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811  Using Arduino / Programming Questions / Re: if any object resists my dc motor how can i stop it ? on: June 12, 2014, 11:09:38 am
Could I have the link to your thread or is it the one you posted above?

No, a new one
812  Using Arduino / Programming Questions / Re: if any object resists my dc motor how can i stop it ? on: June 12, 2014, 11:01:14 am
Quote
Is that what the current sensors built into an L298 are for?
Good catch, I forgot they had sensors in them. The board i'm using (here)doesn't have any breakout pins to the sensors, unless you trace and measure from the resistors.

Whoever makes those boards should include pins from the sensors.

I've just started a thread about sensing current on a MotoMama, which also uses a 298 and doesn't bring the pins out. But it does seem the pins go to resistors, although I doubt if they are the current sense resistors which need to be in the whole Watt range.
813  Using Arduino / Motors, Mechanics, and Power / Current sensing on a MotoMama L298 shield on: June 12, 2014, 10:43:41 am
Hi all,

I know how to sense current on an L298 h-bridge, but I'm wondering if anyone has done it on the MotoMama shield which uses that chip.

As far as I can see, pins 1 and 15 aren't brought out anywhere. From the attached pic you can see I managed to attach a small hook jumper thingy onto pin1, but I don't think that's ideal. It's very cramped in there and I'm worried about a short.

Anybody tried this?

Edit... I tried to follow the traces and the pins might go to small resistors along the back. I doubt if these are the current sense resistors though since afaik those need to be in the whole Watt range do they not? (and anyway, they're also not broken out to hook up to)
814  Using Arduino / Programming Questions / Re: if any object resists my dc motor how can i stop it ? on: June 12, 2014, 09:17:06 am
You can monitor the current with a current sensor.

Is that what the current sensors built into an L298 are for? I imagine so- are they easy to use?

Edit.... that rang a bell and I uncovered this thread which describes the use of the 298's current sensors.
815  Using Arduino / LEDs and Multiplexing / Re: 74HC595 causes LED'S TO flash when arduino starts up on: June 12, 2014, 09:08:46 am
SPI can be used with HC595, makes for nice fast transfers:

Interesting, thanks.
816  Using Arduino / LEDs and Multiplexing / Re: 74HC595 causes LED'S TO flash when arduino starts up on: June 12, 2014, 08:32:32 am
Which is pin 10 on the shift regsisters? I'm using them in non-spi mode as I'm using them with a Ethernet shield.

Is an HC595 SPI?
817  Using Arduino / Project Guidance / Re: i need help for my graduation project on: June 12, 2014, 04:33:05 am
Have you done any work on this so far yourself?- apart from buying stuff.

Have you for example:

  • Read up on the Arduino boards' capabilities and programming language?
  • Investigated various sensor's capabilities (eg range, ability to work in outdoor light), and their compatibility to Arduino
  • Investigated how to interface those sensors to Arduino
  • Investigated how to interface anything to the motors?
  • Maybe considered making a mock-up model with a small robot chassis and small sensors and low-power motors just to test some ideas
You're almost an engineer... so do some engineering.

PS... the help you will get here will certainly not be a solution. You'll get help where you get stuck on specifics.

818  Using Arduino / Project Guidance / Re: i need help for my graduation project on: June 12, 2014, 02:54:01 am
asking for solution is not the way.


.... especially when the project relates directly to your major. Sometimes students in say art ask for help, and I can sympathise with that when they have no clue how to get their art to move, or make a noise, or flash lights or whatever.

You request is like a final year civil engineering student asking a civil engineering forum how to design a beam. Even if you've never learned Arduino as such in the degree, you should be able to grab its documentation (and you're already on the right site for that), scour the component makers/suppliers for various sensors, and figure this out for yourself.



819  Using Arduino / Installation & Troubleshooting / Re: Arduino Nano Pin Not Supplying 5V / Not Triggering Relay on: June 11, 2014, 09:37:03 pm
Sounds like you have the relay straight into the Arduino? When Crossroads said load, I think he was getting at current. A relay should be controlled by a transistor,  along the lines of this tutorial
820  Using Arduino / Installation & Troubleshooting / Re: My Arduino Uno L LED light keeps flashing orange HELP PLEASE? on: June 10, 2014, 10:49:48 am
OK cool but how? i cannot attach a pic onto this chat?

Click Additional Options... below the box where you type.
821  Using Arduino / Installation & Troubleshooting / Re: My Arduino Uno L LED light keeps flashing orange HELP PLEASE? on: June 10, 2014, 08:43:14 am
Sorry, I have no idea, other than to think the board may be faulty in some way....
822  Using Arduino / Installation & Troubleshooting / Re: My Arduino Uno L LED light keeps flashing orange HELP PLEASE? on: June 10, 2014, 08:29:49 am
If the other code isn't working, but the led is still flashing, seems to me that the new code didn't actually load. Did it say it had finished successfully?

Try something like this, just to see if new codes are uploading properly. This should just make the led stop.

Code:
void setup() {
 
  // do nothing except force 13 led off
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);

}

void loop() {
 
}
823  Using Arduino / Motors, Mechanics, and Power / Re: Where to look for sumo bot tutorials on: June 10, 2014, 07:55:15 am
Unless you're planning to build the chassis from scratch, you might like to look at Pololu's Zumo, which is a mini-sumo.
824  Using Arduino / Programming Questions / Re: Problems after pressing reset button on: June 10, 2014, 07:47:26 am
Does your servo have its own power supply, not fed from Arduino? (Although that won't explain why it worked before you pressed reset.)
825  Using Arduino / LEDs and Multiplexing / Re: 74HC595 causes LED'S TO flash when arduino starts up on: June 10, 2014, 06:06:11 am
I can't find the thread unfort, I may be talking total crap, but yeah give it a whirl
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