Issue with 10V power supply

[benoitmaillard08]

Hi !

When I power the raspirobot with a 10V battery, the Raspberry Pi doesn't boot and LEDs (both from raspirobot and the green one from the Pi) start to flash approximatively every second. It works when I power it with only 8V, but that's not enough for the motors I'm using.

Can you help me ? Thanks !

[simonmonk]

It sounds like the battery voltage is dropping as soon as its loaded by the Pi. What kind of battery are you using?

Si.

On 7 September 2016 at 18:13, blm08 notifications@github.com wrote:

Hi !

When I power the raspirobot with a 10V battery, the Raspberry Pi doesn't boot and LEDs (both from raspirobot and the green one from the Pi) start to flash approximatively every second.

Can you help me ? Thanks !

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/simonmonk/raspirobotboard2/issues/13, or mute the thread https://github.com/notifications/unsubscribe-auth/ACAvUef7Iu_n-HbaHD2OgEK_kTAfYjgoks5qnvDDgaJpZM4J3J1N .

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[benoitmaillard08]

Well, I'm using two USB batteries in series with 5V 1A each, which results theorically in a 10V 1A power supply. Is there any way to fix that voltage drop ?

[simonmonk]

If you are using USB LiPo battery backup devices, then the problem is likely to current limiting at 0.5A. As soon as the motors try and draw more, both batteries will drop the voltage to protect themselves.

Have you tried using one battery to power the PI and a separate one to power the motors? Note the RRB3 library has the option to specify the battery and motor voltages.

Si.

On 13 September 2016 at 11:08, blm08 notifications@github.com wrote:

Well, I'm using two USB batteries with 5V 1A each in series, which results theorically in a 10V 1A power supply. Is there any way to fix that voltage drop ?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/simonmonk/raspirobotboard2/issues/13#issuecomment-246636015, or mute the thread https://github.com/notifications/unsubscribe-auth/ACAvUZLsg-lsDXfh66O5atHN4KqVeIhHks5qpnY7gaJpZM4J3J1N .

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[benoitmaillard08]

It is actually Li-Ion batteries, they are able to provide more than 0.5A because it works well with only one of them (but the motors don't get enough power).

Using one battery to power the Pi and another to power the motors seems interesting though. Can I still do it with RRB2 ? If so, how can I do that concretly ?

Thanks again for your help, it would be really great if that worked !

[benoitmaillard08]

Any news about it ?