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1  Using Arduino / Motors, Mechanics, and Power / Re: 3 phase hybrid stepping motor on: April 20, 2012, 09:44:31 pm
Check out page 9 of this pdf on sensorless motor control for three phase motors too.

"It is possible to determine when to commutate the
motor drive voltages by sensing the back EMF voltage
on an undriven motor terminal during one of the drive
-Ward Brown
2  Using Arduino / Motors, Mechanics, and Power / Re: 3 phase hybrid stepping motor on: April 20, 2012, 02:38:46 pm
This is a very informative blog about 3 phase motor and controllers. This guy also has some interesting things to say about sensorless motor control if it helps.
3  Using Arduino / Motors, Mechanics, and Power / Re: Controlling Segway Generation I motors on: April 19, 2012, 07:46:33 am
Yea I remember that too. Not sure how that redundancy scenario would work with this motor. There doesn't seem to be anything mysterious about this motor-I've applied 12 volts to one of the six coils and the motor twitched hard, went to a certain position and stayed there. Then I applied 12volts to the opposite coil and the shaft was energized but didn't move. All seems normal. I just new to drive the motor given what I know now though.
4  Using Arduino / Motors, Mechanics, and Power / Controlling Segway Generation I motors on: April 19, 2012, 07:14:56 am
I have two segway generation 1 motors I'd like to control with an arduino Uno, Mega, Pro-mini whatever. I know a little about motor controllers (OSMC motor controllers and Syren 50A motor controllers).
I'm having trouble identifying them first off. These motors have six magnets/coils each so are these 3 phase DC motors or 6 phase? They have six hall effect sensors as well for feedback. The next step would be to find a motor controller I could drive these with.

the motor itself

the back of the motor with circuit board off

the circuit board with hall effect sensors

after continuity test with ohm meter I found the magnets apply to which nodes

i think these are 3 phase stepper motors but not sure. I would like to find a motor driver to buy but not totally against building my own if there's a schematic. Any help appreciated.
5  Using Arduino / Sensors / Re: Guide to gyro and accelerometer with Arduino including Kalman filtering on: May 16, 2011, 01:07:38 pm
where's the code?
6  Forum 2005-2010 (read only) / Portugues / Re: external power supply - maximum input current on: September 21, 2010, 09:54:47 am
Would an extreme 12V, 4.5A power source be ok or would the onboard arduino voltage regulator fry?
7  Forum 2005-2010 (read only) / Troubleshooting / Re: avrdude error on: December 19, 2009, 11:24:41 pm
I'm having verification errors with my Duemilanove Arduino Board.  After attempting to upload any program it states:

avrdude:verification error, first mismatch at byte 0x0002 0x61 !=0x62
avrdude: verification error; content mismatch

Have tried different computers and platforms, usb cables, power supplys, reset button but still nothing, it seems that the last successful upload is still active inside the board.

Many people are saying that they're finding the atmega328p chip to be faulty. I can buy an atmega328p but will I have to flash it prior to installing on the duemilanove? Can't the duemil. flash it? How is this done?
Any info much apprec.
8  Forum 2005-2010 (read only) / Troubleshooting / Re: Relays turn on, then shows garbage in LCD on: September 21, 2010, 07:57:14 am
Great I'll try the rc snubber. thanks.
9  Forum 2005-2010 (read only) / Troubleshooting / Same prob Re:Relays turn on, then shows garbage in LCD on: September 18, 2010, 12:41:44 pm
I'm having the same problem. My LCD flickers and sometimes even shows the sparkfun logo meaning it has shutoff or reset. It seems that I need to take more precaution in my setup to prevent a surge of current or voltage from the relay when it closes or opens. But I'm not sure how to go about this. Everything else works like I want it to except for this surge of current.  I have re-soldered this relay circuit three times now even trying two IN4004 diodes in parallel, using other relays, etc... This project has to be solid. I want to add another relay to it to control something else but am afraid it will double the frustration...

 I have an arduino Duem with a Serial LCD-09394. I have two TMP36 temperature sensors coming in on analog(0) and analog(1). I have a 5A, 12V relay and 2N4401 transistor WITH 1N4004 diode setup just like this however my relay circuit is opening and closing an 120V ASCO water valve.

My schematic is here:

My program is here: please know that I am no programmer. not even really sure how to add code to this forum, guess I'll copy it to notepad and put it on a website:

To be clear, my question is: First of all, is my relay circuit surging the arduino or LCD? If so, how can I protect them better?

BTW, I do have a solid state 25A 120V Crydom relay that inputs 3V to 32V. It has each node labeled (1) through (4), check the picture.

I couldn't get it to work though. I had a negative from arduino to the negative on relay(4), positive from digitalout on arduino to positive on relay(3), and i'm assuming (1) and (2) become closed when arudino sends a 5V to (3). but it no worky. any suggestions as I think this relay would be better.

10  Forum 2005-2010 (read only) / Interfacing / Re: Arduino and xbee's on: February 03, 2010, 03:38:47 pm
Does the Arduino board with built-in bluetooth module allow wireless uploading of code or do we hit the reset obstacle with this one too:-?
11  Forum 2005-2010 (read only) / Interfacing / Arduino and xbee's on: February 02, 2010, 09:32:46 pm
Recently I've purchased two xbee boards, both XB24's with function set XBEE 802.15.4-Version 10E6, a Duemilanove with an xbee sheild, and an xbee usb explorer. I've configured the xbee's through X-CTU and have typed and uploaded some simple Serial transmit code to the Arduino using the usb cable to check the communication between the (xbee + usb explorer) and the (arduino + xbee shield + xbee + usb cable)and it works. But all I'm able to do is view and watch the X-CTU terminal as a Serial debugger.

My question is: can I write code and upload it wirelessly to the arduino?-all the tutorials stop at this point and I'm lost. Can't I unplug the usb cable from the arduino and upload code from the computer through the (usb explorer + xbee) and then wirelessly to the (arduino + xbee + shield + power source)? I can view the terminal recieving the serial commands but this is it.
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