Micro Servo MG90D 180 deg High Torque Metal Gear

If you are looking for a DC motor with a controllable angle and has a smaller size, then this one best fits your requirement.

There are several kinds of servo motors. There's a continuous rotating servo, a 180° servo, a 270° servo, a plastic geared servo, and a metal-geared servo.

This servomotor MG90D is metal-geared, which gives us more torque as well as more gear strength. The size is the same with smaller sized servo like SG90. Most accessories that a mini servo has can fit. This servo needs voltage from 4.8V to 6V. 

The torque or the lifting power of this servo depends on the voltage that supplies the motor. It can lift from 2.1kg-cm to  2.4kg-cm with power supply from 4.8V to 6V. With a motor speed of 0.10 seconds per 60° and 0.08 seconds per 60°.

You might need an external power supply when powering up multiple servos at once since an MCU could only give a limited amount of current.

This motor is suitable for projects that need an angle-controlled motor like a swaying ultrasonic sensor to check its surroundings.

QUICK SPECS:

• Size : 22.8 x 12.2 x 28.5 mm
• Voltage: 4.8V to 6V DC
• Weight: 13.4 grams
• Speed : 0.1 sec/60degrees (at 4.8V), 0.08 sec/60 degrees (at 6.0V)
• Stall Torque : At 4.8V: 2.1 kg-cm / 25 oz-in. At 6.0V: 2.4 kg-cm / 30.5 oz-in
• Spline Count: 20