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31  Using Arduino / General Electronics / Finding the right IC? on: May 23, 2012, 05:16:19 am

I am looking for an IC that can handle a number of inputs then when requested send the specific input as an single output.
I think this is a series of input gates that open one when requested to allow data passage through the output.
I want to make a PCB that receives input from 5 or 6 sensors then upon request delivers the appropriate sensors info down the output line.

Can anyone please advise me if this is doable and if so where I should look for the IC.
And also if there is an easy way of finding IC's like a look-up table?
I also think I will need to change some of the data to be analog so that all data could be analog output.

Appreciate the help.

jB  smiley-cool
32  Topics / Device Hacking / Re: Arduino Board Diagnostics on: May 01, 2012, 04:02:37 am
Hi Nick,

This is superb stuff just what I was looking for.
It would be great if we could get some sort of db going with the signature bytes xrefed against boards.
I will try on my boards and post the outcomes.

I know it probably sounds grandiose but I think it would be great to eventually end up with a diagnostic sketch, that reported on as many features as possible.
I've always enjoyed looking under the hood, and remember years ago using code from Dan Brown to create a full DOS diagnostics suite. It came in really handy when I was freelancing as a repair man as I could run my program and drill down to obvious issues rather than hunting for the elusive needle in a haystack.

Kind regards to all "Hoodies",

jB   smiley-cool
33  Using Arduino / Sensors / RX Data Sensor Circuit for 868.35Mhz on: April 26, 2012, 05:58:47 am

Could some genius please help me with a design to create an RX sensor for 868.35 Mhz.
Sparkfun & others have sensors for 433Mhz etc but I cannot find one for 868.35 Mhz.

So I either need to develop a similar sensor from scratch or can I buy a 433 Mhz sensor, unsolder the 433 Mhz receiver and replace it with a 868.35 Mhz receiver.

I have a number of salvaged items that transmit at 868.35 and want to capture their data.
I am not sure if it is ASK or FSK either.

Really appreciate any help.
Thanks and kind regards,

jB  smiley-cool
34  Using Arduino / Sensors / Re: Voltage, Amperage & Tempearture Sensors for reading 2vDC Batteries on: April 13, 2012, 07:00:49 am

Thanks for all the help, (so far (grin))
I intend to simplify as much as possible with 1 bank of 12 2vdc batteries per Arduino Uno.
These plus other Arduinos with other data will be daisy chained to an Arduino Mega, which will act as a server / master and correlate the data for storage, alert management and web deliver etc.

I also have a wind turbine to throw into the mix.

When I get there I will deliver a report for the forum, but along the way I am sure I will be asking many, very trivial and inane questions. That's just me, anal and pedantic in extremus. My wife thinks I'm mad, my psychiatrist thinks I am getting better, slowly.

Thanks to all,
Kind regards,

jB  smiley-cool
35  Using Arduino / Sensors / Re: Voltage, Amperage & Tempearture Sensors for reading 2vDC Batteries on: April 12, 2012, 01:05:36 pm
This electronics is going to be fun. More reading to do (grin).

What I really want to do is build a small board for each battery.
Then feed a banks worth (12 batteries) data into the Arduino. Not just 1 battery.
So I suppose I am looking for a bit of a steer as to what to buy to make up each mini pcb.

Kind regards,
jB  smiley-cool (PS I am disabled and partially sighted so this icon looks like me)
36  Using Arduino / Sensors / Voltage, Amperage & Tempearture Sensors for reading 2vDC Batteries on: April 11, 2012, 01:17:38 pm

I would like to read the voltage and amperage and temperature of my off-grid batteries. Each being 2vdc Lead Acid 1200aH.
Could someone please recommend the sensors I should use, I will connect them up to make a module for each battery.

Thanks and kind regards,
jB  smiley-cool
37  Topics / Device Hacking / Re: Arduino Board Diagnostics on: April 11, 2012, 05:02:49 am

The answer as to why is "is it possible and how"?

If the project I am doing is viable I would like to be able to interrogate the systems remotely seeing what board is in use, what my firmware is etc.
Now I could obviously encode into the eeprom various bits of info but if something is there already I would rather not re-invent the wheel.

I also suppose that ultimately it would be nice to have a diagnostics library able to return information much like diagnostic tools on Linux & Windows do.

To me it's a bit like why invent the light bulb when we have candles? It's just a logical step of data acquisition.

Really appreciate though any help in making a diagnostics library.

Kind regards,

jB  smiley-cool
38  Topics / Device Hacking / Re: Arduino Board Diagnostics on: April 10, 2012, 06:13:17 am
Hi CrossRoads,

Thank you for your reply.
I am attempting to obtain information about the Arduino Boards for a project.
I think the first step is to look as you said at the signature bytes to ascertain the Atmel chip type.
Now as I am new to Arduino but am an old dog that has to take up c and c++ again to achieve my project, could you please give me a pointer (no pun intended) as to how to retrive the signature bytes?

Appreciate your help.
Kind reagrds,

39  Topics / Science and Measurement / Welltech Radio Weather Station on: April 09, 2012, 08:37:05 am

I was purchased a number of years back a Welltech Radio Weather Station.
I would like to intercept the data being sent to the indoor console and utilise this myself, rather than buying a whole raft of new sensors.
The data on the back of the console reads RX868-3V / 868.35 MHz.
Does anyone know if this is doable? And what I would need?

Thanks as always,

jB  smiley-cool
40  Topics / Device Hacking / Arduino Board Diagnostics on: April 09, 2012, 07:25:27 am

Is it possible to ascertain various bits of system information, programmatically, such as Board Type & Revision, Available Memories etc.

41  Using Arduino / Networking, Protocols, and Devices / Re: Linking Arduinos on: March 04, 2012, 05:18:32 am
Thank you very much to everyone for their support. I feel much more confident now... (Probably just slammed myself now (grin)).

Kind regards,

jB  smiley-cool
42  Using Arduino / Networking, Protocols, and Devices / Re: Linking Arduinos on: March 02, 2012, 02:03:17 pm
Thank you.

So to be exact it would be a daisy chain rather than a star style connection?
The connection of a 4.7K pullup to +5V, I have to admit consfuses me at this stage to what does that connect or is that like a terminal end as in the old style BNC networks.

I am only just starting out and have both electronics and arduino books on the go at the same time, so will eventually learn (I hope), but at this stage I get a tad confused when the unexpected slaps me round the back of the neck.

Patience appreciated.

Kind reagrds,

jB  smiley-cool
43  Using Arduino / Networking, Protocols, and Devices / Re: Linking Arduinos on: March 02, 2012, 11:43:13 am

Thanks for the reply. Sorry to be so pedantic, does this mean

That Slave 1 A4 goes to Master A4
        Slave 1 A5 goes to Master A5
        Slave 1 Gr goes to Master Ground
That Slave 2 A4 goes to Master A4
        Slave 2 A5 goes to Master A5
        Slave 2 Gr goes to Master Ground
That Slave 3 A4 goes to Master A4
        Slave 3 A5 goes to Master A5
        Slave 3 Gr goes to Master Ground


jB  smiley-cool
44  Using Arduino / Project Guidance / Re: TCP setup from EEPROM on: March 02, 2012, 05:55:57 am

Like IPv4, MAC's are limited so many new devices offer the consumer the ability to change the MAC to one that is not being used on their internal network.
As to obtaining a unique MAC for exploitation on the Internet I have as yet no idea, I suspect it costs a bit and is tied up in red-tape.

Reserved IP under DHCP could be a solution, but I would like to offer the ability to set IP, gateway, netmask, DNS etc, once again offering the client more scope.

Indirectly though, your responses have begun to answer my primary question as to whether the MAC and IP had to be hard-coded. I suspect not, as long as the read from EEPROM was called from setup() as a first port of call so to speak.

Thanks though for the swift responses, great forum,
jB  smiley-cool
45  Using Arduino / Project Guidance / TCP setup from EEPROM on: March 02, 2012, 05:17:50 am
All the examples I have seen of Ethernet networking hard-code the MAC and IP address into the code.
I would like to offer a setup page so that the MAC and IP and Web Server Port, Workgroup / Domain can be retrieved from the EEPROM.
The details could then be changed via a Web Page and written back to the EEPROM, thus allowing good integration with consumer networks.

Is this viable or does the MAC and IP have to be hard-coded?

Thanks and kind regards,

jB  smiley-cool
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