But when the jumper is disconnected, the L298N logic circuit needs to get its power from somewhere.so need to connect a 5V supply to that L298N '5V' pin. sudo apt-get install fritzing-parts sudo apt-get install fritzing-data sudo apt-get install fritzing (at least so far, so good) fruitoftheloom Posts: 27225 Joined: Tue 12:40 pm. When the jumper is connected, the L298N onboard 5V regulator will start working, which provides 5V to the L298N logic circuitry. It is a pin that provides power to the L298N's own logic circuitry.ĭepending on jumper being left in, or left out, that L298N '5V' pin is either a supply input pin, or a supply output pin. And rest of the circuit via 5v from arduino 5v pin. Hey all, I just got a L298N and connected it in a similar way as in this image (using only Output 1 for a simple DC motor): At the very first test I just connected a 8. That '5V' pin on the L298N isn't a 'logic' input pin. I am using 12v 7.3aH lead acid battery to power my NEMA17 motor and arduino by putting LM7805 on the VIN pin of arduino. with jumper removed, it becomes a voltage supply INPUT pin (instead of a 5V output pin). Here, the '5V' pin on the L298N then changes functionality/behaviour.

Removing the jumper is the right thing to do for supplying the L298N board with an external power supply (where the supply has an supply voltage GREATER than about 12V DC). Also, in another test I removed the jumper for the internal voltage supply and hooked the +5V logic input to the 5V Arduino source - and then a red LED turned on, which didn't happen before (still the same behaviour as before, though).

Fritzing part l298n