{"id":16616754,"url":"https://github.com/stecman/avr-doomclock","last_synced_at":"2025-10-27T10:10:23.974Z","repository":{"id":66224496,"uuid":"169127510","full_name":"stecman/avr-doomclock","owner":"stecman","description":"GPS clock on an ATTiny with MAX7219 7-segment driver","archived":false,"fork":false,"pushed_at":"2021-07-26T10:12:44.000Z","size":80,"stargazers_count":4,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-01-17T19:43:22.646Z","etag":null,"topics":["attiny13a","avr","avr-gcc","digital-clock","firmware","microcontroller"],"latest_commit_sha":null,"homepage":"https://hackaday.io/project/163826-gps-wall-clock","language":"C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/stecman.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2019-02-04T18:33:58.000Z","updated_at":"2023-04-19T12:51:55.000Z","dependencies_parsed_at":null,"dependency_job_id":"718d931c-86ee-4b1c-bdc7-55895dca6558","html_url":"https://github.com/stecman/avr-doomclock","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/stecman%2Favr-doomclock","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/stecman%2Favr-doomclock/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/stecman%2Favr-doomclock/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/stecman%2Favr-doomclock/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/stecman","download_url":"https://codeload.github.com/stecman/avr-doomclock/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":242967741,"owners_count":20214281,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["attiny13a","avr","avr-gcc","digital-clock","firmware","microcontroller"],"created_at":"2024-10-12T02:14:08.479Z","updated_at":"2025-10-27T10:10:18.952Z","avatar_url":"https://github.com/stecman.png","language":"C","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Tiny GPS Clock\n\nThis is a `hh:mm:ss` clock that runs from the time contained in NMEA RMC sentences.\nThe code is targeted at an Atmel ATTiny13A.\n\nNotes:\n\n- As the target microcontroller doesn't have enough RAM to store a full NMEA sentence,\nthis project uses a custom parser that only reads RMC (\"Recommended Minimum\") sentences from a UART\nand extracts the time from that (see`nmea.c`).\n\n- The ATTiny13A lacks SPI and UART peripherals, so these are implemented in software.\n\nSchematic and construction details can be found on [this project's hackaday.io page](https://hackaday.io/project/163826-gps-wall-clock).\n\n## Building and flashing\n\nThe `avr-gcc` toolchain is required to build, but there are no other external dependencies.\n\n```sh\n# Build\nmake\n\n# Flash with programmer configured in Makefile\nmake flash\n```\n\n## Testing\n\nThe simple test suite for NMEA RMC sentence decoding can be run manually with:\n\n```sh\nmake test\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fstecman%2Favr-doomclock","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fstecman%2Favr-doomclock","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fstecman%2Favr-doomclock/lists"}