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Topic: servo works when connected with usb but not with 9v reg power supply (Read 1 time) previous topic - next topic

johnwasser


what kind of power supply? i don't want to constantly be replacing batteries...


6V and about 1A per servo.
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dadamssg

I'm very new to electronics so forgive me. Will getting a another 9v reg wall wart, cutting the ends and plugging those into a breadboard with a voltage regulator work and be the cheapest/best option? If so, how would i go about sharing the ground with the arduino? Would i just leave the ground cable from the wall wart unplugged and use a jumper from the breadboard to the ground on the arduino?

michinyon

You probably don't need another wall wart.   What I would try doing,  is taking another wire from the 9V of the supply to another regular to supply the servo power supply,   separately from using the 5V regulator chip on the arduino board.

dadamssg

I'm not sure i understand. The wall wart i have plugs straight into the barrel jack of the arduino. How would i get another wire from it?

retrolefty

#9
Jan 23, 2013, 05:24 pm Last Edit: Jan 23, 2013, 05:26 pm by retrolefty Reason: 1

I'm not sure i understand. The wall wart i have plugs straight into the barrel jack of the arduino. How would i get another wire from it?


The shield Vin pin is wired to the barrel jack's positive terminal (through a series polarity protection diode) so it's avalible for your use as a 'raw' 9vdc in your case using that 9v power module you showed. But keep in mind that your servo may still draw more current then the 9vdc module might be able to supply and in any event you can't draw more then 1 amp from the Vin pin because of the polarity protection diode which is rated for 1 amp maximum current.

Servos have motors in them, motors tend to draw lots of current depending on the mechanical load placed on them, so planning proper power management for servo(s) is not a slam dunk easy task sometimes.

Lefty

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