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211  Community / Gigs and Collaborations / Re: PCB dESIGN SERVICE on: May 21, 2012, 02:13:58 am
hi,
abrookfield, im after someone to code a little program to interface with a sensor to monitor current thats it really
212  Community / Gigs and Collaborations / Re: PCB dESIGN SERVICE on: May 17, 2012, 02:15:18 pm
round board anyone? my breakout board surface mount components on the bottom of the board, just add 5v



213  Community / Gigs and Collaborations / Re: Looking for someone to make changes/edits to an existing schematic/pcb on: May 17, 2012, 12:53:25 pm
hi,
ive sent you my email, can send you a more info.
i noticed youve made a home brew breakout board, ive got one using smd components just add regulated +5v, the bottom one is the best as you can connect to every pin.


214  Community / Gigs and Collaborations / Re: Looking for someone to make changes/edits to an existing schematic/pcb on: May 17, 2012, 12:27:09 pm
its quit simple, im trying to read a transducer, take a reading from it, if the level falls below a level alarm goes off.
215  Community / Gigs and Collaborations / Re: Looking for someone to make changes/edits to an existing schematic/pcb on: May 17, 2012, 12:08:39 pm
i can do this design/edit/smd components any board size,  right down to supplying gerber files for pcb manufacturing, but in return i would like some programming done for a simple task.

did you see my PCB dESIGN  post a few of my pcbs.

http://arduino.cc/forum/index.php/topic,104885.0.html
216  Using Arduino / Sensors / Re: current monitoring on: May 13, 2012, 04:05:08 am
thanks for sharing your knowlage doc, really appreciate it as i said i wouldnt be able to solve my problem using code so my aim was to solve it using components im going to try to use a comparator circuit to do this.
thank you
217  Using Arduino / Sensors / Re: current monitoring on: May 12, 2012, 12:09:05 pm
hi doc
many thanks on your input really appreciate it, for my purpose im really not looking for very accurate current readings, all im interested in is if the current falls below the pre-set level then i loose my low input then alarm,   
 
im going to knock up a board in the next couple of days puts some loads on it and have a play.

could you please expain a bit more on what you mean by "output ground reference" i dont quite understand that

thank you
218  Using Arduino / Sensors / Re: current monitoring on: May 12, 2012, 10:52:27 am
hi doc
the LT in my diagram is the transducer im using LTSR-25, its output is 2.5v to 4.5v.

im asuming  2.5v at min current 0.001a and 4.5 at max current 25amps. thats the range of the transducer.

yes sorry i should have said , the input is in my sketch has internal pull up resistor, when a low is present an i get an output to an alarm.

thank you
219  Using Arduino / Sensors / current monitoring on: May 12, 2012, 04:22:21 am
hi,
on my current project im trying to monitor two motors using transducers what im trying to achieve is this, if the motor fails i loose a 0v to my ic. alarm sounds.

data sheet of tranducer.
http://docs-europe.electrocomponents.com/webdocs/06c4/0900766b806c43de.pdf


the way im trying to so it is this, set the motor to its lowest speed setting then use a trimming pot to adjust when the transistor turns on at the lowest speed setting, then if the motor fails and goes below the pre-set level i loose my 0v to my ic.



just wondering if this is going to be a very accurate way to achieve this or is there another more accurate way i could do this, (id really struggle to program this obviously this would be the best way)

thank you

220  Community / Gigs and Collaborations / Re: PCB dESIGN SERVICE on: May 07, 2012, 03:39:19 pm
a few more...
221  Community / Gigs and Collaborations / PCB dESIGN SERVICE on: May 07, 2012, 03:22:37 pm
do you want a board layed out?

then maby we could help each other. What im offering is a board layed out with lifelong support and endless editing, im looking for the same but in code please contact me if you are interested.
a few examples of my work.
222  Community / Gigs and Collaborations / Re: Looking for a pcb developer (easy project) on: May 07, 2012, 02:08:45 pm
ok maby a trade, i will lay out your board for some programming?
223  Community / Gigs and Collaborations / Re: Engineer needed for custom PCB project on: May 07, 2012, 01:43:40 pm
the board is a simple exercise, i may be able to help. The challenging part is the metal enclosure that clamps the battery that part will have to be made by a precision / engineer / fabricator.  
224  Using Arduino / General Electronics / Re: how to switch contactors? on: May 07, 2012, 08:16:14 am
well i soppose my skills arnt that limited, for my second project i want to monitor the temp of a room and when temp rises turn on two frequenct drives / fans anything up to 20a 3 phase,  so it has to be a contractor really.

i suppose my simplest option would be mosfet and 5v relay but a bit worried about the noise of the relay, really kicking myself as ive been inside and repaired a million control panels (lift industry) and never really had to know what was switching on relays/contactors but since ive got interested in processors would have been nice to know what different manufactures were using.
225  Using Arduino / General Electronics / Re: Opto & MOSFET - Can someone double-check this for me? on: May 07, 2012, 08:04:05 am
http://www.expresspcb.com/expresspcbhtm/Free_schematic_software.htm

download this for schematic diagram software its very easy to use once you get the hang of it
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