Programmable Electronic Dice
This is an example of a straightforward programmable electronic dice with a numeric display. These dice have a 4-way DIP switch that may be used to display any random number between "1" a…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
Programmable Electronic Dice is a electronics project. This is an example of a straightforward programmable electronic dice with a numeric display. These dice have a 4-way DIP switch that may be used to display any random number between "1" a…
- Source pages
- 467-469
- Named parts
- 1
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
MAXIMUM
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for MAXIMUM; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
Programmable Electronic Dice: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 1 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteThis is an example of a straightforward programmable electronic dice with a numeric display. These dice have a 4-way DIP switch that may be used to display any random number between "1" and "2," "1" and "3,"..... or "1" and "9." Programmable electronic dice circuit
IC1 is a dual 4-input Schmitt trigger NAND gate with the model number 74LS13. In order to establish a clock frequency of roughly 70 kHz, which is then sent to IC2, Gate N1 is utilized as an oscillator. This oscillator is constructed using resistor R2 and capacitor C1. The inputs of IC2 are loaded with data by Gate N2. The 74LS191 in IC2 is a presettable binary counter, and it has a facility for parallel loading. Whenever its pin 11 goes low, the data that is now present at its inputs D through A (which is '0001') appears at its outputs QD through QA. This occurs when all of the inner switches of the DIP switch are open and DIS1 displays the minimum count as '1' rather than '0'. Circuit operation The DIP switch's inner switches A, B, C, and D must be set in accordance with the table in order to get the appropriate dice range. For instance, if you want the electronic dice to count from 1 to 8, you would need to close switches A and D while leaving switches B and C open. The display quickly changes between the numbers '1' and '8' when the switch S1 is pressed. As soon as you let go of S1, the display will stop bouncing around, and it will stay on the most recent number.
When switch S1 is pressed, the count output can go from '0001' all the way up to the maximum count stated in the table under the heading 'Dice Range.' This occurs with the inner switches of the DIP switch in the locations specified in the table. As soon as you let go of switch S1, the most recent count that falls within the dice range will be displayed. The outputs of IC2 are displayed on a 7-segment display with a shared anode (LTS542) (DIS1). The BCD-to-7-segment decoder integrated circuit 7447 (IC3) is what drives the display. Resistance R8 controls the amount of current that flows through DIS1.
You built Programmable Electronic Dice.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
PC Based Candle Igniter
Ready to reuse what you learned in another project from the same track?
Start this project →