the board.
Step 5: Push Button & Case
Once assembled, the device should be ready to run. The roll will display as long as the button is pressed.