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16  Using Arduino / Project Guidance / Shared I2C devices on: July 12, 2012, 08:02:54 am
Hi,
I intend to link 4 or 5 Arduino's via I2C.
If I add devices such as an I2C RTC onto the same backbone, will each of the Arduino's be able to address the I2C RTC device etc?

Thanks as always,

jB  smiley-cool
17  Using Arduino / Storage / Re: Ethernet Shield SD Card Pins (Mega) ? on: June 19, 2012, 09:33:54 am
Thank you very much...
Kind regards,
jB
18  Using Arduino / Storage / Re: Ethernet Shield SD Card Pins (Mega) ? on: June 18, 2012, 12:18:52 pm
Hi,

Here is an example of what I have got.
Code:
http://www.ebay.co.uk/itm/Ethernet-Shield-W5100-For-Arduino-2009-UNO-Mega-1280-2560-/300695278167?pt=UK_Sound_Vision_Other&hash=item4602d5d257

Thanks

jB  smiley-cool
19  Using Arduino / Storage / Ethernet Shield SD Card Pins (Mega) ? on: June 18, 2012, 07:12:41 am
Hi,

Sorry if this has been asked before.
I have an Ethernet Shield purchased on eBay supposedly Mega compatible.
I am trying to access the SD card to noavail.
The Shield details are:
HanRun HR911105A 10/49 mounted on an Arduino Mega 2560
I tried the standard ReadCardInfo sketch.
Default setting. Generates standard "Is card initialized etc"
Changed pins according to sketch, but still same errors.
Reformatted card to FAT32 still same.
Am using 2GB card.

As these shields are selling like hot cakes on eBay I am hoping someone has the correct pins worked out?
If so any help would be appreciated?

Thanks and kind regards,

jB  smiley-cool
20  Using Arduino / Programming Questions / Re: Software Reset on: June 18, 2012, 05:35:06 am
Thank you.
jB
21  Using Arduino / Programming Questions / Re: Software Reset on: June 17, 2012, 08:22:09 am
Hi,

Thanks for the great responses.

Kind regards,

jB  smiley-cool
22  Using Arduino / Programming Questions / Re: TX / RX etc LEDS on: June 17, 2012, 08:21:43 am
Hi,

Thanks for the great responses.

Kind regards,

jB  smiley-cool
23  Using Arduino / Programming Questions / Re: Software Reset on: June 17, 2012, 06:17:29 am
Humph!!!

I take it I am surrounded by scoundrels & cynics.
I asked as the boards have a reset pin and wondered if I had to use the pin with my own function or whether there was a function or whther someone had already done this.
As to why, I am explorering the capabilities of Arduino before I get into heacy coding.
I want to be able to change ethernet details, IP, GW etc via a web page. The details are held in EEPROM and I assumed as with many devices to get the new ethernet setup working I would have to reset, clearing any program buffers etc. If all I need to do is change IP, DNS, GW etc from a rer-read of the EEPROM then the necessatity for a reset pales at the moment.
Additionally how retentive of memory is an Arduino does it Garbage Collect, does it always release memory when a function has finished, do I need to add delete's in to my destructors?
kind regards,

jB  smiley-cool
24  Using Arduino / Programming Questions / Software Reset on: June 17, 2012, 05:17:26 am
Hi,

Can I reset an Arduino via a reset function call or do I have to do something with the reset pin?

Thanks and kind reagrds,

jB  smiley-cool
25  Using Arduino / Programming Questions / TX / RX etc LEDS on: June 17, 2012, 05:14:57 am
Hi,

Is it possible without interfering with the usage of the RX pin etc, to drive an LED from it, so that it extends the SMD leds and can be mounted on an enclosure so that I can see if data transfer is happening etc.
If so, how so? And can all te pins do this?
Any advice gratefully received.
Thanks and kind regards,

jB  smiley-cool
26  Using Arduino / General Electronics / Re: PCB Socket for ATMEGA328P-PU on: May 31, 2012, 12:20:55 pm
Thanks very much to all for the support.
Kind regards,
jB  smiley-cool
27  Using Arduino / General Electronics / PCB Socket for ATMEGA328P-PU on: May 31, 2012, 08:28:30 am
Hi,

Could someone please advise me what pcb socket I should get for an ATMEGA328P-PU, as I would rather solder a socket to a PCB than the chip so I can remove it if needs be.
Thanks as always,

jB  smiley-cool
28  Using Arduino / General Electronics / Re: Finding the right IC? on: May 23, 2012, 05:05:29 pm
Hi,

Thats exactly what I am doing too.
I have 4 linked Arduinos, with the mega as the master / web server. It also monitors gas production, flame etc, plus manages the cabinet, turning on fans and pet coolers when necessary.
2 Arduino UNOS.s manage a bank of 12 batteries each. The last manages the weather as I'm a nerd or geek or whatever the saying is now.
I will add 1 more to manage the PV cells, and 3.5Kw Wind Turbine (3 Phase).
As the whole lot is wired to my home network I can view the output as web pages.
I currently use a Debian Server as an SMS Gateway to sned alert messages etc.
I will switch that to an UNO running PPP interfacing to an MySQL database on the Debian Server as soon as I can.

At the moment I am busy making sensors boards for each battery so that only 1 input is required to the UNO for each battery.

I will keep updating my hit and miss progress.

Kind regards,

jB
29  Using Arduino / General Electronics / Re: Finding the right IC? on: May 23, 2012, 12:30:03 pm
Hi,

Strictly speaking Yes, but in practice No, as each battery is an independent entity that has various attributes such as, level of electrolyte, temperature, degree of sulphation, strength of electrolyte, etc. So to obtain the SOH of a battery (State of Health) I must accumulate as much data as possible then maintain a history trail, much like a weatherman. This will help predict ETOF (Estimated Time of Failure) so I can get the pennies ready for a replacement, also it will advise me which batteries are over or under performing in the banks so that they can be moved around.
It's all great fun, especially when you are partially sighted and disabled which was the instigator of the project...

I'm also on the lookout for external liquid level sensors (don't want the electrolyte to eat them) and the Holy Grail of a Specific Gravity Sensor.
And I want to make a small pulse generator (around 800Mhz) to work on the secondary sulphation.

Kind regards and thanks to all,

jB
30  Using Arduino / General Electronics / Re: Finding the right IC? on: May 23, 2012, 07:10:14 am
Hi,

I want to take the temperature, current & voltage etc from each of my batteries used in an off-grid Photovoltaic, Wind Turbine bank.
Each battery is rated 2vdc 1200aH Lead Antimony Solid Plate Electrolyte, but sways up and down during charging, desulphating etc.
I have 24 so want a pcb per battery. ( 2 banks of 12) for a 24vdc array.
I hope to add in liquid level sensors etc.

Thanks,
jB  smiley-cool
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