In this ESP32 74HC595 project, we will interface three 74HC595 using only three pins and connect three 7-Segment displays to see outputs using only three pins from the ESP32 which is a WiFi/BT enabled microcontroller device that is a popular choice for many IoT based projects. Therefore, one can use three output pins from the microcontroller unit and cascade two or more shift registers to get 16 or 24+ output pins. We have previously this IC with other microcontrollers as well Other than the power pins, it requires only 3 pins that need to control multiple shift registers. 74HC595 is a shift register that takes serial data as an input and provides parallel output. For such cases, where multiple output pins are required but the microcontroller has a limited number of output pins, 74HC595 Shift Register would be a perfect choice. All microcontrollers have specific numbers of IO pins but in some applications, like in a 7-Segment Display, we will need more GPIO pins than what our controller could offer.
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