L298N with Arduino Uno R3

Wiring for the L298N dual motor driver on the Arduino Uno R3 (ATmega328P, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

L298N pin	Role	Arduino Uno R3 pin	Notes
ENA	Input to the part	2 (PD2)	Motor A speed (PWM). Remove the jumper to use it
IN1	Input to the part	~3 (PD3)	Motor A direction
IN2	Input to the part	4 (PD4)	Motor A direction
IN3	Input to the part	~5 (PD5)	Motor B direction
IN4	Input to the part	~6 (PD6)	Motor B direction
ENB	Input to the part	7 (PD7)	Motor B speed (PWM). Remove the jumper to use it
12V	Not wired to the board	not connected	Motor supply 5 to 35 V from a separate supply
GND	Ground	GND
5V	Not wired to the board	not connected	5 V output of the on-board regulator (jumper on, supply up to 12 V)
OUT1	Not wired to the board	not connected	Motor A
OUT2	Not wired to the board	not connected	Motor A
OUT3	Not wired to the board	not connected	Motor B
OUT4	Not wired to the board	not connected	Motor B

Check before you power it on

Motors, servos, relays and LED strips can draw more current than the Arduino Uno R3’s pins or USB can give. Power them separately and connect the grounds together.

Test code (Arduino)

// Motor A: ENA = speed (PWM), IN1/IN2 = direction. Remove the ENA jumper on the module.
void setup() {
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
}

void loop() {
  digitalWrite(3, HIGH);
  digitalWrite(4, LOW);
  analogWrite(2, 180);  // about 70% speed
  delay(2000);
  analogWrite(2, 0);    // stop
  delay(1000);
}

Arduino board: arduino:avr:uno.

Questions

Which Arduino Uno R3 pins do I use for the L298N?

ENA → 2 (PD2), IN1 → ~3 (PD3), IN2 → 4 (PD4), IN3 → ~5 (PD5), IN4 → ~6 (PD6), ENB → 7 (PD7), GND → GND.

Does the L298N work with the Arduino Uno R3 at 5 V?

Yes: the L298N runs at 5 V and the Arduino Uno R3 uses 5 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Uno R3 pinout · L298N dual motor driver: all pins and data

The L298N on other boards

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