What does HackerNews think of Espruino?

Kaluma: A Tiny JavaScript Runtime for RP2040 (Raspberry Pi Pico) | Nov 2022

That reminds me of this (open smart watch with a js scripting engine): https://shop.espruino.com/banglejs2

Gadgetbridge is an Android application for your smart watch and other devices | Sep 2022

The Bangle.js 2 is an excellent watch.[1] As a former Pebble user, this is the first device that I consider an adequate replacement for my Pebble (which by now has a diminished battery life and corroded charging contacts).

Here is my impression of the Bangle.js 2:

- Battery: Lasts about 3 weeks on a charge, constantly connected to my phone, when the watch is used for notifications and alarms. This is a major advantage over Apple Watches and Android/Wear OS watches. I don't want to charge my watch every day.

- Display and buttons: The 1.3" 8-color transflective display is comparable to the Pebble Time series' 64-color transflective display. The display is always on, and the backlight activation is highly configurable. The Bangle.js 2 has a touchscreen and 1 button, while Pebble watches have no touchscreen and 3 buttons.

- Software: Runs on the completely free and open source Espruino JavaScript interpreter,[2] which was my main motivation for purchasing this device. There are currently 336 apps in the web-based Bangle.js app loader (app store), including utilites and clocks (watch faces), all of which are FOSS. The bootloader and firmware can be updated directly from the app loader. On Android, there is a distribution of Gadgetbridge (built from the same code base as Gadgetbridge) with internet access enabled that integrates the Bangle.js app loader into Gadgetbridge, which makes it very easy to use the watch.[3] I haven't built any apps for the watch yet, but Espruino has a web-based IDE.[4]

- Build: Built on the same device body as the SMA Q3.[5] The casing is plastic, and the watch is compatible with standard 20 mm watch straps. The IP67 water/dust resistance makes the watch usable for sports.

Overall, I highly recommend the Bangle.js 2 watch, which is the best FOSS-focused watch I have found to date. I hope this project catches on and continues to succeed.

[1] Bangle.js 2: https://banglejs.com/

[2] Espruino JavaScript interpreter: https://github.com/espruino/Espruino

[3] Bangle.js Gadgetbridge (distribution): https://www.espruino.com/Gadgetbridge

[4] Espruino Web IDE: https://www.espruino.com/ide/

[5] SMA Q3: https://www.smawatch.com/details?product_id=130

Running TypeScript on ESP8266/ESP32 Devices | Mar 2022

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This makes use of a JS interpreter made for embedded devices: Espruino

More details in the Espruino repo: https://github.com/espruino/Espruino

Kickstarter for funding Micropython port to ESP8266 | Jan 2016

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How does this compare to the follow?

https://github.com/espruino/Espruino

https://www.kickstarter.com/projects/gfw/espruino-javascript...

JerryScript – A JavaScript Engine for Internet of Things | Jul 2015

Isn't this basically the same as the Espruino [1]? Has anyone compared the two in terms of performance and handling?

[1]: https://github.com/espruino/Espruino

Duktape: an embeddable JavaScript engine | Dec 2014

It serves a different purpose, but speaking of tiny JavaScript interpreters there is also the one for the Espruino boards. Last time I checked it was said to be 95% compatible, but I don't now against which specification. Probably it's OK for most tiny applications anyway.

Source code at https://github.com/espruino/Espruino

Espruino boards at http://www.espruino.com/