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Using Arduino / General Electronics / Re: My serious fail with ribbon cable
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on: May 18, 2013, 12:06:41 pm
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related note:
on a ribbion cable, you have a lot of capacative coupling wire to wire,
thats why half the pins are joined, to ground, so alternate conductors are ground, and alternat conductors are signal.
I've seen -5 v spikes coming out of 1 m of ribbion cable with insufficient earths, when the input is only + 5 volts .
its the edges.
oh BTW: the above blew the receiver circuit. the reason was that the pin numbering on the cable / schematic was wrong, so instead of alternate conductors in the ribbion being ground, 40 wires on the left were earth, the 40 on the right were signal !!
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Topics / Home Automation and Networked Objects / Mains Controller? DMX ?
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on: May 17, 2013, 09:21:20 am
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Its just a thought
can I bounce the thought here.
the old question, controlling mains loads, such as heaters, with spare PV power.
Now I dont like playing with mains voltages, and I know the wife would be happier if I did not have a home brewed mains controler.
SO looking back a few years, I used to work in the theater, and we had remote controlled lamp dimmers, controlled over DMX, which is a differential low voltage system ,
We have DMX shields already in existence, and a 4 channel , 10 amp per channel DMX dimmer costs less than 100 Euro,
so thought was, use an Arduino with a DMX shield to control the dimmers, the arduino also receiving info from something like the EmonTx, Any thoughts on would this be usefull to any one else , is it a good idea or mad ?
Ta
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Development / Other Hardware Development / Re: The Black Diamond, a new Arduino Due workalike
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on: May 13, 2013, 02:11:29 pm
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would really like to see a eprom / flash interface so that as the user above says, constants can be stored.
Even a one wire interface for constants would be great. how do I store a MAC address, or calibration data that I've spent ages setting up....
I can, but others might not want to use VHDL / verilog to configure the Lattic device.
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Development / Suggestions for the Arduino Project / Re: Bit by SoftwareSerial
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on: February 03, 2013, 02:13:47 pm
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I would make a few comments.
software serial was made I understand to add extra serial ports to a device that had not sufficient. I certainly used it to provide a 5th port on the mega when the design called for one.
I have also used it to give me multiple outputs on a design I needed, wit h no inputs. the -1 was added about that time, may be a year or so ago me thinks, but could be out there.
I think software serial was around before the mega, so was not as such designed for it, or not for it. its there if needed.
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Development / Suggestions for the Arduino Project / Re: Bit by SoftwareSerial
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on: February 03, 2013, 03:20:34 am
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Hi
this is not an answer, more sympathy.
I bumped into the same problem with software serial on the mega, in that I'd wired the serial port on software serial to pins that did not support interupts.
qQED : it did not work, I had to move the pins to one of those that does support interrupts on input and software serial worked,
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Development / Other Software Development / Re: SoftwareSerial magic numbers
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on: January 04, 2013, 03:21:48 am
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robtillaart
like the idea of a formula, but could be slow to change baud rate could it not.
not certain, and for interest, did you try two boards connected using the standard software serial code, did you try two boards using the standard hardware uart.
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