Timeline for Ok to Connect 2.9V Stepper to 3.3V pin?
Current License: CC BY-SA 4.0
18 events
| when toggle format | what | by | license | comment | |
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| Feb 1, 2021 at 13:37 | comment | added | jsotola | @Duncan the L9110 datasheet specifies a wide power supply voltage range | |
| Feb 1, 2021 at 13:30 | comment | added | Duncan C | @jsotola, Doesn't a motor driver have solid state circuitry that needs a regulated power source? Or is it just an H-bridge built with MOSFETs that can tolerate a wide range of input voltages? | |
| Feb 1, 2021 at 10:32 | vote | accept | Mohamed Technology | ||
| Jan 30, 2021 at 22:17 | comment | added | jsotola | use two AA cells in series ... use C or D cells for more capacity | |
| Jan 30, 2021 at 8:50 | comment | added | Sim Son | There are very cheap dcdc converters with an onboard potentiometer to adjust outout voltage. The only cheaper (and very dirty) solution could be to use a 5V usb charger and put 3 Si diodes in series. The diodes will drop the voltage to 5V-3×0.7V=2.9V. The diodes should be rated for 1W power dissipation, just to be save | |
| Jan 29, 2021 at 22:02 | comment | added | chrisl | "I didn't have a 3V power supply so I used a Voltage Divider" - You cannot use a voltage divider to power a circuit, because the voltage will be dependent on how much current your circuit draws. There is no cheaping out there. You should really buy a fitting voltage regulator. They are not that expensive. And if your circuit is dtationary, you could get stable and powerfull 5V from typical USB phone chargers. Then buy a voltage regulator for getting from 5 to 3V, which also can provide enough current. | |
| Jan 29, 2021 at 19:27 | comment | added | Mohamed Technology | Is it fine if I used a 1n4007 diode to "protect" The Arduino UNO from The Motor? Or it will be useless?? | |
| Jan 29, 2021 at 18:58 | history | edited | Mohamed Technology | CC BY-SA 4.0 | added 366 characters in body |
| Jan 29, 2021 at 18:20 | answer | added | Duncan C | timeline score: 3 | |
| Jan 29, 2021 at 18:04 | history | edited | Mohamed Technology | CC BY-SA 4.0 | added 117 characters in body |
| Jan 29, 2021 at 17:46 | comment | added | Mohamed Technology | Oops... I powered it directly from the arduino... but it's still alive(I think) | |
| Jan 29, 2021 at 17:44 | history | edited | Mohamed Technology | CC BY-SA 4.0 | added 57 characters in body |
| Jan 29, 2021 at 17:04 | review | Close votes | |||
| Feb 14, 2021 at 3:01 | |||||
| Jan 29, 2021 at 16:20 | comment | added | st2000 | It is unclear from your description / question if you are connecting a stepping motor directly to the pins on an Arduino. Further, we do not know which Arduino you are using. But, in general, an Arduino's outputs are likely directly connected to the processor. And there are no (or very few) processors that can survive getting 800mA pulled from one of their output pins. So do be very careful or you may burn out the processor. | |
| Jan 29, 2021 at 16:17 | comment | added | timemage | It may just because I'm not completely awake, but I'm finding it difficult to follow your wiring description. A diagram or schematic would be better. | |
| Jan 29, 2021 at 16:17 | comment | added | Peter Paul Kiefer | I don't think the motor will be your problem. I think the arduino is in danger. If the motor is powered 0.4V higher than specified, who cares. But you try to draw 800 mA from the arduino 3.3V output. That's too much. Just use an external power to drive the motor, not the arduino. BTW: I assume you' ll use a L9110 Module with two driver chips. One L9110 alone is only useful for DC motor; not for steppers. | |
| Jan 29, 2021 at 15:48 | review | First posts | |||
| Jan 29, 2021 at 16:44 | |||||
| Jan 29, 2021 at 15:38 | history | asked | Mohamed Technology | CC BY-SA 4.0 |