ClubSense

Know every club. Own every yard.

A phone app for the round, and a small sensor that lives in the butt of the grip. The sensor notices the hit and names the club. The phone places the shot on the hole and keeps the distances.

The app

The round runs on the phone. OpenStreetMap supplies the hole: fairway, green, bunkers, and yardages to the front, middle, and back. You aim, the app suggests a club from your own history, and a dispersion ellipse shows where that club actually finishes, not a generic circle. After the shot, you mark the landing. Carry, miss direction, score, and a hole replay stay with the round.

ClubSense home with last round at Pine Canyon and scoring form — Home. Last round, scoring form, and a start button.

Aim shot on hole 2 with yardages and a driver dispersion ring on the pin — On the hole. Aim line, green depths, and the club’s spread on the pin.

Bag setup listing driver, woods, and irons with pair sensor actions — The bag. Each club keeps an average and a one-time sensor pairing.

4 iron dispersion plot with a 90 percent ellipse left of the aim line — Per club. Average, longest, and the real miss pattern.

Hole replay of a par 5 with driver and 7 iron shots drawn on the map — Replay. The saved hole, shot by shot, back on the map.

The hardware

Each club gets a coin-cell board in the grip cap. It sleeps until the swing, detects impact with a 6-axis IMU, and sends a short Bluetooth advertisement. The phone matches that id to a club. It does not keep fourteen connections open during the round. GPS stays on the phone.

The course app is in preview builds. The grip firmware is the piece in bring-up on the bench.

Board: Seeed XIAO nRF52840 Sense Plus, sitting in the butt of the grip
Radio: nRF52840, advertisement bursts only
Motion: 6-axis IMU. Wake on the swing, tag the impact
Power: CR2032 coin cell. No pack to charge on every club
Phone: Expo and React Native
Maps: Leaflet over OpenStreetMap golf features, plus the phone’s GPS