{"action":"opened","issue":{"url":"https://api.github.com/repos/ReactivePlatform/Notes/issues/1","labels_url":"https://api.github.com/repos/ReactivePlatform/Notes/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/ReactivePlatform/Notes/issues/1/comments","events_url":"https://api.github.com/repos/ReactivePlatform/Notes/issues/1/events","html_url":"https://github.com/ReactivePlatform/Notes/issues/1","id":127035950,"number":1,"title":"[笔记]硬件:PWM模拟信号实现","user":{"login":"keyskull","id":3397225,"avatar_url":"https://avatars.githubusercontent.com/u/3397225?v=3","gravatar_id":"","url":"https://api.github.com/users/keyskull","html_url":"https://github.com/keyskull","followers_url":"https://api.github.com/users/keyskull/followers","following_url":"https://api.github.com/users/keyskull/following{/other_user}","gists_url":"https://api.github.com/users/keyskull/gists{/gist_id}","starred_url":"https://api.github.com/users/keyskull/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/keyskull/subscriptions","organizations_url":"https://api.github.com/users/keyskull/orgs","repos_url":"https://api.github.com/users/keyskull/repos","events_url":"https://api.github.com/users/keyskull/events{/privacy}","received_events_url":"https://api.github.com/users/keyskull/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-01-16T16:40:49Z","updated_at":"2016-01-16T16:40:49Z","closed_at":null,"body":"### 学习笔记的第一话,来个简单易明点的先:\r\n* PWM信号是一种用于硬件控制的通信信号.\r\n* PWM信号按周期里更改高低电平各自占用时间的差异来进行控制.\r\n- 一个周期的时间硬件是有说明文档的.\r\n    - 例如我最近做的四轴飞行器的XXD牌子的电子调速器简称电调(diǎo)的操作频率是`50Hz`,`1/50=0.02秒/次`即一个周期的时间为`20毫秒`即`20000微妙`. \r\n    - C的延时微妙的函数是`usleep(unsigned int);`\r\n    - PS:周期即是程序猿的一次loop.\r\n"}}