# Seeed Studio Grove 16-Channel PWM Driver (PCA9685): board outline, M2 holes and servo headers

> What are the Seeed Grove 16-Channel PWM Driver (PCA9685) board dimensions and mounting-hole positions?

- Category: Electronic components › Modules, sensors & displays
- Kind: Modern device
- 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.
- Page: https://xemstudio.com/objects/seeed-grove-16-channel-pwm-driver-pca9685/ · JSON: https://xemstudio.com/api/geometry?object=seeed-grove-16-channel-pwm-driver-pca9685 · Plain text: https://xemstudio.com/objects/seeed-grove-16-channel-pwm-driver-pca9685/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 64.2 | 44.24 | 16.4 |

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- 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.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| mounting holes | 5 × Ø2.2 on the Grove 20 mm grid | M2 screws or Grove mounting pegs | designed | all |
| servo headers | 8 × (2 × 3) at 2.54 pitch | 3-pin servo plugs | socket | all |
| Grove connector | 4-pin 2.0 mm right-angle | Grove cable | socket | all |

## Sizes

| 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 |

## Where the files are

- Seeed Studio: [Grove - 16 Channel PWM Driver (PCA9685) wiki](https://wiki.seeedstudio.com/Grove-16-Channel_PWM_Driver-PCA9685/) — web — Publisher's page; dimensions are facts
- RS Components: [Seeed Studio Grove - 16-Channel PWM Driver for PCA9685](https://uk.rs-online.com/web/p/power-motor-robotics-development-tools/1887095) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/seeed-grove-16-channel-pwm-driver-pca9685/index.json

- seeed-grove-16-channel-pwm-driver-pca9685: [STEP](https://xemstudio.com/files/hardware/seeed-grove-16-channel-pwm-driver-pca9685/seeed-grove-16-channel-pwm-driver-pca9685.step) · [STL](https://xemstudio.com/files/hardware/seeed-grove-16-channel-pwm-driver-pca9685/seeed-grove-16-channel-pwm-driver-pca9685.stl) — Seeed Studio Grove 16-Channel PWM Driver (PCA9685): board outline, M2 holes and servo headers

## Questions

**How big is the Grove 16-Channel PWM Driver?**

PCB 60 × 40 × 1.6 mm (64.2 × 44.24 mm over the mounting ears); 16.4 mm tall at the screw terminal.

**Where are its mounting holes?**

Five Ø2.2 mm holes in the edge ears on Seeed's 20 mm Grove grid, at (0, +20), (±30, +10) and (±20, −20) mm from the board centre.

## Fits with

- [Adafruit PCA9685 16-channel PWM servo driver](https://xemstudio.com/objects/adafruit-pca9685-16-channel-pwm-servo-driver/)
- [TowerPro SG90 micro servo](https://xemstudio.com/objects/towerpro-sg90-micro-servo/)
- [2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle](https://xemstudio.com/objects/pin-headers-2.54mm/)
- [Pluggable terminal block headers: Phoenix MSTBA / MSTBVA 2,5 (5.0 / 5.08 mm), 2–6 positions](https://xemstudio.com/objects/pluggable-terminal-blocks/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)