Arduino Mega resetting on touch

Official Hardware Mega Mega 2560
1

Hi all,
I have a Arduino Mega that is driving a stepper motor via an external stepper driver. I have input to the system via 4 proximity switches.
The stepper is powered eith 24V. The Arduino is powered by a cheap buck converter that feeds it with 7V. This way I can use the 7V also for the proximity switches that need at least 6V as power (output of the proximity switches is around 4v).

Now my problem: The system works fine for quite some time. Then when I touch e.g. the linear rail it will reset itself.

The powersupply is not connected to earth/ground fault. Only N and L are connected.

Please help..

2

You have a grounding issue. All your grounds need to be tied together (power supplies, stepper, mega, etc.) You are most likely discharging some static electricity when you touch things.

1 Like
3

So the 220V outlets ground to the psu, to the arduino GRD, to the stepper driver GRD all together..
Should I ground the mechanics too?

4

Unfortunately did not help. I even tried another Arduino Mega. Any other suggestions?

5

I used to have an external reset button but attempts to:

  • Removing the button
  • inserting a pullup resistor (60k)
  • inserting a capacitor (1uF)
  • inserting a pullup resistor (60k) together with a capacitor (1uF) (this actually resulted in erratic behaviour)
  • Removing (Bending) header-pin to reset pin

all failed..

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