Have an Arduino triggering an LED array AND a MOSFET that burns a glow plug for 1 second, from the same power supply (3.7V 720mAh Lipo).

The issue is that when the mosfet is triggered, it seems to ground the circuit and buggers the LEDs and every thing else (grounding?) and no glow from the plug (bcz its basically a resistor to no where?)

Without the other stuff, it burns just fine --> Tried "blink" solo.

Can the circuit be isolated? Diode?

This is the MOSFET circuit used: enter image description here

  • \$\begingroup\$ and buggers the LEDs and every thing else What does that mean? Describe in detail what happens, try to describe it without drawing ANY conclusions / assumptions as that will steer the discussion in a direction that might be wrong. How much current does the "glow plug" use? What is the battery, 3.7 V 720 mAh is too generic, it does not tell us what current the battery can deliver. \$\endgroup\$ – Bimpelrekkie Oct 3 at 8:31
  • \$\begingroup\$ My guess: series resistance of the battery and its connections. When the "glow plug" is activated, the battery voltage drops low enough for the Arduino to reset. Possible solutions: use a battery with a lower internal resistance. Improve the wires that carry the current for the glow plug. Use separate wires between Arduino and battery (like a star-ground, see: analog.com/en/analog-dialogue/articles/… do this for battery supply as well). \$\endgroup\$ – Bimpelrekkie Oct 3 at 8:34
  • \$\begingroup\$ Maybe best solution: re-program the "brown out" detection voltage of the Arduino. You can set it to 1.8 V (instead of the default 2.7 V). This is a "fuse" setting meaning you will need a 2nd Arduino to use as a programmer. \$\endgroup\$ – Bimpelrekkie Oct 3 at 8:36
  • \$\begingroup\$ Please provide links to the manufacturer's datasheets for the battery and the glow plug. We need to know their detailed characteristics. \$\endgroup\$ – Elliot Alderson Oct 3 at 11:57

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