Pinout
Servo motor connector (SG90, 3-pin PWM) pinout
Pins
- GND (usually brown or black)
- VCC (usually red — 4.8–6V typical)
- Signal (usually orange, white, or yellow — PWM pulse, ~1–2ms high every 20ms)
Specifications
| Operating voltage | 4.8–6 V |
|---|---|
| Stall torque | 1.8 kgf·cm at 4.8 V |
| Speed | 0.1 s / 60° at 4.8 V |
| Rotation | ≈180° |
| Control signal | PWM 50 Hz (20 ms period) |
| Pulse width | ≈1 ms (−90°) – 1.5 ms (centre) – 2 ms (+90°) |
| Dead band | 10 µs |
| Gears | Plastic (nylon) |
| Weight | 9 g |
| Size | 22.2 × 11.8 × 31 mm |
Notes
- Never power a servo from a microcontroller board’s own onboard 5V regulator. Even one small hobby servo can draw several hundred mA moving, and far more than that — easily 1A+ — when it stalls against a mechanical limit, well past what most boards’ regulators are rated for. Power VCC from a separate 5–6V supply sized for the servo(s), sharing only GND with the microcontroller.
- More than one or two servos makes this non-optional: a small servo’s stall current alone can exceed what an Uno’s onboard regulator survives, and that is before adding a second or third servo moving at the same time.
