Is my battery sufficient?

Other Hardware Motors, Mechanics, Power and CNC
1

Hi :slight_smile:
This is the third time I hack with an arduino, so my knowledge is limited, and I have a problem.

Regarding this problem, I'm using:

Here is a diagram of the connection of the components mentioned above:

image
image1493×966 37.3 KB

You can find details about the connections and the code I use on the GitHub project.
It's not finished, but I'm working on it.

My problem is shown here in video.
Here's step by step what happens:

  • 3 beeps (indicating that the arduino has started, and is ready)
  • 3 more beeps (alerting that the mowing motor will start)
  • When the motor tries to start, one out of four times, the arduino restarts.

Is this because the motor places too much demand on the battery, which no longer has available amperage for the Arduino?

Thank you in advance for the help!

2

Yes. A 120W, 12V motor draws 10 Amperes at full power, and probably 50 Amperes or more at startup, which the battery cannot supply (and the relay contacts cannot handle).

Power the Arduino with a separate battery.

3

Possibly, connect the mower directly to the battery.

For quick and dirty test measure the battery voltage with a DVM.

See if there are voltage dips.

Do this while making and breaking the battery connection.

You may also be getting huge inductive spikes from the mower’s motor.

4

The amazon links are sales info, no in depth technical data. Nice picture but hard to follow and no annotation.

5

Thanks for your help.
Control the motor with this component seems to avoid me this problem. I can ask the motor to speed up slowly. Are you agree with that ?

6

I’m sorry about that, as I said, « my knowledge is limited ». Can you please show me an exemple of what you would see the next time ? (About the picture)

7

That would probably work, but you don't need bidirectional control. An "ESC" (Electronic Speed Control) or unidirectional eBike controller would also work.

8

You shouldn't buy at amazon at all. I say this just because of technical reasons.
Most offers on amazon have pretty pictures but have no in depth technical data.

Same for the 50A MOS-FET controller.
There is a lot of text but the most important information is missing:

What exact type of MOS-FET is mounted on this module?
Knowing the type would make it possible to lookup more details like
threshold voltage and diagrams

Is the 50A a short-time maximum-current (less than a second? 5 seconds? )
or
the permanent current that this MOS-FET can stand?

Does the module have flyback-diodes?

what is the RS-on-resistance of the MOS-FET?

And additional in my personal experience for electronic components amazon has not the best price.

best regards Stefan

9

Thank you. This should work too, and it seems to cost less :slight_smile: