Show Posts
Pages: 1 ... 37 38 [39] 40 41 ... 302
571  Using Arduino / General Electronics / Re: Eagle libraries on: July 27, 2014, 04:21:49 am
Thanks- let me give that a whirl
572  Using Arduino / Programming Questions / Re: Real Time Clock Set-up on: July 27, 2014, 02:29:07 am
There's a SetTime example with that library you're using: it sets the time to the time you compiled the sketch.
573  Using Arduino / General Electronics / Eagle libraries on: July 27, 2014, 01:24:57 am
This might not be in the right forum board....

I'm new to using Eagle and so far getting along ok.

That said: is there a way of copying often used symbols from the standard and imported libraries (like SparkFun's) into my own "mini"-library to make them more readily accessible?

What I see of the libraries so far is to create a new one and make new elements: can't see how to bring in an existing element.
574  Using Arduino / Motors, Mechanics, and Power / Re: Proper battery Freaduino / Servo motors on: July 26, 2014, 11:49:56 pm
So with a 9v battery for the Arduino, and 6V battery for both Servos will be fine...

  • If by 9V battery you mean a PP3, they are notorious for not lasting very long. You might be better with a bunch of AAs
  • 6V supply to servo needs to provide enough current remember: as CR says maybe allow 1A at stall. I got over 500mA on some tests I did a while back.
575  Using Arduino / Project Guidance / Re: Real Time Clock on: July 26, 2014, 11:42:38 pm
It might be that the crystal (which is presumably of the correct frequency) does not have the correct capacitance as required by the 1307.
576  Community / Website and Forum / Unread posts not showing on: July 26, 2014, 11:33:39 pm
I seldom click to mark all posts as read. Lately I've noticed it seems to be happening by itself and I'll be down to only a few unread posts when a while before there where pages and pages.

 smiley-mad
577  Using Arduino / Project Guidance / Re: Making car window roll automatically using an ATtiny85 on: July 26, 2014, 11:29:38 pm
Quote
for a car I'm restoring customising.
578  Using Arduino / Installation & Troubleshooting / Re: Arduino Uno R3: What is the maximum output amperage? (Without damaging board) on: July 26, 2014, 11:26:22 pm
The neopixel are powered from the 5V header pin, yes? They only receive signal from the 328P, so no damage there. Kinda surprised you didn't smoke the 5V regulator, which is only rated for 800mA.

That was going to be my question: assuming the LEDs are only controlled, not powered, by the I/O, what current can the board supply at the 5V pin.... the OP seems an order of magnitude over the allowable so that regulator must be glowing.
579  Using Arduino / Project Guidance / Re: Using Aruino Digital pins after putting on a motor shield on: July 26, 2014, 01:50:24 pm
They mean you can use both pairs of output to drive one motor, thus doubling the capacity.

But I only posted that as an example, because I've used it.... have a look around Pololu and see what else they have, to check there's enough current available.

And no, in general you only need two pins: a H/L from Arduino to the motor chip will output a H/L and thus "forward", while a L/H will drive the motor in "reverse".
580  Using Arduino / General Electronics / Re: IR Led and Phototransistor connection give always 0 value on: July 26, 2014, 01:43:38 pm
Have a look at http://arduino.cc/en/Tutorial/ButtonStateChange and use the idea of having the "old" status replaced by the "new" one. Then next time through, it compares the new, new one with the old and only acts if they differ.
581  Using Arduino / General Electronics / Re: IR Led and Phototransistor connection give always 0 value on: July 26, 2014, 01:32:05 pm
If it's counting too many, it may be that the loop is going too fast for the falling grain. By the time the loop goes again, the grain is still there so it thinks it's a new one.

So you should perhaps  use a state check to see if the sensor is still blocked, ie see if it has gone from clear to blocked. If it's blocked now, and was blocked before, it's not a new bead. If it's blocked now and was clear before, it's a new one.
582  Using Arduino / Project Guidance / Re: Using Aruino Digital pins after putting on a motor shield on: July 26, 2014, 01:15:02 pm
What you say is true Twogan, for some shields.

But look at the pic in the link in the OP's first post. That shield brings the pins out in Grove connectors, making it not as simple a matter of just jamming a wire into a hole.

In general though, pins not used by a shield are indeed available for use, just that in this case the connection is a bit more tricky.
583  Using Arduino / Project Guidance / Re: Using Aruino Digital pins after putting on a motor shield on: July 26, 2014, 12:56:33 pm
As a matter of modern-day-principle you should look away from a motor driver board (shield or otherwise) that uses the L298 chip and look towards (for example) something like this. Far more efficient (the 298 drops at least 2V, up to 4+ iirc at high current), much smaller footprint, and doesn't need a heatsink the size of an elephant.
584  Using Arduino / Project Guidance / Re: Is 5.5volts from external regulator to Vin pin enough?? on: July 26, 2014, 12:27:58 pm
But why are you limited to the converter you mentioned in your opening post?

There are loads of others, like these at Pololu.
585  Using Arduino / Motors, Mechanics, and Power / Re: Proper battery Freaduino / Servo motors on: July 26, 2014, 11:33:40 am
Quote
6V x 2 servos =12V

No, 2 servos would be connected to the power source in parallel, so still 6V.

edit: pic attached
Pages: 1 ... 37 38 [39] 40 41 ... 302