3X3X3 LED Cube Circuit Principle:
This circuit is based on the principle of driving LEDs using the clock pulses. The idea is to make the cube glow in gradual transition from one set of trio to each face of the cube to the whole cube itself. This is achieved by using two counters such that the first counter comes to play for first nine pulses and each of the trio of LEDs glow for each pulse. The second counter comes to play from the 10th pulse and each face of the cube starts glowing. The clock pulses are given using a 555 timer arranged in astable mode.
3X3X3 LED Cube Circuit Diagram:
3X3X3 LED Cube Circuit Design:
First part of design involves designing 555 Timer as an astable multivibrator. Here we assume our required time period to be around 1 second. As the frequency of output signal given by f = 1.44/ (Ra+Rb) C and values of C assumed to be around 100uF, we calculate the values of both the resistors to be around 10K. Second part of the design involves designing the counter unit. Since here we are using only one counter, the divide by 10 output pin is left unconnected. In cascading operation the divide by 10 output pin or the carry out pin is connected to either the clock pin or carry out pin of another counter. The master reset pin and the clock enable pins are both connected to ground. The third and the most important part involve designing the LED cube circuit. We achieve this by arranging 9 set of a series trio of LEDs in a cubical manner such that for each trio, the cathode of each LED is connected to the anode of another and each trio of LEDs is connected in parallel to another such that the cathodes of upper LEDs are connected to each other, resulting in a 3 by 3 by 3 LED cube arrangement. Anodes of all the LEDs are connected together to the ground potential.
Working of 3X3X3 LED Cube Circuit
The circuit operation commences once the switch S1 is bought to closed position. 555 Timer IC produces the required clock pulses used to trigger the counters. This is achieved by the astable operation of 555 timer used to produce high and low clock pulses of required interval. Output pulse from the IC is fed to the two counter ICs in parallel arrangement, so as to give the clock signals simultaneously. Here the two counters are arranged in cascading arrangement. The IC 4017 consists of a 5 stages Johnson counter and display decoder circuitry. It produces a high logic signal at its output every time the input clock pulse is a high logic signal. In other words for each positive clock pulse received the counter output at the corresponding output pin will go high. The counter IC will function till the reset pin and clock enable pins are grounded. Since each output pin is connected to each of the series arrangement of LEDs, every time one of the output pins is at logic high, the corresponding series of LEDs would glow. For example for the first clock pulse when pin 3 of the counter IC goes high, the connected trio of LEDs start glowing. For the first 9 pulses, the each trio of LEDs glows. Thus this circuit displays a spectacular view of the LED cube wherein for each clock pulse, each trio of LEDs glow and since time period of clock pulses is quite low, and the cube appears to blink.
3X3X3 LED Cube Circuit Applications:
3X3X3 LED Cube Circuit Limitations:
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