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Topic: 3 atmegas, one wall wort (Read 504 times) previous topic - next topic

treebykooba

Hello,

Quick question...I just want to make sure before I put it together...that I would be okay to use three ATMega 328p-pu's with one 9v wall wort and one 7805 voltage regulator. Would I need three voltage regulators, one for each chip? Or is one okay?

Thanks for any input

RuggedCircuits

One should be OK. Each ATmega328 (by itself) should consume no more than about ~20mA, multiplied by 3 gives you 60mA, and the power dissipation of the regulator will then be about (9-5)*0.06 = 0.24W which should pose no problems.

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The Basic Motor Driver: simple, inexpensive motor driver for 1 stepper motor or 2 DC motors

retrolefty


Hello,

Quick question...I just want to make sure before I put it together...that I would be okay to use three ATMega 328p-pu's with one 9v wall wort and one 7805 voltage regulator. Would I need three voltage regulators, one for each chip? Or is one okay?

Thanks for any input


If all three 328p chips and the support components wired to them draw less then the maximum current output of the regulators then it would be ok. A 328p by itself draws around 25ma or so, so it really depends on what else requires current in your project that will decide if one 1 amp max 5vdc voltage regulator will suffice or not.

Lefty


JoeO


Hello,

Quick question...I just want to make sure before I put it together...that I would be okay to use three ATMega 328p-pu's with one 9v wall wort and one 7805 voltage regulator. Would I need three voltage regulators, one for each chip? Or is one okay?

Thanks for any input

How much current can your wall wart supply at 9V?

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