Electronic dice construction set
€10.00
Electronic dice kit. Has hole-mounted components and a 7-segment display.
| Title | Range | Discount |
|---|---|---|
| Discount for over 99 pieces | 99 + | €0.80 flat |
Description
Description
Thus is an electronic dice kit with hole-mounted components and a 7-segment display.
The dice is an electronic version of the classical version used in board games.
After pressing the button, the numbers slowly appear on display. When this change stops (approximately 2-3 seconds), the final result of the throw is displayed.
Assembly time 1-2 hours.
Recommended for:
Recommended for beginners, intermediate and advanced users.
Required for assembly:
Pliers, side cutters, and soldering iron are needed. – This is not included in the package. For operation, you need a 9V battery.
Specifications
Power supply: 9V.
Operating temperature range: 10-40 ° C
Assembly
Contents of the package:
PCB: 1 pc
Resistance: 1 x 330 Ohm, 1 x 680 Ohm, 1 x 1 kOhm, 2 x 22 kOhm, 1 x 100 kOhm
Transistor: 1 BC557
Capacitor: 1 piece 100 uF, 1 piece 1 uF
Diode: 10 pcs 1N4148
7-segment display: 1 pc
Timer IC: 1 piece NE555, 1 socket
Decade counter: 1 CD4017, 1 socket
BCD – 7 segment converter: 1 CD4511, 1 socket
Speaker: 1 piece,
Slide switch: 1 pc
Push button: 1 pc
Battery connector: 1 pc
Spacer and screw for assembly: 4-4 pcs
Parts:
Resistance:
Resistance limits the current flowing. You can determine with a resistance meter using the color markings. We use three different values for the Christmas tree: 120 Ohm (12 * 101), 220 Ohm (22 * 101), and 3.9 kOhm (39 * 102). W used 4, 5, or 6 bands for color marking: tolerance is the last mark, and the multiplier is the penultimate mark. The first 2-4 are the digits (mantissa).
| Color | Number | Multiplier (4 bars) | Tolerance |
| Black | 0 | *1 | |
| Brown | 1 | *10 | +-1% |
| Red | 2 | *100 | +-2% |
| Orange | 3 | *1000 | |
| Yellow | 4 | *10000 | |
| Green | 5 | *100000 | |
| Blue | 6 | *1000000 | |
| Violet | 7 | ||
| Grey | 8 | ||
| White | 9 | ||
| Gold | /10 | +-5% | |
| Silver | /100 | +-10% |
Capacitor:
- The capacitpr charges and discharges: it stores the charge and then discharges it. One of the used ones is an electrolyte capacitor. The polarity important for this. The negative foot is indicated by the strip on the side of the capacitor.
- Transistor: has three legs, between the base and emitter legs. If the voltage exceeds ~ 0.6 V, the current will start. As a result, it passes a much larger current between the legs called the emitter and the collector.
- Slide Switch: This closes or opens the circuit so that the operation can be turned on and off.
- Push Button: When pressed, shortens 2-2 feet.
- Speaker: This emits sound.
- Diode: Allows current to flow in one direction only. The negative side (cathode) is indicated by a black stripe.
- 7 Segment display: The LEDs in it illuminate 1-1 segments, from which the numbers are composed.
- NE555: IC used for timing. The status of its output depends on the voltage level of pins 2 and 6.
- CD4017: The next output in a row will always be active due to the pulses coming to the clock input.
- CD4511: Converts the BCD (Binary Coded Decimal) code on its input to drive the 7-segment display.
Assembly procedure:
- Solder the resistors, making sure they get the right value everywhere.
- Solder the diodes, paying attention to the direction of the anode-cathode.
- Now the slider is soldered.
- Solder the transistor according to the drawing on the panel.
- Solder the integrated circuit housings in the direction indicated on the panel.
- Solder the capacitors according to the polarity marked on the panel. (On electrolytic capacitors, the strip is the – polarity, this foot is shorter than the other).
- Now the speaker is soldered.
- Solder the pushbutton from the back of the panel.
- The display also goes to the back of the panel. The dot on the display should be on the side of the button.
- Solder the battery connector: red a +, black a -.
- Screw on the legs.
- Insert the ICs into the sockets in the correct orientation.
Assembly procedure:
- Check if you soldered the capacitor with the correct polarity.
- Test the circuit first using a laboratory power supply with a 9 V, 100 mA current limit.
- Turn on the dice with the slider.
Possible errors and their solution
If a number does not appear on the display or the display is incorrect, check the position of the diodes.
Functional description
The capacitor C1 on the left edge of the circuit diagram is used for energy storage. When the SW1 key is pressed, it is charged via R3, R4, and D0. The NE555 IC operates in astable multivibrator mode (no steady state, its output turns on and off) to produce a rectangular signal. The frequency of the generated signal when a button is pressed depends on the timer members: C2, R2, and R1. When the button is released, use the energy stored in C1 via R3. As the voltage in C1 decreases, the square wave produced slows down until the stored energy is depleted.
The square signal is used for two things: on the one hand, we control the transistor Q1 that drives the speaker, and on the other hand, it gives the clock signal of the IC of the CD4017. As the square signals are received, the decade counter always activates the next pin until it reaches the 7th pin, which is connected to its reset input. Then the round starts from the beginning.
The BCD-7 segment converter converts the BCD number connected to its input so that the corresponding numbers appear on the 7-segment display. To do this, we need to convert the outputs of our decade counter to BCD code (1: 0001, 2: 0010, 3: 0011, 4: 0100, 5: 0101, 6: 0110). This is accomplished with diodes.
So after turning on the slider, as long as you hold down the button, the numbers on the display will change quickly, and then when you release it, the speed of the change will slow down and stop at a number.
The number at which it stops depends on:
- How many charge the capacitor C1 has.
- What level of charge C2 is in and is being charged or discharged when the button is released
- At what number the counter is going.
These events happen much faster than human reaction time, so for us, the number we get is random (even if it’s not a real coincidence, since it comes from a circuit that works according to the laws of physics).
Possibility of modification
Logo replacement for 100+ orders.
Also available in boxes on request. Inquire from our colleagues!
Keywords
dice, KIT, 7 segments, display, perforated.
