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I am trying to make a circuit so I can use an arduino to change the rotation of a dc motor , so I am thinking about using an H-bridge made of a DPDT relay connected to the arduino. Would it work? Also can u draw me a diagram of how a DPDT relay H bridge would look like?

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  • \$\begingroup\$ I’d replace the relays with mosfets. \$\endgroup\$ – electrophile Apr 23 at 7:15
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    \$\begingroup\$ You have two basic kinds of DPDT relays: "make before break" and "break before make." You'll need to first decide which of these you prefer. The 1st will short out your power supply, but that may be acceptable. The 2nd will let the motor free-spin a bit, but that may also be acceptable. You could also consider the case where you short out the motor contacts for a moment (but without shorting the power supply), as this case will cause the motor to "self-brake." That may also be desired. If so, again you need to let us understand what you expect during the transition. \$\endgroup\$ – jonk Apr 23 at 7:22
  • \$\begingroup\$ Hi, I see that you are a new user. In general we don't just do your design work for you. We help when there is an indication that you have done enough work by yourself to start with. You can just google how a DPDT H-Bridge would look like, and post how you think it should be with a schematic. Then we can suggest improvements or alternatives. \$\endgroup\$ – Emre Mutlu Apr 24 at 10:22
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This will reverse the direction of the motor. The separate switch MOSFET is used to turn the motor on and off, or control the speed via PWM.

schematic

simulate this circuit – Schematic created using CircuitLab

If the motor is reversed while it is still spinning it will be braked by D1 even if the MOSFET is off (and you would probably want to ensure that it is off until the motor is stopped).

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