{"id":26044380,"url":"https://github.com/pa2er/icom-ctcss","last_synced_at":"2026-04-21T14:31:36.610Z","repository":{"id":277850714,"uuid":"933231650","full_name":"PA2ER/Icom-CTCSS","owner":"PA2ER","description":"Arduino Nano replacement for Icom UT-34 CTCSS module","archived":false,"fork":false,"pushed_at":"2025-03-05T10:30:10.000Z","size":254,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-03-05T11:31:13.469Z","etag":null,"topics":["arduino","ctcss","icom","ut-34"],"latest_commit_sha":null,"homepage":"","language":"C++","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/PA2ER.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"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":"2025-02-15T13:25:02.000Z","updated_at":"2025-03-05T10:30:13.000Z","dependencies_parsed_at":"2025-02-23T21:24:27.023Z","dependency_job_id":null,"html_url":"https://github.com/PA2ER/Icom-CTCSS","commit_stats":null,"previous_names":["pa2er/icom-ctcss"],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/PA2ER%2FIcom-CTCSS","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/PA2ER%2FIcom-CTCSS/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/PA2ER%2FIcom-CTCSS/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/PA2ER%2FIcom-CTCSS/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/PA2ER","download_url":"https://codeload.github.com/PA2ER/Icom-CTCSS/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":242437707,"owners_count":20128090,"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":["arduino","ctcss","icom","ut-34"],"created_at":"2025-03-07T18:19:14.787Z","updated_at":"2026-04-21T14:31:36.603Z","avatar_url":"https://github.com/PA2ER.png","language":"C++","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Arduino CTCSS (de)coder for Icom IC-275\n\n## Description:\nWith this code, I try to attempted to program a Arduino nano, to use in older transceivers, where the CTCCC board is no longer available.\u003cbr\u003e\nThe goal is to let the Arduino communicate with the transceiver, as it would with a factory CTCSS board.\u003cbr\u003e\nI found out that Icom, yaesu, and Kenwood, all use a 8 bit shift register IC, and a CTCSS encoder/decoder IC like the FX365, that are obsolete.\u003c/p\u003e\n## acknowledgment\nI used the library written by PE1CID,that I slightly modified, to generate the sub-audio tone. (CtcssTone)\u003c/p\u003e\n## Pins used:\u003cbr\u003e\nPIN 2 = ChipSelect Input for TSTB (P47-3) from the transceiver\u003cbr\u003e\nPIN 3 = PWM_OUTPUT output that generates the sub-audio tone, via filter network to TSTN (P46-5) to the transceiver\u003cbr\u003e\nPIN 4 = PTT_INDICATOR output indicator with led -for testing purposes\u003cbr\u003e\nPIN 5 = TONE_OFF_INDICATOR output indicator with led for testing purposes\u003cbr\u003e\nPIN 8 = DECODE_INDICATOR goes high if CTCSS code is decoded\u003cbr\u003e\nPIN 11 = MOSI SPI DATA (P47-4) from transceiver\u003cbr\u003e\nPIN 13 = SCK SPI clock serial clock for CK (P47-5) from transceiver\u003cbr\u003e\nPIN 14 = A0 Sub-audio tone input, needs 260Hz lowpass filter\u003cp\u003e\n## Transceiver conections:\nP47-1 = 5V\u003cbr\u003e\nP47-2 = GND\u003cbr\u003e\nP47-3 = TSTB (Chip Select) to D2\u003cbr\u003e\nP47-4 = DATA (MOSI) to D11\u003cbr\u003e\nP47-5 = CK (SCK) to D13\u003cp\u003e\n\nP46-1 = TSFL Squelch control\u003cbr\u003e\nP46-2 = AFMT AF mute\u003cbr\u003e\nP46-3 = TSAO Receive OUTPUT\u003cbr\u003e\nP46-4 = GND\u003cbr\u003e\nP46-5 = TSTN Transmit Input to D3 via filter network\u003cbr\u003e\nP46-6 = GND\u003cp\u003e\n## Serial data from transceiver\nChannel 1 = Yellow = Data\u003cbr\u003e\nChannel 2 = Purple = Clock\u003cbr\u003e\nChannel 3 = Blue = ChipSelect (CS)\u003cp\u003e\nClock period (Fig1) = 4.4 uSec\u003cbr\u003e\nData Pulse (Fig2) = 2.2 uSec.\u003cbr\u003e\nLatch after last clock pulse (Fig3) = 14.8 uSec.\u003cbr\u003e\nLatch time (Fig4) = 3.8 µSec.\u003cbr\u003e\nLatch to next bust of always 192 (Fig5) = 22.2 uSec.\u003cp\u003e\n### Clock period (Fig1) = 4.4 uSec\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_Clock_period1.png\" alt=\"Fig1\"\u003e\u003cp\u003e\n\n### Data Pulse (Fig2) = 2.2 uSec.\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_Data_pulse.png\" alt=\"Fig2\"\u003e\u003cp\u003e\n\n### Latch after last clock pulse (Fig3) = 14.8 uSec.\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_Latch_after_last_clock.png\" alt=\"Fig3\"\u003e\u003cp\u003e\n\n### Latch time (Fig4) = 3.8 µSec.\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_latch_time.png\" alt=\"Fig4\"\u003e\u003cp\u003e\n\n### Latch to next bust of always 192 (Fig5) = 22.2 uSec.\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_latch_to_next_burst.png\" alt=\"Fig5\"\u003e\u003cp\u003e\n## Basic Schema\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_Schema.png\" alt=\"Basic Schema\"\u003e\u003cp\u003e\n## UT34-Board\u003cbr\u003e\n\u003cimg src=\"pics/CTCSS_Board.png\" alt=\"Basic Board\"\u003e\u003cp\u003e\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpa2er%2Ficom-ctcss","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpa2er%2Ficom-ctcss","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpa2er%2Ficom-ctcss/lists"}