There must either be a resistor connected to each cathode, or to each anode. LEDs always need a current limiting resistor, so never directly connect the cathodes to GND. Afterwards all of the LED cathodes can be joined and taken down to GND with one 2k2 resistor. It is possible to connect each anode of each LED to it's corresponding pin on U2 directly without a resistor. The number of the LED, counting from the left, that is on will be the number that was 'thrown' on the dice. To throw the dice, close the switch and then open it. Completed Electronic Dice Breadboard Circuit Operating the Electronic Dice CircuitĪfter connecting the battery, one of the LEDs will switch on. C1 and R7 have been connected to U1 and wired to the push button switch. The circuit has now been completed by connecting the LED anodes to U2. This makes no difference to the way the circuit operates.

In the breadboard image, the LEDs are connected to U2 and then to the resistors. in the circuit diagram, the resistors connect to U2 and then to the LEDs. The position of the LEDs and resistors have been swapped around on this breadboard circuit. Each cathode of each LED is connected to GND with a 2k2 resistor. Six LEDs have been inserted with the anodes (longer LED lead) to the left. The connection from pin 13 of U1 to pin 14 of U2 has been made. In the next photo, the connection between pin 5 and 15 of U2 has been made. ICs and Switch on Breadboard IC Connections and LEDs A push button switch has also been inserted into the breadboard. All IC pins that are shown to be connected to +9V and GND (negative or 0V) in the circuit diagram have been made on the breadboard. In the following photo, all power connections have been made from the ICs to the horizontal rails. Your breadboard may have continuous top and bottom horizontal rails that don't need to be connected. The orange jumpers connect the the left and right horizontal rails of each set. This is made possible by the two wires (red and black) on the left of the photo that connect positive and negative from the top horizontal rails to the bottom horizontal rails.

The bottom horizontal rail is used for negative connections and the one above it is used for positive connections. The horizontal rail just below it is used for the negative (or GND) connection. In the photos that follow, the breadboard top horizontal rail is used for the positive battery and circuit connections. Don't wear clothes that are known to enhance the generation of static electricity.īuilding the Electronic Dice Breadboard CircuitĬlick any of the breadboard pictures that follow for a bigger image of the electronic dice breadboard circuit.Don't work on a surface that is known to enhance static electricity generation.When building the circuit, this can help to prevent a static discharge that could destroy the ICs. Handling the bag and the breadboard at the same time should cause both to be at the same potential.The ICs should have been shipped to you in a silver colored static shielding bag.There are some precautions that can be taken: Not every hobbyist will have this equipment or want to spend the money on it. Strictly speaking, an anti-static bench mat and wrist strap should be used when handling and working with these ICs. The static electricity from your body or other sources can destroy or partly destroy the IC. Electronic Dice Circuit Diagram 40 IC Pinouts Static Sensitive Partsįirst note that the two 4000 series logic ICs (40) are sensitive to static electricity. The power and ground pin numbers are usually shown in a text box as you can see in this circuit. This makes the schematic diagram simpler, especially when a number of ICs are used. Sometimes the schematic symbol of an IC will not show the power and ground pins of the IC, as is the case in this circuit. The outlines with pin numbering of these two ICs are shown below the circuit diagram. New in this tutorial is the two 4000 series logic ICs, the 40. In addition to a breadboard, wire links, 9V battery and battery clip, you will need: QtyĬlick the electronic dice circuit diagram below for a bigger image. PrerequisitesĪs a minimum, finish tutorial 5 (555 LED Flasher). The circuit can be seen operating in the following video. If the second LED lights up, the value thrown is 2, if the fifth LED lights up, the value thrown is 5, and so on. The LEDs have values from left to right of one to six.

Arduino led dice