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1  Using Arduino / Motors, Mechanics, and Power / Re: Parallel power supplies on: July 08, 2011, 03:25:45 am
Thanks for the replies.
The parallel connection is the wrong approach, I was thinking about it wrong.
I am using two power supplies as that is what I was given to use, so I don't have the option to buy another single supply(would save a lot of trouble!).

What I actually want to do is split the load between the two supplies and connect the grounds together.

The project is actually an 8x8 array of ShiftBrite LED's connected to a sensor board. I can use one of the supplies to power the LED array and the other to power the sensor board and control logic.

Also how do I ensure that failure of either supply does not cause my circuit to overload the remaining supply?

Cheers guys,

Jon



2  Using Arduino / Motors, Mechanics, and Power / Parallel power supplies on: July 07, 2011, 03:52:31 am
Hey guys,

I need to connect together two power supplies in parallel for more current output. The power supplies are XP Power: ECM40US09, they are rated at 9V 4.5Amps. If someone could check them out and give me a heads up would be great! Im assuming I just need to parallel connect the positive and negative terminals.

I want to enclose the pair inside a box, with an input lead from 240V AC and a two wire(+ -) output with an on/off switch. So basically making it a 9VDC power supply capable of supplying up to 9A. Is it as simple as adding a switch and terminals onto an enclosure or do I need to add some protection circuitry?

Cheers,

Jon.
3  Using Arduino / Sensors / Re: Multiple sensor outputs through 1 line?? on: June 22, 2011, 04:33:41 am
The sensor arrangement is simply and IR emitter / photo-transistor pair and I am reading an analogue value from the transistor.
The emitter is a TSAL4400 and the transistor is TEFT4300. Easier to smack that into google and grab the info.

Cheers!
Jon.
4  Using Arduino / Sensors / Multiple sensor outputs through 1 line?? on: June 22, 2011, 04:15:49 am
Hey guys,

I am making an 8x8 array of IR sensors and want to scan over them in a keyboard arrangement. So basically I want to power up the rows one at a time and check the value of each sensor in the row (column values). Doing this quickly allows me to check over the whole array and require only a small amount of driving current.

I am controlling the power to the array using the arduino and a 4051 demux connected to 8 transistors feeding in 5V. The part I am a little confused about is how to connect the output of 8 sensors (one row) into one input of a 4051 mux.

I want to have simply 8 inputs and 8 outputs from the array. The inputs is easy but is it possible to tie the output of 8 sensors to one input? Bearing in mind that only 1 of the 8 sensors will be powered on.

I hope I have explained what I am trying to achieve.

Any help would be great.
Cheers,

Jon.
5  Forum 2005-2010 (read only) / Interfacing / Using eclipse(java) with the Arduino on: September 08, 2010, 04:48:15 am
Hi guys,

I am currently undertaking a project at uni that involves using an Arduino.

The Arduino will be controlling some blinkM led modules.

As part of the project I want to build a GUI to interact with the board.
I have a pretty good knowledge of java and want to use the Eclipse IDE.

Does anyone know of a tutorial or have experience talking with the Arduino through Eclipse?

Thanks in advance.

Jon.
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