I am making an electrical circuit for a school project, yet electrical engineering skills cease after Ohm's law :) Now I did some research but I find electric circuits harder to design than I had expected.

For the project, we need to control 6 12 V DC motors. We found that 4 of these motors need 1.2 A and 2 need 0.2 A. We control these motors with an Arduino, this Arduino needs 0.04 A. Motors and Arduino are powered separately by a 12 V DC transformer with max 5.83 A.

Since the motors need to rotate CW and CCW, a Dual H-Bridge DC Stepper Motor Driver - L298N is used and this driver drops the voltage by 2 V (from 12V input to 10 V output):


The circuit I made is here:


Now my question is: Is this a viable circuit or have I overlooked / misunderstood something? Thanks in advance!

  • \$\begingroup\$ Consider if you do not have a slow start control on current, the surge current is 10x max rated power. or 100x the idle no-load power at rated speed. So get mo-power (from Toronto) Measuring the motor DCR will tell you this.. Similar for light bulbs \$\endgroup\$ Jan 6, 2021 at 21:44
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    \$\begingroup\$ Why have you connected your arduino in parallel with the Door Motors? Is the Door Motor Driver intended to switch the arduino's power on and off?? \$\endgroup\$
    – brhans
    Jan 6, 2021 at 21:51
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    \$\begingroup\$ H bridge can be represented by 4 SPST switches ... it may help you to revise your schematic \$\endgroup\$
    – jsotola
    Jan 6, 2021 at 21:55
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    \$\begingroup\$ Edit the schematics, use block as Arduino, use another block for the H-bridge - it shall have supply inputs (2) and two outputs (motor), and so on. I can't understand what the Arduino is in series with a motor and where is the H-bridge. \$\endgroup\$ Jan 6, 2021 at 22:40
  • \$\begingroup\$ Thanks for all the help guys! I got some real new (basic) knowledge out of this :) \$\endgroup\$ Jan 7, 2021 at 9:34

1 Answer 1


You meant, something like this?


simulate this circuit – Schematic created using CircuitLab

  • \$\begingroup\$ Aaahh it makes much more sense now. I do have three drivers but that wouldn't matter for but for the current. Thanks alot Marko! \$\endgroup\$ Jan 7, 2021 at 9:28
  • \$\begingroup\$ @Martijn1002 Edited for 3 motor drivers, you can edit copy/paste from my answer. Still, I don't understand what is your main question? \$\endgroup\$ Jan 7, 2021 at 9:39

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