{"action":"created","issue":{"url":"https://api.github.com/repos/PX4/Hardware/issues/55","repository_url":"https://api.github.com/repos/PX4/Hardware","labels_url":"https://api.github.com/repos/PX4/Hardware/issues/55/labels{/name}","comments_url":"https://api.github.com/repos/PX4/Hardware/issues/55/comments","events_url":"https://api.github.com/repos/PX4/Hardware/issues/55/events","html_url":"https://github.com/PX4/Hardware/issues/55","id":128773749,"number":55,"title":"PX4 Airspeed sensor: Missing level shifter","user":{"login":"LorenzMeier","id":1208119,"avatar_url":"https://avatars.githubusercontent.com/u/1208119?v=3","gravatar_id":"","url":"https://api.github.com/users/LorenzMeier","html_url":"https://github.com/LorenzMeier","followers_url":"https://api.github.com/users/LorenzMeier/followers","following_url":"https://api.github.com/users/LorenzMeier/following{/other_user}","gists_url":"https://api.github.com/users/LorenzMeier/gists{/gist_id}","starred_url":"https://api.github.com/users/LorenzMeier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/LorenzMeier/subscriptions","organizations_url":"https://api.github.com/users/LorenzMeier/orgs","repos_url":"https://api.github.com/users/LorenzMeier/repos","events_url":"https://api.github.com/users/LorenzMeier/events{/privacy}","received_events_url":"https://api.github.com/users/LorenzMeier/received_events","type":"User","site_admin":false},"labels":[{"id":10885072,"url":"https://api.github.com/repos/PX4/Hardware/labels/bug","name":"bug","color":"fc2929","default":true}],"state":"open","locked":false,"assignee":{"login":"LorenzMeier","id":1208119,"avatar_url":"https://avatars.githubusercontent.com/u/1208119?v=3","gravatar_id":"","url":"https://api.github.com/users/LorenzMeier","html_url":"https://github.com/LorenzMeier","followers_url":"https://api.github.com/users/LorenzMeier/followers","following_url":"https://api.github.com/users/LorenzMeier/following{/other_user}","gists_url":"https://api.github.com/users/LorenzMeier/gists{/gist_id}","starred_url":"https://api.github.com/users/LorenzMeier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/LorenzMeier/subscriptions","organizations_url":"https://api.github.com/users/LorenzMeier/orgs","repos_url":"https://api.github.com/users/LorenzMeier/repos","events_url":"https://api.github.com/users/LorenzMeier/events{/privacy}","received_events_url":"https://api.github.com/users/LorenzMeier/received_events","type":"User","site_admin":false},"assignees":[{"login":"LorenzMeier","id":1208119,"avatar_url":"https://avatars.githubusercontent.com/u/1208119?v=3","gravatar_id":"","url":"https://api.github.com/users/LorenzMeier","html_url":"https://github.com/LorenzMeier","followers_url":"https://api.github.com/users/LorenzMeier/followers","following_url":"https://api.github.com/users/LorenzMeier/following{/other_user}","gists_url":"https://api.github.com/users/LorenzMeier/gists{/gist_id}","starred_url":"https://api.github.com/users/LorenzMeier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/LorenzMeier/subscriptions","organizations_url":"https://api.github.com/users/LorenzMeier/orgs","repos_url":"https://api.github.com/users/LorenzMeier/repos","events_url":"https://api.github.com/users/LorenzMeier/events{/privacy}","received_events_url":"https://api.github.com/users/LorenzMeier/received_events","type":"User","site_admin":false}],"milestone":null,"comments":10,"created_at":"2016-01-26T09:43:44Z","updated_at":"2016-11-16T21:01:08Z","closed_at":null,"body":"The PX4 airspeed sensor breakout is using a 5V sensor for a 3.3V bus, which is _not_ compliant with the I2C spec and leads to _thousands_ of read errors in a short time frame. It can be fixed in two ways:\n- Use a 3.3V model of the sensor and a small ultra-low-noise LDO in front of it. This would be the best solution.\n- Use a PCAxxxx I2C level shifter to shift the 3.3V signal from Pixhawk / Pixracer to 5V on the sensor side. Will likely require pull-ups on the airspeed sensor side.\n\nScope shots and further discussion here:\nhttps://github.com/PX4/Firmware/issues/3544#issuecomment-174732106\n"},"comment":{"url":"https://api.github.com/repos/PX4/Hardware/issues/comments/261070315","html_url":"https://github.com/PX4/Hardware/issues/55#issuecomment-261070315","issue_url":"https://api.github.com/repos/PX4/Hardware/issues/55","id":261070315,"user":{"login":"athertop","id":11801237,"avatar_url":"https://avatars.githubusercontent.com/u/11801237?v=3","gravatar_id":"","url":"https://api.github.com/users/athertop","html_url":"https://github.com/athertop","followers_url":"https://api.github.com/users/athertop/followers","following_url":"https://api.github.com/users/athertop/following{/other_user}","gists_url":"https://api.github.com/users/athertop/gists{/gist_id}","starred_url":"https://api.github.com/users/athertop/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/athertop/subscriptions","organizations_url":"https://api.github.com/users/athertop/orgs","repos_url":"https://api.github.com/users/athertop/repos","events_url":"https://api.github.com/users/athertop/events{/privacy}","received_events_url":"https://api.github.com/users/athertop/received_events","type":"User","site_admin":false},"created_at":"2016-11-16T21:01:08Z","updated_at":"2016-11-16T21:01:08Z","body":"So there exists a list of supported sensors? As regards connections, the sensor does work, but after powering the craft (indoors) it sits at about 7km/h, and even if I do the pre-flight reset option it still goes to about 7km/h initially then slowly rises to upto 20km/h - in no wind (indoors). I have ordered a new sensor from auav to see if this will resolve, and have raised a case with HK."}}
{"actor":{"display_login":"athertop"}}