# Is this circuit possible?

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):

https://howtomechatronics.com/tutorials/arduino/arduino-dc-motor-control-tutorial-l298n-pwm-h-bridge/

The circuit I made is here:

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

• 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 Jan 6, 2021 at 21:44
• 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?? Jan 6, 2021 at 21:51
• H bridge can be represented by 4 SPST switches ... it may help you to revise your schematic Jan 6, 2021 at 21:55
• 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. Jan 6, 2021 at 22:40
• Thanks for all the help guys! I got some real new (basic) knowledge out of this :) Jan 7, 2021 at 9:34

You meant, something like this?

simulate this circuit – Schematic created using CircuitLab

• 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! Jan 7, 2021 at 9:28
• @Martijn1002 Edited for 3 motor drivers, you can edit copy/paste from my answer. Still, I don't understand what is your main question? Jan 7, 2021 at 9:39