{"id":2596,"date":"2015-08-12T22:12:44","date_gmt":"2015-08-12T22:12:44","guid":{"rendered":"http:\/\/41j.com\/blog\/?p=2596"},"modified":"2015-08-13T09:59:21","modified_gmt":"2015-08-13T09:59:21","slug":"picomotor-driver-scope-traces","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2015\/08\/picomotor-driver-scope-traces\/","title":{"rendered":"Picomotor driver scope traces"},"content":{"rendered":"<p>I previously posted about getting the <a href=\"http:\/\/41j.com\/blog\/2015\/06\/playing-with-picomotors\/\">picomotor up and running<\/a>. Picomotors are awesome little motors which provide 30 to 100 nanometer resolution without gearing. Anyway, I cleverly almost blew it up the driver other day,\u00a0 by sticking 15 volts into the 5v line. A repair would be tractable, as it&#8217;s all discrete 1980s logic, however luckily all I need to do is change one of its many fuses.<\/p>\n<p>Anyway, I really don&#8217;t ever want to by another driver, as it was too expensive for a bunch of 74 series logic and some big inductors. So I figured I&#8217;d grab some waveforms just in case I ever decide to build one. The waveforms however are somewhat confusing&#8230; my understanding is that when moving in one direction I should see a sort pulse, followed by a long pulse. In the other direction a long followed by a short. That&#8217;s not really what I saw. The baseline appeared to shift between forward and reverse motion. And it didn&#8217;t look like the pulses changed order&#8230; I may revisit this in the future and grab some more traces. But the useful information is that the driver uses 150v to drive the stack, short pulse width is ~20us, long ~100us. Maybe&#8230;<\/p>\n<p>[UPDATE: I think my non-sleep deprived brain understands these traces a little better basically we&#8217;re interested in the rise and fall time, not the durations of the traces. So I think these traces make sense, in the first set we have a fast rise time and a slow fall, the second fast fall, slow rise. The fact that the baseline I don&#8217;t think matters too much, though there&#8217;s probably a reason for this that I don&#8217;t yet fully understand]<\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064932.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2600\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064932.png\" alt=\"150813_064932\" width=\"640\" height=\"480\" \/><\/a><\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064952.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2601\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064952.png\" alt=\"150813_064952\" width=\"640\" height=\"480\" \/><\/a><\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064920.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2599\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064920.png\" alt=\"150813_064920\" width=\"640\" height=\"480\" \/><\/a><\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064508.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2598\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064508.png\" alt=\"150813_064508\" width=\"640\" height=\"480\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064427.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2597\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_064427.png\" alt=\"150813_064427\" width=\"640\" height=\"480\" \/><\/a><br \/>\n<a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_065038.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2602\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_065038.png\" alt=\"150813_065038\" width=\"640\" height=\"480\" \/><\/a><a href=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_065047.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2603\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2015\/08\/150813_065047.png\" alt=\"150813_065047\" width=\"640\" height=\"480\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I previously posted about getting the picomotor up and running. Picomotors are awesome little motors which provide 30 to 100 nanometer resolution without gearing. Anyway, I cleverly almost blew it up the driver other day,\u00a0 by sticking 15 volts into the 5v line. A repair would be tractable, as it&#8217;s all discrete 1980s logic, however [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_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","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-2596","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-FS","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2596","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=2596"}],"version-history":[{"count":4,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2596\/revisions"}],"predecessor-version":[{"id":2610,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2596\/revisions\/2610"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=2596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=2596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=2596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}