SG90 9G Micro Servo Motor
Lightweight and Affordable Positional Servo for Arduino and RC Projects
The SG90 is an industry-standard, lightweight 9g micro servo motor known for its low cost and ease of use. It is a favorite for beginners and hobbyists in RC vehicles, small robotic arms, and Arduino projects due to its simple control via standard 50Hz PWM signals and its accessible price point.
Widely Used Standard - One of the most common and affordable servos available, perfect for learning and prototyping.
Lightweight & Compact Weighing only 9 grams, it's ideal for weightsensitive projects like small RC planes and walkers.
Operating voltage is 4.8V to 6V DC. The SG90 is designed for positional control (0-180°) and can hold its position against external force.
It is controlled via PWM signal with a 50Hz frequency (20ms period). A 1ms pulse is typically -90°, 1.5ms is 0°, and 2ms is +90°.
It uses a standard 3pin interface: Brown Ground (GND), Red Power (4.86V), Orange/Yellow = Signal (PWM).
For projects requiring continuous rotation (e.g., for wheels), a dedicated 360° continuous rotation variant is available, which modifies the internal feedback mechanism.
Technical Specifications
| Parameter | Value |
|---|
| Operating Voltage | 4.8V to 6.0V |
| Stall Torque (4.8V) | 1.2 to 1.8 kg/cm (varies by model) |
| Speed (4.8V) | 0.1 to 0.12 sec/60° |
| Rotation | 180° standard (360° continuous variants available) |
| Weight | 9g (motor only) |
= Key Features =
+Simple Control - Standard servo PWM protocol makes it easy to use with microcontrollers like Arduino, Raspberry Pi, and ESP32.
+Accessory Kit Included - Typically includes a set of 3 different servo horns (arms) and mounting screws for easy mechanical integration.
+Low Power Consumption - Can often be powered directly from a microcontroller's 5V pin, though an external supply is recommended for projects with multiple servos.
= Applications =
- Small RC vehicles (planes, cars, boats) for controlling rudders, ailerons, and steering.
- Light-duty robotic arms and grippers.
- STEM education projects for teaching PWM and mechanical control.
- Simple animatronics and kinetic art installations.
Great for Beginners - An ideal first servo for learning how to control motion.
CostEffective Widely available and very affordable, making it perfect for budget-conscious projects.
√ Compatible with Arduino's standard Servo library.
√ 180° standard and 360° continuous rotation variants available.
√ Very popular in educational kits and DIY robotics.
Troubleshooting
Motor not moving or jittering:
- Verify the 4.8V to 6V power supply is sufficient (avoid undervoltage).
- Ensure the brown wire is connected to GND and the red wire to power.
- Check that the PWM signal pin is correctly connected and uses a valid servo library.
Servo not responding to angle commands:
- Verify the PWM signal frequency is 50Hz (20ms period) and the pulse width is within 1-2ms range.
- Avoid exceeding the specified pulse width range as this can damage the servo.
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