Timeline for Reading +/- 12V with 3.3V micro
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 13, 2020 at 7:34 | vote | accept | mapomapo | ||
| Jun 10, 2020 at 12:40 | comment | added | SamGibson♦ | @mapomapo - Please remember to come back and accept (green "tick") the best answer (this one, or an even better one, if a better one is posted) to indicate that your problem is solved. See: "What should I do when someone answers my question?" Thanks. | |
| Jun 10, 2020 at 12:36 | history | edited | SamGibson♦ | CC BY-SA 4.0 |
Forced line breaks (2 x space at EOL) so that the 3 lines of calculations display correctly, and don't "run together" (which makes them difficult to understand).
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| Jun 10, 2020 at 7:10 | comment | added | mapomapo | thanks, I re read and understand the calculation ( most important things) I'm going with 28/38K and 110K on the 12v , this results into a 3.191 maximum voltage that it's more safe than exactly 3.3v on the mcu input . THANKS!!!! | |
| Jun 10, 2020 at 6:49 | comment | added | mapomapo | yep I'm actually still design. for final consideration which will be the range on output ? at 12V = 3.3v and -12V ? sorry maybe stupid question but I'm really novice | |
| Jun 10, 2020 at 6:46 | comment | added | Spehro 'speff' Pefhany | You can leave D2. D1 looks like it should have died already if -12 is relative to ground. | |
| Jun 10, 2020 at 6:40 | comment | added | mapomapo | You're my new HERO!!! :) at this point I would need to remove diode too ? | |
| Jun 10, 2020 at 6:01 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 4.0 |