Motors & Drivers

Bringing your robotics and automation projects to life requires reliable motors and drivers. Whether you need high-torque DC gear motors for a smart car, precision servos for a robotic arm, or NEMA 17 stepper motors for a DIY 3D printer, we have the exact hardware. Backed by 20 years of electronic retail experience in Sham Shui Po, our technical team provides on-site component matching to ensure your microcontrollers and motor drivers work together seamlessly without power overloads.

Motor Types & Driver Specifications Guide

Selecting the correct motor and pairing it with the appropriate driver board is crucial for achieving the desired motion and protecting your microcontroller. Here is a technical breakdown of our core motion components:

Motor / Driver Type Key Technical Features Best Use Case
DC Gear Motors (TT Motors) Continuous rotation, built-in reduction gearbox for higher torque. Driving the wheels of 2WD/4WD smart robot cars and conveyor belts.
Servo Motors (SG90 / MG996R) Precise angular control (usually 0°-180°), built-in feedback loop. Robotic arm joints, steering mechanisms, and camera pan-tilt mounts.
Stepper Motors (NEMA 17) Moves in exact discrete steps (e.g., 1.8° per step), high holding torque. 3D printers, CNC machines, and precise linear actuators.
Motor Driver Boards L298N (H-Bridge), A4988 (Stepper Driver), PCA9685 (Servo Shield). Acting as a high-current switch to safely power motors via MCU logic signals.

Important Note (Hardware Limitations & Burn Hazards): Never power a DC motor or a high-torque servo directly from the 5V or 3.3V pins of an Arduino or Raspberry Pi. Motors draw massive current spikes when starting or stalling. Drawing this power directly from the microcontroller will instantly overheat its voltage regulator and permanently fry the board. Always use a dedicated motor driver powered by a separate battery pack. Additionally, be aware that classic L298N drivers have a ~2V "voltage drop" due to their BJT architecture. If you supply 6V to the driver, your motors will only receive 4V.

Frequently Asked Questions (FAQ)

Q: Why is my servo motor jittering or twitching uncontrollably?
A: Servo jitter is almost always caused by an insufficient power supply. When the servo moves, it draws a spike of current; if the battery cannot deliver it, the voltage drops, causing the microcontroller to briefly reset or send corrupted PWM signals. Ensure you are using a high-discharge battery pack (like 18650 Li-ion cells) and a proper buck converter if necessary, rather than standard AA alkaline batteries.

Q: What is the difference between a Servo and a Stepper motor?
A: A Servo is designed to rotate to a specific angle (e.g., exactly 90 degrees) and hold that position, making it perfect for a robot's elbow. A Stepper motor rotates continuously but in tiny, highly precise increments (steps), making it ideal for moving a 3D printer's print head exactly 0.1mm along a rail.