Good evening!
I want to make
car on remote control
with Arduino Uno.
For that I want 4 wheels active spinning.
I use L298N for controlling two motor of wheels.
To power L298N I need 5V from arduino and 12V from other sources.
How much volts do I need to power for two L298N and how to do it effectively? 
To do what you want "effectively", I'd say dump the last century L298N.
That depends on the motors which You have not specified by a datasheet link.
Preferably use modern MOSFET based drivers and not the stone age L298, unless You need heating in the car.
Can you please tell me examples of modern drivers?
Can you please tell us about your motors?
(See how this works?)
Pololu has a good selection on DC brushed motor drivers.
Choose the motor driver based on the stall current of the motor and the motor supply voltage. The stall current can be several times the running current. The stall current will be drawn, briefly, every time that the motor is started. The stall current should be listed in the motor data sheet. In the absence of a data sheet, the stall current can be estimated. To estimate the stall current, measure the motor winding resistance. Zero your meter lead resistance before measuring the motor coil resistance*. Take several measurements rotating the motor a bit between readings. Use the lowest reading in the calculation. The estimated stall current is the motor supply voltage divided by the true coil resistance.
*Touch the Ohmeter leads together and note the lead resistance. Subtract the lead resistance from the measured coil resistances to get true coil resistance.
Some motor drivers have current limiting built in. You can use a driver that has a max current less than the motor stall current if the driver can control the current and the limited current is sufficient to start the motor under use conditions.
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.