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1  Using Arduino / Programming Questions / Turning on pins for varying amounts of time on: April 03, 2012, 01:23:20 pm
I have 8 pins connected to 8 solenoids and I need to turn them all on and after a brief delay off again at regular intervals. The problem is that each one of the pins needs to be for a different amount of time because of variables in the hardware. That is to say, that they will on turn on at the same time but will turn off one at time at different intervals

How can I do this with an arduino?

2  Using Arduino / Motors, Mechanics, and Power / Re: Can I power arduino with 12 through barrel jack? on: March 29, 2012, 12:25:06 pm
Drat. Well, thanks for the info.

If I splice it, I can just put the power in to Vin and ground pins and it'll run through the voltage regulator, right?
3  Using Arduino / Motors, Mechanics, and Power / Can I power arduino with 12 through barrel jack? on: March 29, 2012, 11:50:19 am
I have a salvaged power supply brick that supplies 5amps of 12 volt power and the barrel plug happens to fit the arduino uno i have. Can I run the arduino on this 24/7?

I also need to power some solenoids with the 12 volts. Can I pull power out of the Vin pin? I have 8 solenoids that each take 350 mA, which I assume means that at times I might be drawing as much as 2.8 amps (.35 amps * 8 solenoids). Can I draw that much through the Vin pin without anything bad happening?
4  Using Arduino / Motors, Mechanics, and Power / Powering arduino and solenoids with 12 volt power supply on: March 27, 2012, 02:24:10 pm
I have a 12 volt 5 amp power supply that I salvaged from an old projector. I have eight 12 volt 350 mA solenoids that I need to power as well as the Arduino Uno. Is there a way I can use this one power supply to power both the arduino and the solenoids? Can I do so and still utilize the barrel power jack on the arduino (because it happens to fit and would be really nice not to have find another part)
5  Using Arduino / Motors, Mechanics, and Power / Re: Controlling many solenoids at once on: March 27, 2012, 01:28:09 pm
Awesome. Thank you for the explanation. What would be the consequence of omitting the  10k resistor between the gate and source? If the solenoid power is on but the arduino off, would this just result in the gate pin "floating" and causing the solenoid to turn on and off randomly?
6  Using Arduino / Motors, Mechanics, and Power / Re: Controlling many solenoids at once on: March 27, 2012, 01:15:05 pm
Thanks for the reply Lefty. The mosfets I am using are indeed 5 volt logic level (This one: http://www.fairchildsemi.com/ds/RF/RFD3055LESM.pdf)

As far as the resistor goes, you are saying to put it inline between the output pin and gate, right? Should the gate pin still be wired to ground?

As in:
Arduino output pin: --------> 100 ohm resistor -------> Mosfet's Gate -----> Ground
7  Using Arduino / Motors, Mechanics, and Power / Controlling many solenoids at once on: March 27, 2012, 12:43:44 pm
I am about to build a bubble display thing that needs to control many solenoids (right now just 8, but possibly more later). I think I understand it, but I want to make sure the circuit I am about to put together isnt flawed and won't destroy any of the parts. The solenoids are of the 350mA 12 volt variety. I have attached an image of the circuit I have in mind. Basically I have an output pin from an Arduino Uno running to the gate pin of a MOSFET and from there through a 100 ohm resister to ground. I have a separate 12 volt 5 amp power supply that I salvaged from an old projector. I have its ground line tied to the Arduino. The power line runs out of the 12 volt supply and into one side of the solenoid. The other side of the solenoid is connected to the Drain pin of the mosfet. The source pin of the mosfet is then ran to ground.

Is this the right way to control a solenoid? Will this work once I have 8 solenoids hooked up in the same way to the Arduino? Most of the time only a few of the solenoids will be on a time, but sometimes they will all need to be open.

8  Using Arduino / Networking, Protocols, and Devices / Re: Reuse HP RSVLD 0707 Atheros Wifi card ? on: March 07, 2012, 09:42:21 am
I also just salvaged one of these and am looking for info on it.
9  Using Arduino / Programming Questions / Re: What is an easy to read image format for the Arduino on: March 02, 2012, 02:23:34 pm
It looks like GIF might be doable if one could work out the LZW decoding
.Raw format looks like what I will be going with.
10  Using Arduino / Programming Questions / Re: What is an easy to read image format for the Arduino on: March 02, 2012, 11:36:41 am
I only need on and off indicators, so the image needs to be 2 color black and white. I want photoshop to be able to generate the images so that our designers or marketing people can create the images themselves without needing to use a special program to convert the images
11  Using Arduino / Programming Questions / Re: What is an easy to read image format for the Arduino on: March 02, 2012, 10:27:05 am
Where its coming from hasnt been determined yet, but it doesn't seem like it matters. If it does, lets say an SD card.

After the text "Bubble Concept" is a youtube video
12  Using Arduino / Programming Questions / What is an easy to read image format for the Arduino on: March 02, 2012, 10:09:55 am
I am building a display of sorts that opens and closes an array of solenoids to create bubbles under water. I need the arduino to be able to read image files to be able to display it. I can come up with a simple custom format for it, but I would prefer a standard format that can be saved from a program like photoshop. The images will be simple black and white. What is a good format for reading from arduino?

Bubble display concept:
13  Using Arduino / Motors, Mechanics, and Power / How to tell if this MOSFET work with this Solenoid on: February 21, 2012, 11:08:28 am
I am trying to figure out if this solenoid:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_169835_-1

will work this MOSFET:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_209058_-1

using a 5v signal from an Arduino.

I am guessing it will because:
It is marked as a Logic Level MOSFET
The gate threshold level is 1.6 which well below 5 volt from the logic pin of the Arduino (Is it too low? will 5 volts from the arduino fry it?)
the mosfet is rated for 10 amp continuous and the solenoid only needs 350mA
the mosfet is rated for 100 volt and the solenoid only needs 12

Am I right that this mosfet will be able to fully drive the solenoid using an output pin from the arduino? If so, is it way overkill? Is there a cheaper mosfet that will work equally well?
14  Using Arduino / Programming Questions / Does arduino have nullable int? on: February 17, 2012, 09:26:01 am
I come from the realm of c# and over there I have nullable value types like int? double? float?. Does arduino have anything like that?
15  Using Arduino / Interfacing w/ Software on the Computer / Re: Does G-Code require interpreter to respond after command? on: February 16, 2012, 07:41:38 pm
Is the XON and XOFF thing generally implemented in professional grade cam software?

I would take what your saying to mean that in standard applications that the interpretor doesn't talk back and just listens for commands. In lieu of that I would assume that it would buffer the commands and act on then as it is ready. Does a standard gcode sending application attempt to space out the commands as it expects to be required, or do they normally just send the whole thing down in one fell swoop?
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