{"id":1853,"date":"2024-07-22T01:38:49","date_gmt":"2024-07-21T18:38:49","guid":{"rendered":"https:\/\/www.tneutron.net\/mikro\/?p=1853"},"modified":"2024-07-18T08:28:35","modified_gmt":"2024-07-18T01:28:35","slug":"rotary-potentiometer-application","status":"publish","type":"post","link":"https:\/\/www.tneutron.net\/mikro\/rotary-potentiometer-application\/","title":{"rendered":"Rotary Potentiometer Application"},"content":{"rendered":"

Example 1.<\/span>
\n Suppose that when the wipers are above the output (figure 2.4) the resulting 10V is at an angle of 350 \u00b0, while the middle wiper produces 5 V output at an angle of 175 \u00b0.<\/span> So what is the voltage generated when the wiper shows an angle of 82 \u00b0<\/span><\/p>\n

Answer:<\/span>
\n The resulting voltage at an angle of 82 \u00b0 = 82 \u00b0 x (10 V \/ 350 \u00b0) = 2.34 Vdc<\/span>
\n\"clip_image007\"<\/a>
\n Potentiometer image as a position measurement tool<\/span><\/p>\n

The potentiometer being discussed is actually a voltage divider and will work well if the same electrical current flows across the potentiometer resistance.<\/span> The loading error occurs when the wiper of the potentiometer is connected to a circuit that has an input resistance not too large from potentiometer resistance.<\/span> So the current passing through the wiper is reduced and causes the voltage reading to decrease.<\/span> This can be overcome by a high impedance buffer circuit eg using a voltage follower mounted between the potentiometer with the measured circuit.<\/span>
\n\"clip_image008\"<\/a><\/p>\n

Example 2<\/span>
\n Robot arm on the picture below.<\/span> rotating 120 \u00b0 stop to stop and potentiometer used as position sensor.<\/span> The controller is an 8 bit digital system and needs to know the current position with a resolution of 0.5 \u00b0<\/span>
\n Answer:<\/span>
\n To obtain a resolution of 0.5 \u00b0 means that all 120 \u00b0 must be divided into 240 increments and each increase is 0.5 \u00b0.<\/span> The 8 bit number has 255 levels (from 0000 0000 to 1111 1111) so it’s enough for this job.<\/span> The potentiometer is supplied with a 5V tension so that the output of the potentiometer is 5V for a maximum angle of 350 \u00b0 (if it is assumed the potentiometer can be fully rotated).<\/span> The reference voltage of the ADC (analog to digital converter) is also 5V so that if the 5V potentiometer output voltage means the digital output is<\/span>
\n 255 (1111 1111bin).<\/span> The potentiometer rotates 350 \u00b0 but the robotic arm only rotates 120 \u00b0 so the gear ratio is 2: 1.<\/span> With this setting the potentiometer rotates 240 \u00b0 when the robot arm rotates 120 \u00b0<\/span><\/p>\n

\"clip_image011\"<\/a>
\n Potentiometer image as a rotation sensor on the robot arm<\/span><\/p>\n

For example when the robot arm rotates 10 \u00b0 then potentiometer will rotate 20 \u00b0.<\/span> And the potentiometer voltage is: 20 \u00b0 x (5 V \/ 350 \u00b0) = 0.29 V. This voltage will be converted by ADC into digital quantity: 0.29 V x (255 \/ 5V) = 14.8 \u224815 = 0000<\/span>
\n 1111bin<\/span>
\n Back to the resolution problem of this measurement is:<\/span>
\n\"clip_image012\"<\/a><\/p>\n

It turns out the resolution is 0.686 \u00b0 while the requested is 0.5 \u00b0 to overcome this.<\/span> To improve this resolution we look back.<\/span> We calculate this equation with the assumption that the potentiometer emits 5V at 350 \u00b0 but the potentiometer actually uses only 240 \u00b0.<\/span> Therefore to increase the resolution can be adjusted by increasing the voltage of 7.3 V (5 V x 350 \u00b0 \/ 240 \u00b0).<\/span> So the resolution now:<\/span>
\n\"clip_image014\"<\/a>
\n This resolution is still within the range of 0.5 \u00b0 to specification<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Example 1. Suppose that when the wipers are above the output (figure 2.4) the resulting 10V is at an angle of 350 \u00b0, while the middle wiper produces 5 V output at an angle of 175 \u00b0. So what is the voltage generated when the wiper shows an angle of 82 \u00b0 Answer: The resulting …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1238],"tags":[2609,2610,2611,2612,2613,2614,2615,2616,2617,2618,2619,2620,2621,2622,2623,2624,2625,2626,2627,2628,2629,2630],"class_list":["post-1853","post","type-post","status-publish","format-standard","hentry","category-english","tag-10k-rotary-potentiometer-datasheet","tag-10k-rotary-potentiometer-with-switch","tag-22k-rotary-potentiometer","tag-2k-rotary-potentiometer","tag-360-rotary-potentiometer","tag-5-pin-rotary-potentiometer","tag-50k-rotary-potentiometer","tag-50k-rotary-potentiometer-with-switch","tag-5k-ohm-rotary-potentiometer-datasheet","tag-7-pin-rotary-potentiometer","tag-9-mm-square-rotary-potentiometers","tag-9mm-rotary-potentiometer","tag-a-rotary-potentiometer-is-used-as-a-position-sensor","tag-b100k-rotary-potentiometer","tag-b103-rotary-potentiometer","tag-b10k-rotary-potentiometer","tag-bei-rotary-potentiometer","tag-bosch-rotary-potentiometer","tag-bourns-rotary-potentiometer","tag-continuous-rotary-potentiometer","tag-difference-between-rotary-encoder-potentiometer","tag-digital-potentiometer-rotary-encoder"],"yoast_head":"\nRotary Potentiometer Application - TN Mikro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tneutron.net\/mikro\/rotary-potentiometer-application\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Rotary Potentiometer Application - TN Mikro\" \/>\n<meta name=\"twitter:description\" content=\"Example 1. Suppose that when the wipers are above the output (figure 2.4) the resulting 10V is at an angle of 350 \u00b0, while the middle wiper produces 5 V output at an angle of 175 \u00b0. 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