Timeline for Is it safe to use 3V3 on raspberry pi 3B+ to control a 3V DC motor?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Feb 28, 2020 at 6:20 | answer | added | Seamus | timeline score: 3 | |
| Feb 28, 2020 at 5:56 | comment | added | tlfong01 | In case you would like to look at the back EMF voltage pulse that might fry your Rpi, here is a scope screen capture: "5V Solenoid creates a Back EMF 25V peak to peak": raspberrypi.org/forums/…. Good luck, good health, and God bless your Rpi. Cheers | |
| Feb 28, 2020 at 4:09 | comment | added | tlfong01 | So, there might be a 10 volt or higher to oppose the current change, this current, running in the opposite direction, shorts the Rpi power and signal circuit, generates heat, which happily fries the electronics stuff, and raises blue or white smoke, so get your smart phone camera ready to selfie the memorable moment of smoke getting into your eyes :) | |
| Feb 28, 2020 at 4:08 | comment | added | tlfong01 | (4) Lenz's Law says: "Every motor has a back EMF to fri your Rpi". Every motor has a start and stall current many times than the working current. Eg, if your 3V motor drinks 500mA when running, the start and stop current might be 1.5A, frying the Rpi. Eg, When you try to break/switch off the current of a running 3V motor, the motor's inductive coil refuses to break the current passing through it abruptly, and would try to counter the current change, using whatever back EMF to maintain the current, and often many times than the supply voltage. / to continue, ... | |
| Feb 28, 2020 at 4:07 | comment | added | tlfong01 | Hello @Redlik, Welcome and nice to meet you. Ah, let me see. I think there is 97% chance you will fry the toy sooner, or later, for the following reasons: (1) Murphy's law says "Whatever Rpi will fry, will fry", (2) Doris Day also says "Whatever Rpi Will Fry, Will Fry", (3) JM Keynes also says: "In the long run we [Rpi's] are all dead", / to continue, ... | |
| Feb 28, 2020 at 3:57 | comment | added | Milliways | Depends on the motor and how you connect it. I wouldn't use 3.3V - 5V is OK | |
| Feb 28, 2020 at 3:40 | review | Low quality posts | |||
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| Feb 28, 2020 at 3:25 | review | First posts | |||
| Feb 28, 2020 at 15:25 | |||||
| Feb 28, 2020 at 3:20 | history | asked | Redlik | CC BY-SA 4.0 |