Feetech FS5115M-FB 6V 15kg.cm 180° Metal Gear Servo with Feedback

The Feetech FS5115M-FB is a high-torque standard-size servo with a fourth (green) wire that outputs the voltage of its internal position potentiometer. Reading that wire with an ADC tells your controller where the output actually is, so it can confirm a move finished, detect a stalled or blocked joint, or run its own position loop. It suits robot arms, walking robots, heavy control surfaces and payload mechanisms that need position confirmation.

Key features

• 15.5 kg.cm stall and 5.2 kg.cm rated torque at 6V; 14 kg.cm stall at 4.8V
• Copper metal gear train (1:300, backlash 0.5° or less) on ball bearings
• 180° ±5° travel over 500-2500 µs PWM, neutral at 1500 µs, dead band of 4 µs or less
• Feedback swings from about 3.0V at 500 µs to 0.25V at 2500 µs, within the range of a 3.3V ADC
• Draws up to 2.7 A at stall, so give it a BEC with headroom

Specifications

• Operating voltage: 6V
• Stall torque: 15.5 kg.cm at 6V
• Rated torque: 5.2 kg.cm at 6V
• Speed: 0.2 s/60° at 6V (no load)
• Current at 6V: 280 mA no load, 900 mA rated, 2.7 A stall
• Travel: 180° ±5° (500-2500 µs), 200° mechanical limit
• Feedback output: 3.0V at 500 µs, 1.66V at 1500 µs, 0.25V at 2500 µs
• Gears: copper, 1:300 ratio
• Bearings: ball bearings
• Output spline: 25T, 5.9 mm (M3 x 6 horn screw)
• Lead length: 300 mm
• Dimensions: 40.1 x 20.1 x 38.9 mm
• Weight: 64.2 g
• Operating temperature: -10 to 60°C