Micro Servo 9g — FS90 with Position Feedback

A FEETECH FS90 micro servo with a fourth feedback wire — the camera tilt actuator used on the Crawler One. Same 9 g, 23 × 12 × 22 mm body as a classic SG90 so it drops into any standard micro-servo mount, but the green feedback wire gives you a live analogue read-out of the horn position. That means the Pi can know where the camera is pointing without needing an external encoder or extra timing logic.

Ships with the servo, four nylon horns (cross, star, single-arm and double-arm), two horn screws, and a 200 mm Dupont-terminated lead.

Product parameters

Features

• •Position-feedback wire — read the analogue voltage on the green pin to know the exact horn angle in real time.
• •Drop-in pin-compatible with any SG90 / FS90 mount.
• •Light enough for the Crawler One camera tilt without loading the chassis.
• •Ships with a full horn set + screws.
• •Crawler One usage
• •On the Crawler One, this servo handles the camera tilt. The signal wire connects to the Pi (PWM), VCC + GND join the 5 V power chain after the buck converter, and the feedback wire goes back to a Pi ADC pin (via an MCP3008 or similar) so the BYR app can show the current tilt angle.