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Servo options depend mainly on whether you need position control (typically ~180°/270°/300°) or continuous rotation (360° wheel-style motion), plus the torque you need.

Micro servos (small robots, pan/tilt, light mechanisms)

• Budget ~180°: 9g micro servo (1.6kg) (1.6 kg·cm) $7.07
• More durable gears: 9g Metal Gear Micro Servo (1.8Kg ) (metal gears, 1.8 kg·cm) $10.01
• Ultra-small continuous rotation: 2.5g 360 degree Micro Servo (0.45kg) (360°, 0.45 kg·cm) $14.05
• High-torque micro option: Micro Servo - MG90S High Torque Metal Gear (metal gear, compact) $20.98

Standard/high-torque servos (arms, heavier linkages)

• Standard size ~180°: DSS-P05 Standard Servo (5kg) (~5 kg-class) $19.40
• Heavy duty: DF Metal Geared 15Kg Standard Servo 180° (DSS-M15) (15 kg·cm, 180°) $24.68
• Wider travel: DF Metal Geared 15Kg Standard Servo 270° (DSS-M15S) (15 kg·cm, 270°) $25.66
• “Slip/clutch” protection for mechanisms that can be forced: DFRobot SER0057 6kg 300° Clutch Servo (300°, clutch) $21.48
• MG996R-style metal gear: Metal Gear Servo 180 Degrees (MG996R, ~10 kg class) $15.27

Continuous rotation servos (drive wheels, winches, rotation instead of positioning)

• Micro continuous: Micro Servo 9g - Continuous (360° continuous) $7.95
• Micro continuous (FS90R): Continuous Rotation Micro Servo [FS90R] (360° continuous) $14.63
• Standard-size continuous rotation: Servo - Generic High Torque Continuous Rotation (Standard Size) (high torque, continuous) $41.97
• Continuous rotation + feedback sensing: Feedback 360 Degree - High Speed Continuous Rotation Servo (360° + position feedback) $65.97

Servo driver / control boards (run many servos cleanly)

• PCA9685 16-channel I2C driver (great for Arduino/Pi): Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface [PCA9685] (16-ch, 12-bit, I2C) $31.47
• Raspberry Pi form-factor: Adafruit 16-Channel PWM / Servo Bonnet for Raspberry Pi (16-ch, PCA9685) $26.83 and Adafruit 16-Channel PWM / Servo HAT for Raspberry Pi - Mini Kit $34.14
• Raspberry Pi Pico: Servo Driver Module for Raspberry Pi Pico, 16-ch Outputs, 16-bit Resolution (16-ch, 16-bit) $16.84
• No-program trigger control: SparkFun Servo Trigger $43.09 or SparkFun Servo Trigger - Continuous Rotation $34.37

Pan/tilt brackets & kits (camera/sensor mounts)

• With servos included: Mini Pan-Tilt Kit - Assembled with Micro Servos $40.36
• Bracket only: Unassembled Mini Pan-Tilt Kit (Without Micro Servos) $9.65 or FPV Nylon Pan Tilt Kit (Without Servo) $5.85
• Raspberry Pi pan/tilt control: Pan-Tilt HAT - Full kit $66.90 or Pan-Tilt HAT - without Pan-Tilt module $29.84

Useful accessories (mounting, horns, extensions)

• Horns: Micro Servo Arm and Horn Set $2.43, Standard Servo Arm and Horn Set - 25 Spline $4.87, Metal Servo Horn $5.36, Plastic Servo Horn $3.24
• Brackets: Aluminum Multi-Purpose Servo Bracket $9.31, Mounting Bracket for Standard-Size Servos $6.73, Metal Servo Bracket $3.55
• Extensions/Y-cables: Servo extension cable 150mm $0.92, Servo extension cable 300mm $1.09, Servo extension cable 600mm (23.62) $1.58, Servo Y extension cable (300mm) $1.66