SG90 9g Micro Servo
by TowerPro clone
SKU: PSA-CMP-SG90
No reviews yetTypical India street price
₹70–₹150
Hobby servo for gates, arms, and PSA Lab pan/tilt.
Interface: PWM (50 Hz)
Orange PWM lead to the kit servo pin; power servos from a 5 V supply with common GND.
Signal → D5 (GPIO14)
Blockly: set_servo_angle, servo_write
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Concept
SG90 is a tiny hobby servo: motor + gearbox + potentiometer + closed-loop driver. You send an angle command; it holds that position — perfect for gates, claws, and pan/tilt.
A little theory
Control is a 50 Hz (20 ms) frame. Pulse width roughly 1.0–2.0 ms maps to about 0–180°. Inside, an error amplifier compares the pot (actual angle) to the pulse width and drives an H-bridge until they match. Stall current spikes; USB ports and MCU regulators cannot feed several servos. Pulse timing often uses MCU timers (Servo.h). In the classroom, treat SG90 9g Micro Servo as a beginner part using PWM (50 Hz). Typical India street price is about ₹70–₹150. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Brown/Black = GND, Red = 5 V (external PSU for >1 servo), Orange/Yellow = PWM from a timer pin. Servo myservo; myservo.attach(pin); myservo.write(angle). Sweep slowly in labs to reduce current spikes.
Classroom & project use
- Barrier gate
- Robot claw
- Ultrasonic pan/tilt
- PSA Lab servo demos
Buying in India
Precautions
- Do not stall against hard stops
- External 5 V + common GND for more than one servo
- Do not force the horn past end stops by hand while powered
Specifications
| Torque | ~1.8 kg·cm |
| Travel | ~180° |
| Mass | 9 g |
| Category | Motors & Servos |
| Difficulty | Beginner |
| Voltage | 4.8–6V |
| Interface | PWM (50 Hz) |
Pinout
Brown GND | Red 5V | Orange PWM
