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I'm designing a rocket launch controller, that incorporates an Arduino to provide a safer and more controlled launch. Original rocket launch controllers used to use an incandescent light bulb and a button that when pressed it would allow enough current to flow through and launch the rocket (see below schematic).

schematic

simulate this circuit – Schematic created using CircuitLab

What I'm trying to do is use the Arduino to verify that the circuit is closed and then use a MOSFET to provide the correct voltage and current for the rocket motor starter to launch the rocket. How would I prevent 12V from going into D3 and A1?

schematic

simulate this circuit

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  • \$\begingroup\$ " How would I prevent 12v from going into D3 and A1?" is the wrong question and this is the wrong design. You need a valid spec. For reliable pre-launch and safe launch with some consideration of potential EMI risks. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 19 '19 at 8:02
  • \$\begingroup\$ Where is the Arduino ground connected in this circuit? \$\endgroup\$ – Elliot Alderson Nov 19 '19 at 16:27
  • \$\begingroup\$ Tony, what emi risks would there be? \$\endgroup\$ – Austinthemighty Nov 19 '19 at 18:53
  • \$\begingroup\$ @Elliot Alderson Gnd is connected to the Gnd pin on the Arduino, forgot to throw that in. \$\endgroup\$ – Austinthemighty Nov 19 '19 at 18:55

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