Feetech FS90-FB 6V 1.5kg.cm 180° Micro Servo with Feedback

The Feetech FS90-FB is a micro servo with a fourth (green) wire that outputs the voltage of its internal position potentiometer. Read on any ADC pin, it tells a microcontroller where the output shaft really is, so a project can confirm a move completed, spot a blocked linkage or close its own position loop. It suits small robot arms, grippers, animatronics and projects that teach closed-loop control.

Key features

• 1.5 kg.cm stall torque at 6V, 1.3 kg.cm at 4.8V
• Feedback rises from about 0.07V at 500 µs through 1.62V at 1500 µs to 3.17V at 2500 µs, inside a 3.3V ADC range
• 180° ±5° travel over 500-2500 µs, neutral at 1500 µs, dead band of 8 µs or less
• POM gear train (1:263) in a PC plastic case
• Standard 3-wire servo signal, power and ground, plus the separate feedback wire

Specifications

• Operating voltage: 6V
• Stall torque: 1.5 kg.cm at 6V
• Rated torque: 0.5 kg.cm at 6V (250 mA)
• Travel: 180° ±5° (500-2500 µs), neutral 1500 µs
• Feedback output: 0.07V at 500 µs, 1.62V at 1500 µs, 3.17V at 2500 µs
• Gears: POM, 1:263 ratio, no ball bearing
• Case: PC plastic
• Lead length: 250 mm
• Dimensions: 22.5 x 12.1 x 26.7 mm
• Weight: 10.2 g
• Operating temperature: -10 to 60°C