Timeline for Activate multiple relays with one Arduino Uno
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Apr 3, 2023 at 18:09 | comment | added | jonathanjo | Other than the base resistors, are there pros/cons or would you say they are pretty much equivalent for this type of circuit? | |
| Apr 3, 2023 at 17:25 | comment | added | Kuba hasn't forgotten Monica | @jonathanjo One less thing to worry about with an NMOS - no need to put base resistors or buy transistors with base resistors. | |
| Apr 3, 2023 at 17:24 | comment | added | Kuba hasn't forgotten Monica | @Carl Yes. Usually a given size of a relay has a fixed power rating of the coil. So the higher the coil voltage rating, the higher the coil resistance, and the lower the coil current. | |
| Apr 3, 2023 at 13:25 | vote | accept | Carl | ||
| Apr 3, 2023 at 13:25 | comment | added | Carl | @Kubahasn'tforgottenMonica Why would he coil currents be smaller for a 12V relay than a 5V relay? Does this have something to do with the coil resistance of the different relays? | |
| Apr 3, 2023 at 13:10 | comment | added | jonathanjo | @Kubahasn'tforgottenMonica could you comment about the pros/cons of this vs BJT version eg electronics.stackexchange.com/a/386124 | |
| Apr 3, 2023 at 13:07 | comment | added | Kuba hasn't forgotten Monica | @Carl Yes, the UNO and 5V coil supply grounds need to be connected. The coil voltage can also be higher than 5V - that will make the coil currents smaller. E.g. if you have 12V available and 12V relays, then the circuit doesn't change at all. | |
| Apr 3, 2023 at 13:04 | history | edited | Kuba hasn't forgotten Monica | CC BY-SA 4.0 |
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| Apr 3, 2023 at 13:00 | comment | added | Carl | Thank you very much for this good answer. Just to be sure, the Uno and the external supply has to have same ground, right? Also, could you clarify why a 1uF capacitor is needed in parallel with the relay and MOSFET? | |
| Apr 3, 2023 at 12:59 | history | edited | winny | CC BY-SA 4.0 |
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| Apr 3, 2023 at 12:55 | history | answered | Kuba hasn't forgotten Monica | CC BY-SA 4.0 |