Max current draw of SumoBot?

soundhack

I am trying to spec out the cheapest wall adapter I can get to power the sumobot. I am assuming the servo motors will be drawing the most current, but I haven't been able to find the max current draw of the continuous servos.

Can someone provide an estimate of the total max current draw?

Thanks,
Robert
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Ryan Clarke

Hi Robert-

Consider: the stamp itself will consume approximately 3 mA (run)-

You also have the servos, which are modified Futaba S148s- 8mA (idle) and varies when running- for sake of argument let's say 1000 mA run

In reality you should be fine with a 7.5v 1000 mA supply-

Do you plan on running these with a power tether?

Ryan

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Ryan Clarke
Parallax Tech Support

RClarke@Parallax.com

allanlane5

Darn, a FULL AMP when running? That seems way high. 100 mA, OK, 250 mA when 'stalled', ok.

Ryan Clarke

You'll notice I suggested a 1 A supply, and the "for sake of argument" was intentional wording as well.

Spikes can happen on stalls, albeit momentarily.

Ryan

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Ryan Clarke
Parallax Tech Support

RClarke@Parallax.com

soundhack

Thanks very much! I was guesstimating precisely that amount, with a certain amount of fudge factor factored in [noparse]:)[/noparse]

I am actually going to be teaching a class using the sumobots, and while the students get started learning PBASIC, the tools, and working with sensors I wanted them to not worry about batteries running down, hence the external power. Even playing with servos can be accomplished by putting the bot "on blocks."

Thanks again,
Robert
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