{"id":4051,"date":"2019-02-12T01:03:36","date_gmt":"2019-02-12T09:03:36","guid":{"rendered":""},"modified":"2025-07-22T07:46:29","modified_gmt":"2025-07-22T14:46:29","slug":"4051","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/4051","title":{"rendered":"Go Direct Rotary Motion Troubleshooting and FAQs"},"content":{"rendered":"<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.34%\">\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/www.vernier.com\/product\/go-direct-rotary-motion-sensor\/\">Go Direct<sup>\u00ae<\/sup> Rotary Motion Sensor<\/a><\/h3>\n<p><strong>GDX-RMS<\/strong>\u2014Sensor only<br \/><strong>GDX-RMPK<\/strong>\u2014Sensor + Accessory Kit<\/p>\n<p><a href=\"\/manuals\/GDX-RMS\">Specifications and User Guide<\/a><\/p>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.34%\">\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.vernier.com\/wp-content\/uploads\/2019\/11\/product.gdx-rms._hero.001-600x338.jpg\" alt=\"\"\/><figcaption class=\"wp-element-caption\"><small><strong>Go Direct Rotary Motion<\/strong><\/small><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.vernier.com\/wp-content\/uploads\/2019\/11\/product.ak-rmv._hero.001-1-scaled.jpg\" alt=\"\"\/><figcaption class=\"wp-element-caption\"><small><strong>Rotational Motion Accessory Kit<\/strong><\/small><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Troubleshooting<\/h3>\n<p><strong>General: <\/strong>Press the power button on the sensor to turn it on. Connect your sensor as described in the <a href=\"https:\/\/www.vernier.com\/til\/get-started\/go-direct\">Getting Started instructions for your device<\/a>.<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Primary Test:<\/strong> Rotate the axle to verify that the sensor readout changes as expected (i.e., one full revolution is approximately \u00b16.28 radians).<\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Additional Troubleshooting<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/til\/4057\/\">Will my Go Direct Rotary Motion sensor fit into the Polarizer\/Analyzer equipment?<\/a><\/li>\n<li><a href=\"\/til\/717\/\">What is the highest rate of rotation for the Rotary Motion Sensor (standard and Go Direct)?<\/a><\/li>\n<li><a href=\"\/til\/1012\/\">What are the dimensions of the 3-step pulley\/wheel on the Rotary Motion Sensor?<\/a><\/li>\n<li><a href=\"\/til\/1823\/\">With which rotary motion sensors does the Vernier Rotational Motion Accessory Kit (AK-RMV) work?<\/a><\/li>\n<li><a href=\"\/til\/2732\/\">What are the moments of inertia of the disks included in the Rotary Motion Accessory Kit?<\/a><\/li>\n<li><a href=\"\/til\/4069\/\">How do I measure linear position with a GDX-RMS in Graphical Analysis or Graphical Analysis Pro?<\/a><\/li>\n<li><a href=\"\/til\/4179\/\">I can't get my accessories to attach to the Go Direct Rotary Motion Sensor.<\/a><\/li>\n<li><a href=\"\/til\/18486\/\">What are some experiment ideas I can do with a Rotary Motion sensor?<\/a><\/li>\n<li><a href=\"\/til\/15786\/\">Go Direct sensor does not connect to LabQuest 2 via Bluetooth.<\/a><\/li>\n<li><a href=\"\/til\/4014\/\">How do I remove or replace a Go Direct battery?<\/a><\/li>\n<li><a href=\"\/til\/6827\/\">Troubleshooting Bluetooth Connections with Go Direct Sensors<\/a><\/li>\n<li><a href=\"\/til\/12943\/\">What can I do if a Go Direct sensor's Bluetooth LED flashes red and green when I try to connect to it and the connection fails?<\/a><\/li>\n<li><a href=\"\/til\/3857\/\">Will my device work with Go Direct Sensors via Bluetooth?<\/a><\/li>\n<li><a href=\"\/til\/3085\/\">How do I know if my LabQuest will work with Go Direct Sensors and Go Wireless devices?<\/a><\/li>\n<\/ul>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n<ul class=\"wp-block-list\">\n<li>Optical encoder: Bidirectional, quadrature encoder, 360 cycle per revolution<\/li>\n<li>Resolution: 1\u00b0 or 0.25\u00b0 <\/li>\n<li>Maximum Speed<br \/>\u26ac 1\u00b0 resolution: 30 rev\/s <br \/>\u26ac 0.25\u00b0 resolution: 7.5 rev\/s<\/li>\n<li>3-step Pulley Dimensions<br \/>\u26ac Groove diameters: 10 mm, 29 mm, and 48 mm<br \/>\u26ac O ring diameter (when in outer groove): 55 mm<\/li>\n<li>Connections<br \/>\u26ac Wireless: Bluetooth<sup>\u00ae<\/sup> v4.2 (wireless range 30 m unobstructed) <br \/>\u26ac Wired: USB 2.0 full speed<\/li>\n<li>Battery: <a href=\"https:\/\/www.vernier.com\/product\/go-direct-300-mah-replacement-battery\/\">300 mAh Li-Poly<\/a><br \/>\u26ac Battery Life (single, full charge): ~24 hours continuous data collection<br \/>\u26ac Battery Life (lifetime): 2 \u2013 5 years (typical)<\/li>\n<\/ul>\n<p class=\"has-very-light-gray-background-color has-background\">For specifications on the Rotational Motion Accessory Kit parts, see <a href=\"\/til\/2732\/\">What are the moments of inertia of the disks included in the Rotary Motion Accessory Kit?<\/a><\/p>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<h3 class=\"wp-block-heading\">Battery Troubleshooting<\/h3>\n<ol class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging. <\/span><br \/>\u26ac T<span style=\"font-weight: 400;\">ry charging the sensor for several hours and testing again.<\/span><\/li>\n<li>If after charging the battery the sensor turns on while connected via USB and briefly connects to Graphical Analysis but gives repeated communication errors and\/or resets the selected wavelength, then the battery may be bad. <span style=\"font-weight: 400;\">To verify this is a battery issue (and not a bad USB port or cable), try swapping the battery with a working sensor to see if the problem follows the battery or stays with the sensor.<\/span><br \/>\u26ac If the problem stays with the sensor, the battery is probably not the issue.<br \/>\u26ac If the problem follows the battery, <span style=\"font-weight: 400;\">the battery has likely reached its end of life.<\/span><\/li>\n<li>In this state, the sensor cannot be used even if connected by USB, so the battery will need to be replaced. <span style=\"font-weight: 400;\"><a href=\"\/product\/go-direct-300-mah-replacement-battery\/\">Go Direct&reg; 300 mAh Replacement Battery<\/a> (<nobr>GDX-BAT-300<\/nobr>)<\/span><\/li>\n<li>See <a href=\"\/til\/4014\/\">How do I remove or replace a Go Direct battery?<\/a> for more information (including <a href=\"https:\/\/youtu.be\/5XF8rHbcqzQ\">a video<\/a>).<\/li>\n<\/ol>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<p class=\"has-text-align-center has-very-light-gray-background-color has-background\"><span style=\"font-weight: 400;\"><strong>Rechargeable batteries are covered by a one-year warranty.<\/strong><\/span><br \/>Batteries <span style=\"font-weight: 400;\">should last two to five years in typical use. <\/span><\/p>\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Related Products<\/h3>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/product\/micro-usb-to-usb-c-cable\/\">Micro USB to USB-C Cable<\/a> (<nobr>CB-USB-C-MICRO<\/nobr>)<\/li>\n<li><a href=\"\/product\/go-direct-charge-station\/\">Go Direct<sup>&reg;<\/sup> Charge Station<\/a> (<nobr>GDX-CRG<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotational-motion-accessory-kit\/\">Rotational Motion Accessory Kit<\/a> (<nobr>AK-RMV<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-motor-kit\/\">Rotary Motion Motor Kit<\/a> (<nobr>MK-RMV<\/nobr>)<\/li>\n<li><a href=\"\/product\/advanced-physics-with-vernier-mechanics\/\"><i>Advanced Physics with Vernier &mdash; Mechanics<\/i><\/a> (<nobr>PHYS-AM<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-sensor\/\">Rotary Motion Sensor<\/a> (<nobr>RMV-BTD<\/nobr>)<\/li>\n<\/ul>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Replacement Parts<\/h3>\n<h4 class=\"wp-block-heading\"><strong>GO DIRECT ROTARY MOTION SENSOR<\/strong><\/h4>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/product\/go-direct-300-mah-replacement-battery\/\">Go Direct&reg; 300 mAh Replacement Battery<\/a> (<nobr>GDX-BAT-300<\/nobr>)<\/li>\n<li><a href=\"\/product\/micro-usb-cable\/\">Micro USB Cable<\/a> (<nobr>CB-USB-MICRO<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-sensor-replacement-pulley\/\">Rotary Motion Sensor Replacement Pulley<\/a> (<nobr>RMV-PULLEY<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-sensor-replacement-parts-kit\/\">Rotary Motion Sensor Replacement Parts Kit<\/a> (<nobr>RMV-RPK<\/nobr>)<\/li>\n<\/ul>\n<h4 class=\"wp-block-heading\"><strong>ROTATIONAL MOTION ACCESSORY KIT<\/strong><\/h4>\n<ul class=\"wp-block-list\">\n<li><a href=\"\/product\/rotary-motion-sensor-replacement-parts-kit\/\">Rotary Motion Sensor Replacement Parts Kit<\/a> (<nobr>RMV-RPK<\/nobr>)<\/li>\n<li><a href=\"\/product\/ultra-pulley-attachment\/\">Ultra Pulley Attachment<\/a> (<nobr>SPA<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-sensor-replacement-swivel-mount\/\">Rotary Motion Sensor Replacement Swivel Mount<\/a> (<nobr>RMV-SWIVEL<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-sensor-replacement-mass\/\">Rotary Motion Sensor Replacement Mass<\/a> (<nobr>RMV-MASS<\/nobr>)<\/li>\n<li><a href=\"\/product\/rotary-motion-sensor-replacement-washer\/\">Rotary Motion Sensor Replacement Washer<\/a> (<nobr>RMV-WASH<\/nobr>)<\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Go Direct\u00ae Rotary Motion Sensor GDX-RMS\u2014Sensor onlyGDX-RMPK\u2014Sensor + Accessory Kit Specifications and User Guide Troubleshooting General: Press the power button on the sensor to turn&#8230;<\/p>\n","protected":false},"author":43901,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[631,6838,720,1904,52,51,1135],"class_list":["post-4051","post","type-post","status-publish","format-standard","hentry","tag-gdx-rms","tag-gdxrmsmain","tag-maintil","tag-rmsmain","tag-rotary","tag-rotary-motion","tag-rotation"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/43901"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=4051"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4051\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=4051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=4051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=4051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}