SG90 Micro Servo

180 degree micro servo motor. PWM controlled. 4.8V-6V operating voltage. Used for small positional control tasks.

Actuator Tower Pro SG90 servo pwm Draft

This entry is draft and has not been confirmed against physical hardware. A conforming tool will refuse to provision it. The datasheet is the authority, not this page.

Specifications

Protocol pwm
Manufacturer Tower Pro
Model number SG90
Actuator type servo
Command topic suffix command/position
Response topic suffix response/position

Commands

CommandArgumentRangeDescription
SET_ANGLE angle 0 to 180 ° Set servo position to a specific angle 0-180 degrees. Payload: integer angle value
CENTER none - Move servo to center position (90 degrees)
MIN none - Move servo to minimum position (0 degrees)
MAX none - Move servo to maximum position (180 degrees)

Wiring

PinRequiredNotes
signal Yes 50Hz control pulse.

Supply: 5V

Failure modes

  • Pulse width limits vary between units and clones. Commanding the full nominal range drives many units into their end stops, where they stall and draw heavily.
  • A stalled servo draws several hundred milliamps and will brown out a Raspberry Pi sharing the 5V rail. Use a separate supply with grounds tied.
  • There is no position feedback. The commanded angle is not confirmation that the horn reached it.
  • Software PWM jitter makes the horn buzz and hunt around the setpoint.

Entry

Keysg90
StatusDraft
Revision1
Registry0.3.0
Entry on GitHub JSON for agents

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