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I am trying to make a small robot with 4 12 v DC Motor + Raspberry PI + camera possibly a USB camera.

I am very confused with power source. Is it possible to get all of them powered by a single power source? Can you recommend some of them? I am really in a need. Also is there any software where I can design electric circuit of this robot before burning my actual hardware.

Edit: I have 4 dc 12 v motors with 60 mamp without load and 300 mamps with load and it have torque of 1.5 kgcm

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    $\begingroup$ Welcome on Robotics @RahuIAN, for power source there are two important factor the voltage and the amps. Please complete your questions with the current consumption of your devices $\endgroup$
    – N. Staub
    Sep 16, 2018 at 12:37

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I would recommend using only one source of energy on your robot otherwise, you could have some grounds problems.

Your motors are not consuming a lot (max ~ 1.2 Amps) and you can consider that the Raspberry Pi could consume up to 3A if you plug your camera (Could be less but with 3A your are safe).

So in your case, I would use a 12V battery with a DC/DC converter to power to Raspberry Pi in 5V (Here you need to make sure that the converter can deliver 3 A in 5V from a 12V source, like this one).

For the kind of battery, if you don't care about the size, capacity, weight etc you can go for a Lead–acid battery that is cheap and easy to use (Like this one). Otherwise, you can check for a Lithium-ion battery for example that has more capacity for the same size/weight. Lithium batteries are mostly more expansive and could be dangerous if you are not charging/discharging properly.

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  • $\begingroup$ It really doesn't matter how many power sources you use, as long as they all use a common ground. $\endgroup$
    – sempaiscuba
    Sep 19, 2018 at 9:57
  • $\begingroup$ Can you recommend any design software where I can simulate the circuit.? $\endgroup$
    – RahulAN
    Sep 20, 2018 at 8:35
  • $\begingroup$ I don't know much about circuit simulation but can have a look at Simulink from Matlab $\endgroup$
    – GuillaumeB
    Sep 20, 2018 at 9:23

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