{"action":"closed","issue":{"url":"https://api.github.com/repos/bigjosh/Airboat-PCB/issues/2","repository_url":"https://api.github.com/repos/bigjosh/Airboat-PCB","labels_url":"https://api.github.com/repos/bigjosh/Airboat-PCB/issues/2/labels{/name}","comments_url":"https://api.github.com/repos/bigjosh/Airboat-PCB/issues/2/comments","events_url":"https://api.github.com/repos/bigjosh/Airboat-PCB/issues/2/events","html_url":"https://github.com/bigjosh/Airboat-PCB/issues/2","id":160881975,"number":2,"title":"Motor PWM may be too slow","user":{"login":"bigjosh","id":5520281,"avatar_url":"https://avatars.githubusercontent.com/u/5520281?v=3","gravatar_id":"","url":"https://api.github.com/users/bigjosh","html_url":"https://github.com/bigjosh","followers_url":"https://api.github.com/users/bigjosh/followers","following_url":"https://api.github.com/users/bigjosh/following{/other_user}","gists_url":"https://api.github.com/users/bigjosh/gists{/gist_id}","starred_url":"https://api.github.com/users/bigjosh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bigjosh/subscriptions","organizations_url":"https://api.github.com/users/bigjosh/orgs","repos_url":"https://api.github.com/users/bigjosh/repos","events_url":"https://api.github.com/users/bigjosh/events{/privacy}","received_events_url":"https://api.github.com/users/bigjosh/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-06-17T12:56:34Z","updated_at":"2016-07-26T06:19:46Z","closed_at":"2016-07-26T06:19:46Z","body":"The ATTINY currently runs with clock/8 set, so the ultimate clock frequency is 1MHz. This is done to fall below the FCC Part 15 threshold. \r\n\r\nAt this clock, the motor PWM frequency comes out to 4KHz, which is audible. \r\n\r\nThis could be fixed by....\r\n\r\n1. Using the faster PLL clock for motor PWM. I don't think this would cause any FCC problems becuase the output signal is still well below the threshold, but should be checked.\r\n\r\n2. Using a lower `TOP`. This would increase frequency at the cost of reduced resolution. "}}
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