InfiniTime — Open-Source Firmware for PineTime Smartwatch

Community-developed C++ firmware for the Pine64 PineTime smartwatch built on FreeRTOS. Features BLE notifications, step counting, heart rate monitoring, multiple watch faces, and OTA updates with 3,200+ GitHub stars.

Boards:nRF52832

Firmware:InfiniTimeFreeRTOS

Use Cases:wearablesFitness TrackingnotificationsHeart Rate Monitoring

InfiniTime

InfiniTime is the primary community firmware for the Pine64 PineTime smartwatch. Written in C++ on FreeRTOS, it transforms the $27 PineTime into a fully functional smartwatch with week-long battery life.

Features

BLE Notifications — receive phone notifications via Bluetooth
Step Counting — accelerometer-based pedometer
Heart Rate Monitoring — PPG heart rate sensor
Multiple Watch Faces — digital, analog, and community-designed faces
Music Control — control phone media playback
Navigation — turn-by-turn directions from phone
Timer & Stopwatch — utility apps
OTA Firmware Updates — update wirelessly via companion app
Always-on Display — optional AOD mode

Companion Apps

Gadgetbridge (Android) — full-featured open-source companion
InfiniLink (iOS) — iOS companion app
ITD (Linux) — command-line companion
Amazfish (SailfishOS)

Battery Life

Approximately 5–7 days on a single charge with typical use, thanks to the nRF52832's ultra-low-power design and efficient firmware.

Community

Over 3,200 GitHub stars and an active contributor community. Part of the broader Pine64 open-source ecosystem.