I have a TM1638 board with 8 seven-segment displays, 8 LEDS, and 8 buttons. Each time multiples leds are on, the board makes an annoying high pitch sound.

I'm controlling it with an Arduino Uno.

Should I worry about the sound and is it normal?

This is my board :

enter image description here

  • What board do you have? – Majenko Aug 7 '18 at 15:13
  • check your ground connections – Chad G Aug 7 '18 at 18:08
  • 3
    Where does the sound come from exactly? When your LEDs are on, they draw power from the power supply. Cheap switching power supplies will exhibit a ringing sound under load (Spulenfiepen / coil whining, en.wikipedia.org/wiki/…) – Maximilian Gerhardt Aug 7 '18 at 19:37

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