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/…) Aug 7 '18 at 19:37
  • I would guess it is a harmonic from the multiplex signal. Touch each part with a pencil eraser and see if it goes away. Can you change the voltage by maybe 0.02 volts and see if it changes. Without a schematic I can only guess. I have seen these symptoms before but not with this hardware.
    – Gil
    Mar 26 at 22:02

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