Adafruit
Bangle.js v2 - Hackable Javascript Smart Watch
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Bangle.js 2 is an open, hackable smartwatch. With a sunlight-readable always-on screen, 4-week battery life, complete flexibility, and complete control o...
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Bangle.js 2 is an open, hackable smartwatch. With a sunlight-readable always-on screen, 4-week battery life, complete flexibility, and complete control of your data, Bangle.js 2 is a refreshing break from expensive smart watches.
You can install new apps from the web or develop your own using JavaScript. All you need is a Web Browser (Chrome, Edge, or Opera) and you can upload apps or write code to run on your watch wirelessly! Bangle.js is waterproof and comes with Bluetooth Low Energy, GPS, a heart rate monitor, accelerometer, magnetometer, pressure sensor, and more.
Bangle.js 2.0 specs:
- IP67 Waterproof (max 1 meter for 30 minutes)
- Nordic 64MHz nRF52840 ARM Cortex-M4 processor with Bluetooth LE
- 256kB RAM, 1MB on-chip flash, 8MB external flash
- 1.3 inch 176x176 always-on 3-bit color LCD display (LPM013M126) with backlight
- Full touchscreen (6H hardness glass)
- GPS/Glonass receiver
- Heart rate monitor
- 3 Axis Accelerometer
- 3 Axis Magnetometer
- Air Pressure/Temperature sensor
- Vibration motor
- 200mAh battery, 4 week standby time
- 36mm x 43mm x 12mm watch body, with standard 20mm watch straps
- Full SWD debug port on back of watch
Jargon buster
Plain-language definitions for the technical terms used above.
- ARM Cortex-M4
- A 32-bit processor core commonly used inside microcontrollers for running embedded programs. It matters because it gives the micro:bit enough processing power for sensors, Bluetooth, sound, and classroom coding projects.
- GLONASS
- Russia’s satellite navigation system. A receiver that can also use GLONASS has more satellites to choose from, which can improve positioning reliability when the sky view is partly blocked.
- GPS
- The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
- IP67
- An ingress protection rating meaning the enclosure is dust-tight and can survive temporary immersion in water under specified test conditions. This matters when choosing a sensor for outdoor, wet, or wash-down environments.
- LCD
- LCD stands for liquid crystal display, a screen technology that uses a backlight and liquid crystals to show images or text. It matters because LCD modules usually need a display driver and enough controller pins or a bus interface to send image data.
- magnetometer
- A sensor that measures magnetic fields, often used to work out compass direction. It matters because nearby magnets, motors, or metal objects can affect readings and may require calibration.
- nRF52840
- The nRF52840 is a Nordic Semiconductor microcontroller commonly used in maker boards, especially where Bluetooth Low Energy is needed. Seeing it listed tells you the USB host software may support boards based on this chip.
- RAM
- RAM is temporary memory used while a device is running, and its contents are lost when power is removed. A “Run in RAM” mode is useful for testing settings without permanently programming the module, but it may not support every feature.
- SWD
- Serial Wire Debug is a two-wire programming and debugging interface used with many microcontrollers. It matters if you need low-level access to program, recover or debug the processor board connected to this carrier.
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