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I have connected the LCD by the 3 wire method using the LiquidCrystal595 library+74HC595 register shift; sometimes "hello world" is displayed but other times the LCD displays weird characters. How to solve this problem?

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The circuit

  • do you have a question? – jsotola Feb 9 at 19:27
  • I want to know how to solve this problem ? – aymane Feb 9 at 21:43
  • Could be a bad wire, breadboard connector or power issue. Add a capacitor on the power line to the 74595 (VCC/GND). The next step is to check the timing in the library. – Mikael Patel Feb 9 at 22:15

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