It is very simple and easy to construct a project on electronic dice circuit that will display random numbers from 1 to 6 on the 7 segment display. It is based on IC CD4017 and NE555. This is an alternative device that can be used to replace the traditional dice when playing games such as snake ladder, monopoly etc. While NE555 is a well known multivibrator IC, CD4107 is a medium speed Johnson Counter that works at 10MHz and has 8 decoded ouptuts.
CD 4017 ICs are widely used in frequency dividers, binary counters, divide by N counters and register design applications.Shown below is the pin diagram of 4017:
Fig. 1: Pin Diagram Of CD 4017 ICs
Push switch is pressed to throw the dice. This makes the circuit of the project to rapidly move through the dice numbers. A random number is displayed by the LEDs when the switch is released.
The clock pulse is provided by the 555 astable circuit at about 5 KHz for the 4017 counter which contains ten outputs (Q0 to Q9). Each output becomes high when the clock pulses are received by them. As only six outputs (Q0-Q5) are needed so Q6 is connected to reset. Appropriate outputs are connected through the diodes so as to supply the LEDs: for example Q1, Q3 and Q5 are combined for LED 1.
To use less number of diodes and to simplify the circuit the sequence starts from 2. So that ÷ 10 output can be used for LEDs 6 and 7. Counting occurs when the push switch makes the disable input low.
Filed Under: 555 Timers, Electronic Projects