Hacking a Casio F91W digital watch (Bluetooth and OLED display)
The F91 Kepler project aims to redesign the classic Casio F91W watch by incorporating modern technology. It features an OLED display and Bluetooth capabilities, while retaining the original case. The project is currently in an unfinished state, with plans for further improvements and community involvement.
- ▪The F91 Kepler is a complete redesign of the Casio F91W watch.
- ▪It includes an OLED display and a Bluetooth capable microcontroller.
- ▪The project is currently incomplete, with a focus on enhancing software and functionality.
Hacker News (Newest) files mainly under programming. We currently carry 5,306 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | GitHub |
| Canonical URL | https://github.com/PegorK/F91_Kepler |
| Publication time | Thu, 28 May 2026 21:44:16 +0000 |
| Retrieval time | 2026-05-28T21:59:38.382Z |
| Last seen | 2026-05-28T21:59:38.382Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | yfWrbRVRiWph |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
F91 Kepler 8/8/25 - This project hasn't been active for a while, but I have kept it around for anyone interested in it or wants to draw inspiration from it. I have moved it from its original repo since I use GitHub more these days. The F91 Kepler is complete redesign of the classic Casio F91W watch. This project completely replaces the original internals of the watch only keeping the original case and adding an OLED display and a bluetooth capable MCU. This repo contains all the firmware, hardware, and completely unfinished software (phone app) ;). As of 7/18/22 the current state of the project is: Bluetooth capable and supports several calls. Only operates through bluetooth diagnostic apps such as nRF Connect. Full screen notifications for calls/texts. Notifications bar.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.