{"id":1372,"date":"2018-08-09T16:18:11","date_gmt":"2018-08-09T15:18:11","guid":{"rendered":"https:\/\/ofalcao.pt\/blog\/?p=1372"},"modified":"2018-08-09T16:18:11","modified_gmt":"2018-08-09T15:18:11","slug":"qi-charger-more-details","status":"publish","type":"post","link":"https:\/\/ofalcao.pt\/blog\/2018\/qi-charger-more-details","title":{"rendered":"Qi charger – more details"},"content":{"rendered":"
This post is part 3 of 4 of \u00a0Wireless charger<\/a><\/div>

So I found a 2.4A USB charger<\/a>:<\/p>\n

Carregador Parede 2Hix 4*Usb (2*2.4A+2*1.0A) Preto<\/figcaption><\/figure>\n

Already tried a 3A model but it was a dual USB port and no info about each port limit, I suspect it is 1.5A for each.<\/p>\n

So I started charging my EV3 again, with ev3dev running. But removed the USB hub and the CRS 4.0 dongle, left just the Edimax wi-fi dongle. Also disconnected 2 large EV3 motors I had:<\/p>\n

162666<\/pre>\n
163 mA (43 mA less than previous attempts)<\/p>\n
Is started from last night “full” charge with same Qi emitter and receiver (but EV3 OFF), 7.23 Volt<\/p>\n
7232133<\/pre>\n
After 45 minutes it charged to 0.1 V more (7330466). After that it slowed down but still charge up to 7350466 exactly 1h57m after.<\/p>\n
Then it started to behave strangely again, discharging to 7262466 after another 35 minutes. Then it stayed there for the next 20 minutes.<\/p>\n
Both RED and GREEN lights are ON (EV3 battery). And the Qi devices seem\u00a0 coupled.<\/p>\n
7.26V is just 0.03V more than last night “full” charge result. Perhaps it is the best I can get with the boost circuit’s output trimmed to 9.02V.<\/p>\n
If that’s the limit, then using a better USB charger and\/or reducing EV3 current consumption by 43 mA helped. But it still isn’t enough for a mobile robot, adding a couple of motors and sensors will raise consumption above the nearby threshold and the robot will just discharge slower until it shuts down.<\/p>\n
I wish the EV3 had a Real Time Clock and wake up function. Crazy ideas accepted \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"
This post is part 3  of 4 of \u00a0Wireless charger<\/a><\/div>
So I found a 2.4A USB charger: Already tried a 3A model but it was a dual USB port and no info about each port limit, I suspect it is 1.5A for each. So I started charging my EV3 again, with ev3dev running. But removed the USB hub and the CRS 4.0 dongle, left just … Continuar a ler “Qi charger – more details”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[1],"tags":[],"series":[338],"class_list":["post-1372","post","type-post","status-publish","format-standard","hentry","category-sem-categoria","series-wireless-charger"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2Mhyv-m8","_links":{"self":[{"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/posts\/1372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/comments?post=1372"}],"version-history":[{"count":0,"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/posts\/1372\/revisions"}],"wp:attachment":[{"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/media?parent=1372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/categories?post=1372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/tags?post=1372"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/ofalcao.pt\/blog\/wp-json\/wp\/v2\/series?post=1372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}