OpenELAB Dual Motor Driver

Overview

Dual H-bridge motor driver based on TB6612FNG. Drives two DC motors or one stepper motor. Compact, efficient, with breadboard-friendly pin headers.

Features

• TB6612FNG dual H-bridge
• 2 DC motors (bidirectional) or 1 stepper (4-wire)
• Motor voltage: 4.5–13.5V
• Logic voltage: 2.7–5.5V
• Continuous current: 1.2A/ch (3.2A peak)
• PWM speed control + direction pins
• STBY (standby) pin for low-power mode
• Reverse-polarity protection on motor power

Wiring

Driver Pin	Arduino Pin
VM	Motor power (battery)
VCC	5V (Arduino)
GND	Common GND
AIN1	D7
AIN2	D8
PWMA	D9 (PWM)
BIN1	D10
BIN2	D11
PWMB	D6 (PWM)
STBY	D12

Quick Start (Arduino)

#define AIN1 7; #define AIN2 8; #define PWMA 9
void setup() {
  pinMode(AIN1, OUTPUT); pinMode(AIN2, OUTPUT);
  pinMode(12, OUTPUT); digitalWrite(12, HIGH); // STBY
}
void loop() {
  digitalWrite(AIN1, HIGH); digitalWrite(AIN2, LOW);
  analogWrite(PWMA, 128); // 50% speed forward
  delay(2000);
  digitalWrite(AIN1, LOW); digitalWrite(AIN2, HIGH);
  delay(2000); // Reverse
}

Applications

• Robot chassis drive (2-wheel differential)
• Conveyor belt control
• Small CNC/plotter axis
• Stepper motor control (bipolar 4-wire)

Resources

• Schematic + PCB: Schematic and 3D files will be linked here when published.
• Dev Board Selection