Hi,

The firmware code seems to assume that the buzzer is a piezo sounder that needs to be driven with the frequency at which it should beep ("Resonant frequency of the piezo sounder is 4.5kHz.")
However at least on PanelDue V3 I only see parts that seem to be DC buzzers with their own oscillator (with a little "+" mark on the housing).
Did the type of buzzer change over time / versions?

Thanks
Michael

Thanks for the clarification!
Indeed when having a closer look at an original PCB, the little mark is an "S", not a "+". I guess I got confused by looking at some pictures in a web search, which showed cloned PCBs.

Hi,

The firmware code seems to assume that the buzzer is a piezo sounder that needs to be driven with the frequency at which it should beep ("Resonant frequency of the piezo sounder is 4.5kHz.")
However at least on PanelDue V3 I only see parts that seem to be DC buzzers with their own oscillator (with a little "+" mark on the housing).
Did the type of buzzer change over time / versions?

Thanks
Michael

Hmm... The PanelDue 3.0 buzzer seems to be a DC version that has a built-in frequency generator and a little "+" on the housing indicating its polarity?
Was that different in earlier versions?

Thank you for all the suggestions!
And yes, I will add a thermal fuse as well.

Hi,

After an unpleasant thermal runaway experience where an ATMEGA had a defect that made it keep sensing room temperature while continuously heating the bed (500W),
I thought that I want to add a 2nd redundant bed temperature sensor.

What is the recommend way to do that in RRF3.1.1?

Thanks
Michael