PCA9685 vs L298N: Which Motor Driver Board to Choose
By Kunkune | Published: 2026-10-25
Category: Comparisons
Compare the PCA9685 servo shield and L298N motor driver for your robot project. Learn when to use I2C servo control vs H-bridge DC motor driving.
Quick answer
Choose the PCA9685 servo shield if you need to control multiple servos or LEDs over I2C. Choose the L298N motor driver if you need to drive DC or stepper motors with an H-bridge circuit.
What each board does best
The PCA9685 is a 16-channel PWM controller designed for servos and LEDs. It communicates via I2C, making it ideal for Raspberry Pi or Arduino projects that need many independent outputs without loading the main processor.
The L298N is a dual H-bridge driver that handles DC motors and stepper motors. It uses screw terminals for easy wiring and includes an on-board 5V regulator, so you only need one supply voltage (6-12V).
Key differences in control
The PCA9685 outputs PWM signals but does not drive motors directly. It requires servos or LEDs that accept PWM. The L298N drives motors directly by switching voltage and direction.
The PCA9685 uses I2C for commands, which simplifies wiring when you need many channels. The L298N uses simple digital signals (forward, reverse, stop) from a microcontroller like an Arduino.
Trade-offs at a glance
- Motor type supported: PCA9685: servos and LEDs (PWM input). L298N: DC motors and stepper motors (direct drive).
- Control interface: PCA9685 uses I2C (multiple channels, one bus). L298N uses simple digital signals (one pair per motor).
- Power and wiring: PCA9685 needs external power for servos. L298N includes a 5V regulator and screw terminals for 6-12V input. Check your project's voltage and current requirements before choosing.
Product facts
- PCA9685PW 16-Channel I2C Servo Shield and LED PWM Driver Board For Raspberry Pi: 16-channel I2C servo shield and LED PWM driver board for Raspberry Pi. You can control up to 16 servos or LEDs from a single I2C connection, freeing up GPIO pins and processing power.
PCA9685PW 16-Channel I2C Servo Shield and LED PWM Driver Board For Raspberry Pi - L298N Dual H Bridge Stepper Motor Driver Board: Dual H-bridge stepper motor driver board that controls two DC motors independently or one stepper motor. It drives motors directly with screw terminals, making it practical for robot chassis and other motorized projects.
L298N Dual H Bridge Stepper Motor Driver Board
Which board fits your project?
Best for
- Projects needing many servo or LED outputs, such as robot arms, animatronics, or lighting arrays
- Raspberry Pi or I2C-based systems where pin count is limited
Not for
- Driving DC or stepper motors directly
- High-current motor applications (the L298N handles motors, not the PCA9685)
