Seeed Studio Grove 16-Channel PWM Driver (PCA9685): board outline, M2 holes and servo headers — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/seeed-grove-16-channel-pwm-driver-pca9685/  (sheet CC BY 4.0)
Basis: Seeed Studio Eagle board file for the Grove 16-Channel PWM Driver (PCA9685) v1.0, linked from the Seeed wiki: outline, drills, part positions and footprints.
Catalog version: 2026-10-20

Overall (mm): length 64.2, width 44.24, height 16.4
- Datum: board centre, component side up, board bottom at 0. PCB 60 × 40 × 1.6, corners R0.8, on Seeed's Grove 20 mm grid.
- Grove edge: five round ears Ø4.2 on the edge line, each with a Ø2.2 hole (table), and five Ø4.2 notches at (−20, +20), (+20, +20), (0, −20), (−30, −10), (+30, −10). The ears take the outline to 64.2 × 44.24.
- Above the board: Grove 4-pin 2.0 mm right-angle connector on the −x edge, 6.0 tall, opening toward −x; eight 2 × 3 2.54 mm servo headers (16 channels) in 4 columns × 2 rows at x ±10.29 and ±20.32, y ±13.97, 8.5 tall; 2-pin 5.0 mm servo-power screw terminal at the +x edge, 14.8 tall; two Ø6.3 electrolytic capacitors 5.4 tall.
- Component heights come from the footprint package names (not in the board file). Not modelled: the PCA9685 chip, SMD passives, test pads and solder jumpers.
- Dimensions are exact nominal (true size), no tolerance added.

hole  x (mm)  y (mm)  Ø (mm)
1  −0.02  +20.02  2.2
2  −30.01  +10.02  2.2
3  +29.99  +9.98  2.2
4  +19.98  −20.01  2.2
5  −19.98  −20.02  2.2

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Seeed Studio: Grove - 16 Channel PWM Driver (PCA9685) wiki — web — Publisher's page; dimensions are facts — https://wiki.seeedstudio.com/Grove-16-Channel_PWM_Driver-PCA9685/
- RS Components: Seeed Studio Grove - 16-Channel PWM Driver for PCA9685 — web — Publisher's page; dimensions are facts — https://uk.rs-online.com/web/p/power-motor-robotics-development-tools/1887095

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/seeed-grove-16-channel-pwm-driver-pca9685/index.json
API: https://xemstudio.com/api/geometry?object=seeed-grove-16-channel-pwm-driver-pca9685