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1  Using Arduino / Project Guidance / Re: RFID Antenna for use with an MFRC522 reader and an Arduino Uno on: December 23, 2011, 11:29:35 am
I have just bought one of these http://www.b2cqshop.com/products/203-rfid-module-kit-1356-mhz-with-tags-spi-w-and-r-for-arduino.aspx
At a guess I would say that the antenna is about 24" when straightened out.
I haven't had time to hook it up yet though.
2  Forum 2005-2010 (read only) / Troubleshooting / Re: Writing directly to ports, now the Diecimila hangs on: October 12, 2008, 07:20:07 am
Am I right in thinking that all beatmaster has to do is press his reset button and he will be able to load a new sketch, thereby restoring his Arduino back to a funtioning unit ?.
3  Forum 2005-2010 (read only) / Bugs & Suggestions / Re: TTY Clear Screen? on: December 22, 2008, 07:46:56 am
Happy days Lefty, happy days. ;D
4  Forum 2005-2010 (read only) / Bugs & Suggestions / Re: TTY Clear Screen? on: December 21, 2008, 12:38:13 pm
Remember Ansii, Heck some of us old 'uns remember paper tape.
5  Forum 2005-2010 (read only) / Interfacing / Re: 8 Bit I/O on: September 19, 2008, 11:04:38 am
Thanks that was quick, I got myself a Sanquino too, so that may be a better board to use for this task, but the method is what I was after, thanks again.

Dave
6  Forum 2005-2010 (read only) / Interfacing / 8 Bit I/O on: September 19, 2008, 09:44:42 am
Is it possible to read or write a whole byte through the ports using Arduino 0011?, I would like to be able to read data from the old 2516 style eproms and display it, and if that works even create a programmer.
7  Forum 2005-2010 (read only) / Troubleshooting / Re: Losing SerialLCD backlight on: November 27, 2009, 09:51:41 am
He's right you know Mike, I have exactly the same display and no resistor is required to be added.
8  Forum 2005-2010 (read only) / Troubleshooting / Re: Possible to burn out Vin on Diecimila? on: September 01, 2008, 06:50:09 am
I don't think a reverse polarity on the power connector should burn out the reg. Diode D1 is directly in line with the input and would be reverse biased so no current will flow.

I would be interested to know what voltage you have on the Vcc line when you connect it up like that, it should be 5volt, but if the reg is shorted it will show the input voltage, for safety leave the header for  power off and measure across C7.
9  Forum 2005-2010 (read only) / Interfacing / Re: switching relays to control 120v fans - problem ?? on: October 23, 2010, 02:06:12 pm
I'm not sure but I think the problem may be that the fan doesn't draw enough current thriugh the SSR, try connecting a light in parallel and see if it works.
10  Forum 2005-2010 (read only) / Interfacing / Re: 12 DC motors 11k help? on: December 12, 2010, 08:07:07 am
Just a thought, won't these motors be limited in torque for safety reasons?, I mean you don't want to chop a kiddies head off.
11  Forum 2005-2010 (read only) / Interfacing / Re: Stepper motor control with potentiometer on: November 27, 2009, 11:18:09 am
Gotcha, looks good, as you suggested a pot could be interpreted by a program to give zero steps at mid point and clockwise /anti clock for either side, hopefully someone more clued up than I can help you with this.
Good luck.
12  Forum 2005-2010 (read only) / Interfacing / Re: Stepper motor control with potentiometer on: November 27, 2009, 11:01:45 am
I don't know to be honest, I only received my first servo to play with the other day and haven't got round to doing anything with it yet, it is heavily geared though so should be quite strong.It was also very cheap (under £5).
Why do you need cotinuous rotation on a camera?.

Any BTW i'm sure what you suggested in your OP is feasable.
13  Forum 2005-2010 (read only) / Interfacing / Re: Stepper motor control with potentiometer on: November 27, 2009, 10:49:55 am
You might try looking at servo motors as an alternative, take a look at this:- .
14  Forum 2005-2010 (read only) / Interfacing / Re: 2 part / 2 stage rotary encoders? on: January 13, 2009, 01:07:52 pm
Shouldn't the course data be on the inner ring and the fine on the outer where there is more room for graduations?.

Many years ago I saw an encoder where the first course wheel drove a second fine wheel, the gearing between the two meaning that the second wheel spun twice as fast.
15  Forum 2005-2010 (read only) / Interfacing / Re: Getting data from a salvaged DC motor on: January 13, 2009, 12:55:15 pm
The toothbrush in question uses a rechargeable Ni-Cad battery that is able to supply more current than an ordinary dry cell, I have just pulled an old one apart to have a look and there appears to be 2 cells in one package giving about 2.4 volts (not sure because it is discharged).

Remember also that the initial current drawn on power up will be much higher than its free running current.

Brum
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