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1  Using Arduino / Project Guidance / Re: Transformers on: September 18, 2014, 09:20:12 pm
Hi, do you need 15kV  AC or DC and what will it be supplying current to?
Also how much current?

Tom.... smiley
2  Community / Bar Sport / Re: Scotland Reveals Currency Plan on: September 18, 2014, 05:10:38 pm

Possible independence for Scotland, is that why our security forces here in Australia have gone on high a-lert?

Tom.... smiley-cool (Spring has sprung, aaacchhhooooooo)
3  Using Arduino / Project Guidance / Re: LEDs say yes, but Input pins say nothing, or too many things?! on: September 18, 2014, 03:18:34 am
Hi, if the detector assembly is the one that you have posted the specification for, PT5529B.

You will note that the detectors are ONE ABOVE THE OTHER, not side by side so you must use the encoder wheel that came with it and ALIGN it precisely to get it to work.

Tom.... smiley
4  Community / Bar Sport / Re: Who hasn't accidentally touched a mains voltage once or twice? on: September 17, 2014, 04:21:20 pm

Quote from: TomGeorge on 17-09-2014, 22:58:04

ps, all touches with the mains are accidental.

Sorry, in MY CASE,   all touches with the mains are accidental.

I use coffee to wake me up in the morning,
With the number of coffee vans and shops in this city, the whole city population should be Lerts.
And ya got to be a Lert these days, especially around electricity.

Tom...... smiley
Sorry its morning here and only 1/2 a cup of java consumed.
5  Community / Bar Sport / Re: Who hasn't accidentally touched a mains voltage once or twice? on: September 17, 2014, 07:58:04 am
Hi, I have been zapped quite few times during my working life, (still am, working that is).
Listens , ker thump, ker thump, ker thump, yep still here.

240Vac used to be  a decent jolt, do many of us more mature zapped forum members recon that a clout from their mains is not as memorable as it used to be.

15kV used to wake you up too.

Tom...... smiley
ps, all touches with the mains are accidental.
6  Community / Exhibition / Gallery / Re: Build Custom Arduino Project. on: September 14, 2014, 09:32:21 pm
Hi shouldn't the LED on digital pin 13 (IC pin 19) have current limit resistor?

Without resistor what limits current for output?
Pin 13 cannot be used for anything because it is clamped by the LED volt drop.

Tom.... smiley
7  Using Arduino / Motors, Mechanics, and Power / Re: Which h bridge circuit is more suitable for my dc motor. on: September 14, 2014, 03:28:01 am
Hi, no you will have 5 connections, don't forget arduino gnd to driver IC gnd.

Tom..... smiley
8  Using Arduino / Project Guidance / Re: relay module control via software on: September 13, 2014, 10:44:41 pm
Hi, I gather you want a program to make an application to run on your pc to talk to the arduino through the usb port.
google   processing, it wil come up with a site Processing . org  . It is an open source ide, similar to arduino ide, but for windows.
Arduino and Processing will talk to each other, there are exaples of even what you are wanting to accomplish.

Tom.......... smiley
From android tab3
9  Community / Bar Sport / Re: IE11 on: September 13, 2014, 02:30:10 am
Hi, I had to think IE11????   So long since I used it.
Chrome here, The PC magazines used to always include copy of IE, but now they don't, they have no confidence in the product at all.

Tom...... smiley
10  Using Arduino / General Electronics / Re: measuring current with a scope on: September 13, 2014, 02:09:04 am
Hi, what is the driver that you are using?

Tom...... smiley
11  Using Arduino / General Electronics / Re: Amateur Spectrum Analyzer on: September 12, 2014, 04:15:15 am
Hi, what frequencies?

Tom..... smiley
12  Using Arduino / General Electronics / Re: Current sensing: shunt by parallelism on: September 12, 2014, 04:10:18 am
Hi, I agree with MarkT, the principle is sound.

However the shunt of 4.85ohms with 500mA will cause a drop of 4.86 x .5 = 2.43 volts. which is significant if you are in a 5, 12 or 15V circuit.

The aim is to have as small a drop as possible, hence MarkT suggestion of small shunt value and amplify the dropped voltage with an instrumentation or differential amplifier.

Tom... smiley
13  Using Arduino / Project Guidance / Re: General Load Cell Setup And Questions on: September 12, 2014, 03:13:20 am
Hi, from repairing instrument amps associated with load cells, they usually are setup pre-loaded.

In your case it looks like 1kg pre load, call that zero and load from there.

Because you are measuring deflection/stress in a cantilever, the fixed point and  the position of the load will be important.

In a set of scales they use a platter on a knife edge or pin support on the cell so that the load, not matter how big its base, is applied at the same point of the cell.
As in  your picture the load is distributed over the base of the sample, if you move it in or out along the cell the weight indication will change.

Tom...... smiley
PS, turn the load cell around, the down arrow should be at the load end.
14  Using Arduino / General Electronics / Re: Why my arduino just give 1,2VDC on digital pin on: September 11, 2014, 09:43:01 pm
Hi, can you post a picture of your project showing us how it is connected, and the pins on the digital display.

I have compiled your sketch and it compiles but to try it out we need a full circuit diagram to follow.

Your hand drawn attempt tends to show that you have 4 individual 7 segment displays not a 4 digit 7segment display.

Tom..... smiley
15  Using Arduino / Motors, Mechanics, and Power / Re: Which h bridge circuit is more suitable for my dc motor. on: September 11, 2014, 03:45:10 am
Hi, again, diodes fitted like in the accompanying pic.

Tom.... smiley
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