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Author Topic: Do i need a separate power supply for multiple HCSR04 ultrasonic modules?  (Read 259 times)
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tawandapro
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« on: February 08, 2013, 08:58:40 pm »
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two work fine on my current robot.  I am to up the ante by using my arduino on a larger system which may require as much as 8 on my offroading one. I will also have 2 temperature sensors to monitor my mootor driver temp and switch the fan on when needed.

I am thinking of putting a 5v regulator with a common ground to power up my sensors. any thoughts? i have a 5v 1amp regulator gathering dust.
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johnwasser
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« Reply #1 on: February 08, 2013, 10:08:01 pm »
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The only current specification I can find for the HC-SR04 is "quiescent current : <2mA".

I'm guessing that the active current draw is low enough that running 8 of them off the Arduino power rail would not be a problem.
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tawandapro
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« Reply #2 on: February 08, 2013, 10:39:09 pm »
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2ma is great.  i will let you know how i go.
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