Pine64 PineTime
Open-source smartwatch built on the Nordic nRF52832 SoC with 1.3-inch IPS touchscreen, heart rate sensor, accelerometer, and week-long battery life. Runs InfiniTime, Wasp-OS, or Zephyr firmware. Priced from $27.
$26.99
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Specifications
Certifications
Components
ARM Cortex-M4F @ 64MHz with 64KB RAM, 512KB flash, BLE 5.0, AES-128 hardware crypto, NFC-A tag support, and 1.2µA deep sleep
Sitronix display controller driving 1.3-inch 240×240 IPS panel with 65K colors via 4-wire SPI interface, readable in direct sunlight
Hynitron single-point capacitive touch controller with gesture recognition, I2C interface at up to 400kHz
Bosch low-power 3-axis accelerometer with built-in step counting, activity recognition, and orientation detection via I2C
TianYiHeXin optical heart rate sensor using photoplethysmography (PPG) with I2C interface and low active current (~0.1mA)
32Mbit SPI NOR flash memory for firmware storage, OTA updates, and resource files, operating at up to 108MHz
SGMicro linear lithium battery charger IC for the internal 180mAh LiPo cell, charged via 2-pin magnetic dock
Bus Interfaces
GPIO Map
Overview
The PineTime is a free and open-source smartwatch from Pine64, designed as a hackable, community-driven wearable. At just $27, it's the most affordable fully open-source smartwatch available, with OSHWA-certified open hardware, published schematics, and a thriving firmware ecosystem.
Built around the Nordic nRF52832 BLE SoC, the PineTime features a 1.3-inch sunlight-readable IPS touchscreen, Bosch BMA425 accelerometer for step counting, HRS3300 PPG heart rate sensor, and a 180 mAh battery delivering approximately one week of use per charge. The sealed IP67 variant is suitable for daily wear.
The primary firmware is InfiniTime (3,200+ GitHub stars), written in C++ on FreeRTOS with LVGL graphics, providing watch faces, BLE notifications, step counting, heart rate monitoring, music control, and OTA updates. Alternative firmware options include Wasp-OS (MicroPython), Zephyr RTOS, RIOT OS, and bare-metal Rust implementations. Companion apps are available for Android (Gadgetbridge), iOS (InfiniLink), Linux (Siglo, ITD), and SailfishOS (Amazfish).
Use Cases
6Resources
Where to Buy
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