Arduino UNO +74hc164 water lamp example

Arduino UNO +74HC164 Water lamp example

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• Proteus demonstration
  

74HC164 brief introduction

74hc164 It's a digital chip , Inside is a high-speed silicon gate CMOS circuit , Pin and low power Schottky TTL（LSTTL） Family compatibility .74hc164 yes 8 String in and parallel out of bits 、 Edge triggered shift register , The concatenated data consists of DSA、DSB Input , On every clock CP The rising edge of the data moves one bit to the right , Data from DSA and DSB With each other , And the establishment time has been met before the rising edge . The low-level effective reset signal will directly clear the register and output it as low . Two inputs may be connected together , Or connect the unused input terminal to high level , Don't hang in the air .

• effect

1. logic function ：74hc164 yes 8 Displacement bit register

2. Shift register is a kind of memory , The data stored inside can move from low to high or from high to low .

   For example, one 8 Bit shift register , The existing data is 11001010, If left ( High position ) Move once , It becomes 1001010X, The original highest position 1 Removed from the , The lowest X It can be newly moved data ÿ