Timeline for Reading potentiometer value in high voltage circuit externally
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Mar 7, 2023 at 16:40 | vote | accept | mm3psych0sis | ||
| Mar 7, 2023 at 16:32 | history | edited | JRE | CC BY-SA 4.0 |
deleted 7 characters in body
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| Mar 7, 2023 at 16:31 | answer | added | GodJihyo | timeline score: 1 | |
| Mar 7, 2023 at 16:26 | comment | added | jsotola | use a dual gang potentiometer | |
| Mar 7, 2023 at 16:21 | comment | added | StainlessSteelRat | But you are not being very clear in what you want, as Andy points out. High voltage? 40V going to 5V. Is high voltage 40V? What is going to prevent wiper to go to high voltage? 40V will fry Arduino. You don't measure potentiometer, you measure voltage. | |
| Mar 7, 2023 at 16:19 | comment | added | user319836 | Neither of your circuits will work. If you want a better way, then we need more information. | |
| Mar 7, 2023 at 16:17 | comment | added | Andy aka | If you want to measure the value of a potentiometer, one way is to read the wiper voltage AND the voltage on the non-grounded end of the potentiometer. To do both these things effectively (and without detonating the Arduino), more details are needed so that the necessary extra resistor values can be calculated. Maybe you are trying only to read the wiper voltage but, that is contrary to "measuring the value of the potentiometer". So, no, I don't believe you have been very clear so far. | |
| Mar 7, 2023 at 16:17 | comment | added | Hearth | You have 40 V going to the 5 V pin on your Arduino. It won't survive that. | |
| Mar 7, 2023 at 16:08 | comment | added | mm3psych0sis | Thought I was pretty clear in stating that I wanted a way of measuring the value of a potentiometer that is already in a circuit with a microcontroller. If you're asking me to explain why I want to do this so that alternatives can be suggested, then I'm not interested. Point of making this specific thread was to inquire if such a circuit was possible. | |
| Mar 7, 2023 at 16:01 | comment | added | Andy aka | Both of those circuits would fairly immediately burn your Arduino. So, instead of showing circuits that won't work (in the hope that they impart something useful to the reader), please explain what you are trying to do more technically. | |
| Mar 7, 2023 at 15:56 | history | asked | mm3psych0sis | CC BY-SA 4.0 |