Projects / Servo Expression Face
Servo Expression Face
Build a laser-cut 3mm birch face with 3× SG90 micro servos driving brows and jaw via simple linkages (2 eye servos are an advanced option: eye brackets not supplied). Program expression presets using PWM. Keep it on a desk as a robotics-club piece.
Digital guide + cut files + BOM + code · Parts sourced separately · Ages 8–14 with adult help
Pack contents
- Face plate + linkage blank SVGs
- Build guide: cut, link, wire, calibrate
- First-principles: PWM, linkages, coordinated DOF
- Expression preset firmware
- Verified BOM (~$38–111 hardware)
Typical hardware cost
Default structure is laser-cut birch plywood with real fasteners and hobby electronics you can source—honest BOM, not mystery modules.
- ~$38–111 in typical parts (makerspace cut toward the low end; mail-order toward the high end)
- Digital pack price ≠ hardware
The $12 pack is the digital guide + cut files + BOM + lessons + code, plus printable Builder's Corner build journal pages. Hardware is sourced separately — see Where to get kit materials. Buy with Stripe is live below.
Questions? Email us at lance.haney@gmail.com.
Pricing
- Home / Personal license $12
- Classroom license $45 — 1 teacher, up to 30 studentsOne $45 Classroom license covers one group of up to 30 students. Each additional group needs another license.
- Build materials available at cost + 10% — email for a quote
Learning outcomes
- Map servo angles to facial feature poses
- Build light birch linkages without binding
- Sequence multi-servo expressions
- Power multiple SG90s safely on an external 5 V rail