![]() To simplify the use of the 74HC595 chip, you can use special libraries. The reverse switch ensures that the reception of information is terminated. The inputs DS, SH_CP, and ST_CP are used to control the shift register: when the position of SH_CP changes from LOW to HIGH, 1 bit is read from input DS. Then, they are connected to the power rail for the normal operation of the Vcc register and the MR input. In case only one register is used, the second one is grounded. When one is active, the other is put into a high impedance state. This makes it efficient to control different registers with the same elements. In addition, all pins of the shift register have high resistance so that the operation of the chip is not affected by the possibility of changing the voltage at the outputs with other elements. The pinout of the microchip is very simple due to the special marking in the form of a circle, from which the pin counting starts. The thing is that all chip outputs will have one of two logical values – 0 or 1.Īs a result, when using dimmable LEDs, you should pay maximum attention to the drivers.ģ Useful Video: 74HC595 and 74HC165 Shift Registers with Arduino 74HC595 Chip Design and Pinout The disadvantage of using 74HC595 chips is that it is impossible to implement PWM – pulse width modulation. In this case, the number of connected devices will increase by a multiple of eight with each chip, and the number of pins of the Arduino will remain equal to three. The economy of using this chip is visible to the naked eye, but if this is not enough, you can connect the shift registers in a cascade (i.e., one after the other, in a chain). For example, the 74HC595 can connect up to eight devices with only three controller pins! The bit depth of the chip used is the basic characteristic of the shift register. Moreover, there is a serious problem of synchronizing two controllers in such a case, which is much more challenging to solve.Ī more elegant way is to use the output shift register, an eight-bit 74HC595 chip, for example. On the surface, there is a ready solution – to buy another microcontroller, but this is expensive and not pragmatic. A set of breadboard “daddy/paddy” wires.To implement the project in this article, we will need the following components: ![]() ![]() The standard outputs of the Arduino Nano may not be enough.Įven if you have an Arduino Mega with 54 outputs at hand, real-world applications may require much more. ![]() For example, when connecting your first LED to the microcontroller, the circuit designer thinks about connecting 10-20 LEDs. Once all the training examples are mastered, the real-world tasks put this problem at the top of the agenda. One of the priority issues for novice circuit designers is having the optimum number of outputs. ![]()
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