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1  Using Arduino / General Electronics / Re: Need help on high energy CDI (capacitive discharge ignition) on: April 22, 2014, 05:13:18 pm
Hi, 1 to 5 Hz, won't work, the 3845 has to run at high frequency.
Google how a switchmode power supply works, the high frequency is used for efficiency and if you need more energy you are going to need efficiency.
The thyristor can be switched at 1 to 5 Hz no problem, it will give the dc-dc time to charge the cap.

Tom...... smiley
2  Using Arduino / Programming Questions / 3.88014 on: April 22, 2014, 05:04:58 pm
Hi,
Quote
Re: help me plzz
Does not tell us what you are needing help for, please edit the subject to something like;

Help, servo control by Ethernet.

That way you will probably get someone who can help you, all the forum members do not read all the posted requests, you have to let them know in the subject of your request what you need.
If you look at the subject of other posts, there is a lot of space for you to write your request.

Tom...... smiley
3  Using Arduino / General Electronics / Re: PT1000 and Callendar-Van Dusen Equation question on: April 22, 2014, 05:23:08 am
Hi here is a table to check your results with.

http://www.solarhotusa.com/products/controls/files/Resistor-table-Pt1000.pdf

I used the equation in a spread sheet and it works fine.
Do your calculations step by step.

Tom........ smiley
4  Using Arduino / Project Guidance / Re: lm35 temperature sensor problem? on: April 22, 2014, 03:29:45 am
Hi, have you read the data sheet and its suggested applications, I suggest you measure the output of the sensor  with a DMM until you get acceptable readings.

Also in the top of this page is a "Search the Arduino Forum"

try     "LM35"     search and see what comes back, you are not the only one using this device.

Tom...... smiley
5  Using Arduino / Project Guidance / Re: Electronically controlled lock. on: April 22, 2014, 03:19:03 am
Hi, I would suggest you do not toggle a safety switch on and off, they are designed to be either on or off and physically indicate that condition.
A toggle action will not physically indicate this. Especially if you remote control it.
What is the safety switch for and how do you want to operate it?

Tom...... smiley
6  Using Arduino / Project Guidance / Re: Advice on board schematic. Missing anything, capacitor types, and suggestions? on: April 21, 2014, 04:45:20 pm
Hi, good start to CAD drawing, just a suggestion do not be afraid to spread out your diagram.
That way your PIn1 and GATE flags can be eliminated, also put all your GND symbols vertical, try to get  your text all horizontal if possible.
I think as you use eagle,(don't use it myself unless really needed) you will find all the fine tuning points, I'm sure there is a font and points parameter for the component text to make it smaller.

Keep practicing.  Tom...... smiley

7  Using Arduino / Project Guidance / Re: Problem Controlling Multiple Ping Sensors with Servos on: April 21, 2014, 04:26:35 pm
Hi, we need a posting of your sketch, using # code tags, to see how you command your motors.
Also a circuit diagram of your project in CAD or hand drawn in pdf, jpg or png format.

If you have any delays in your sketch, that will cause your ping pauses.
You would need to look at blink without delay in the IDE example to get around this.

Tom.... smiley
8  Using Arduino / General Electronics / Re: blackout circuit - 300ma cc circuit on: April 21, 2014, 04:14:06 pm
Hi.
What does the 5V source represent?
What does the 14.5V source represent?
Where is the load?
Show me a circuit please with batteries , your actual power source, your actual load.

Sorry, but simulations are like working things out in your mind/brain, put them into practice and find all the things that you didn't think of, wasn't put in the simulation.

When you are looking at uA, even tolerance of components will probably upset calculations.

Tom....... smiley
oops sorry  [soapbox] [/soapbox] (damn got to remember to take the effort to use the soapbox tags.)
9  Community / Bar Sport / Re: Maplin UK. on: April 21, 2014, 03:48:22 am
Hi, for what the internet can provide you certainly have to search for bargain and deals.

Most of my supplies come from RS (free next day courier, 9.00AM), or E14 (farnell)(Courier sachel free if order over $50), and just down the road, like 5mins, Wiltronics who have Arduino, and good supply of components, and online shopping.
If there is no hurry, I'll got to ebay, I always do a   search  "arduino" and look at Auction with free postage.
Surprising what you will eventually end up with.

Tom..... smiley
10  Using Arduino / General Electronics / Re: Hi all need suggestion on: April 21, 2014, 03:21:44 am
Hi.
The Voltage into the DC-DC will be   24V(RMS) x 1.414= 33.9Vdc
Check to see if the converter will withstand that, also because the 24V is rated at 14Amps, with 3A load the 24V will be higher.
That is more than 33.9Vdc input.
The max input is 45Vdc.
http://www.ti.com/lit/ds/symlink/lm2596.pdf

Tom........ smiley
11  Using Arduino / General Electronics / Re: blackout circuit - 300ma cc circuit on: April 21, 2014, 03:03:06 am
Hi, have you built the circuit?
If all you are relying on is a computer simulation, sorry nothing like the real thing.

I presume you have a load powered by 12v derived from the mains supply, it is also charging the battery.
If the load current is not too high, just use diode switching to keep battery power applied.
Please a REAL circuit diagram please, not the simulata one. Show battery and supply and load.

Tom..... smiley
12  Using Arduino / General Electronics / Re: Regulating DC Voltage on: April 21, 2014, 02:35:52 am
Quote
Dimensions:
Length: 65 mm (2.56")
Diameter: 18 mm (0.71")
Weight: 46.5 g (1.64 Oz)

From first spec link.

Tom..... smiley
13  Using Arduino / General Electronics / Re: custom pcb on: April 21, 2014, 02:25:10 am
Hi, how complex is the circuit, do you need a custom PCB?
Have you thought of:

http://www.ebay.com.au/bhp/veroboard

Also available at most electronic suppliers.

Tom...... smiley
14  Using Arduino / Programming Questions / Re: Number Conversion on: April 20, 2014, 10:23:32 pm
Hi, can you please read this  thread and then post your sketch in # code tags, this will make it easier to read, also post the complete sketch so we can see how you have defined variables and libraries.

http://forum.arduino.cc/index.php?topic=149014.0

Hope to help.. Tom....... smiley
15  Using Arduino / Programming Questions / Re: if not working on: April 20, 2014, 10:06:47 pm
Hi, good to see you had success with your project, now can you repost your sketch after reading this link please.

http://forum.arduino.cc/index.php?topic=149014.0

Please post using   # code tags.

Thank you .Tom..... smiley
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