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simonmonk / raspirobotboard2

Software for the RaspiRobot Board Version 2
MIT License
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12V 4.2A input? #3

Open HsienYu opened 9 years ago

HsienYu commented 9 years ago

Hi, I am wondering is the input voltage same as v1 (5v ~ 12`v)?

thanks!!

simonmonk commented 9 years ago

The RRB2 will cope with up to 15V in.

However, be aware that unlike the RRB1, the RRB2 supplies 5V regulated power to the motors, rather than the input voltage.

Si.

On 7 May 2015, at 10:44, "H.Y.C." notifications@github.com wrote:

Hi, I am wondering is the input voltage same as v1 (5v ~ 12`v)?

thanks!!

— Reply to this email directly or view it on GitHub.

Simon Monk. http://www.simonmonk.org

HsienYu commented 9 years ago

Cool, thanks! I have other question, my pi b 2 always reboot when I use rrrb2. It often happens when I except command via ssh with wifi dongle.

simonmonk commented 9 years ago

What battery pack are you using?

The problem is that the battery voltage will drop, when say motors start up and if the voltage drops too low it causes the Pi to restart. Using something like a 7.4V LiPo battery or 6 x AA battery pack should prevent this.

Si.

On 7 May 2015, at 13:07, "H.Y.C." notifications@github.com wrote:

Cool, thanks! I have other question, my pi b 2 always reboot when I use rrrb2. It often happens when I except command via ssh with wifi dongle.

— Reply to this email directly or view it on GitHub.

Simon Monk. http://www.simonmonk.org

Simon Monk. http://www.simonmonk.org

HsienYu commented 9 years ago

I am using 6 x AA and 12v dc 4.2a adapter for testing, but with 6 xAA the reboot issue still happenes when I execute command. um... kind of wired. But thanks a lot!! I will check all the details and update soon!

HsienYu commented 9 years ago

Hi Simon, I did the setup with 7.4V LiPo battery, but it seem to be nothing changed. My pi also often reboot when my motor started.

Do you know some way to avoid this kind of things happen?

Thank you very much!!

simonmonk commented 9 years ago

What kind of motors are you using?

One trick is to put a high value capacitor say 1000uF 25V in the Vin screw terminals (longer lead of capacitor to +V).

Another trick is to start the motor at slow speed first then increase speed after say 1/10 second.

Si.

On 9 May 2015, at 12:37, "H.Y.C." notifications@github.com wrote:

Hi Simon, I did the setup with 7.4V LiPo battery, but it seem to be nothing changed. My pi also often reboot when my motor started.

Do you know some way to avoid this kind of things happen?

Thank you very much!!

— Reply to this email directly or view it on GitHub.

Simon Monk. http://www.simonmonk.org

HsienYu commented 9 years ago

I am using regular 7.2 dv motor. I did try increasing speed, it's fine now. Thank you very much and appreciate that!!

Have a good day!