Must-haves for EASY DIY controller?

[DustinB]

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=ENC28J60-I/SP-ND

 

[sanddune600]

guess I should have looked a little harder

 

[DustinB]

New boards finally made it in today, so far they look good.



Now off to the soldering station.

 

[sanddune600]

I was all but ready to order all the parts if I do and these boards are bad for some reason like the last I would still need all the same components right

 

[DustinB]

Yes, you will still need all the components. I just finished soldering, about to switch the chips and test.

 

[DustinB]

Well it looks like we have a winner, at least from my end. We'll know for sure once the other guys test.

I forgot C10 was switch to through hole. Luckily, you can solder a surface mount capacitor to a through hole location. It also appears 2 capacitors were removed, C14 and C30. I haven't looked to see what those were.

 

[nauticac4]

DustinB


Took a look at the pictures awesome work... I think we might need you to post some more of the pictures and sum it up for us. I am beginning to solder my parts and looking for some insight. Good Job to all involved glad to see all the hard work beginning to pay off.

 

[DustinB]

I'll try to do a small write-up on a few things, ie: temp probe, relay control.

Are you using one of the original boards? Keep in mind you will have to fix a couple problems on the board so you don't fry you ENC28J60 chip. Also the main AVR is connected to the ethernet chip. The new board has the fixes in place and has the second AVR connected to the ethernet for more program space as the webserver portions could be rather large.

 

[nauticac4]

I'm not 100% which board I have I'll have to look at it when I get home to see if there is a rev number on it. Its a spare board I got from DWMZ a few weeks ago.


What are these?

DIODEPTH
M08
M06SIP
HR911105A
M04PTH
M02POLAR


They are in the BOM but I am lost as to their use and couldn't find them on the eagle layout...

 

[DustinB]

The board you are using is the prototype board with the problems I listed. You will probably want to get the latest version once we know for sure there are no problems. It's looking promising though. You could still use the board if you wanted. I'm going to be using my protoboard for one of my other tanks by making a breakout board for the ethernet.

DIODEPTH is the diode located near the 5v surface mount regulator.
M08, M06SIP, M04PTH, & M02POLAR are just the various headers. You can see what I used here:


HR911105A is the HANRUN Magjack for the ethernet. I have not found a local source for this. It looks like the only source is ebay from china, just search ebay for the part#. Takes about 2 weeks to get it in. I was using the wrong magjack in the above picture, make sure you get the HR911105A.

What are these?

DIODEPTH
M08
M06SIP
HR911105A
M04PTH
M02POLAR

 

[sanddune600]

What programs are you guys using to view sketches (using windows 7 could install linux if needed)

 

[sanddune600]

on the bom it shows line 2 and 12 with the same part number but the values are different am I missing something

 

[DustinB]

We're using the arduino IDE. http://arduino.cc/en/Guide/Windows

You can install the software on the page, but wait til you get everything else including the usb-bub or other rs232 equipped cable to install the drivers. You can view the sketches with the software. Otherwise you can view them with wordpad or any text editor. I use conText for C++.

I don't know why they are listed like that. 100nF = .1uF. They are the same part.

 

[sanddune600]

I have that program I was talking about the board gerber and .sch

 

[DustinB]

The board files were created in eagle: http://www.cadsoftusa.com/download.htm

 

[DustinB]

Well nobody order boards just yet, it appears U11 is still reversed. I compared both of my boards and U11 is the same.

TeraHz: When you reversed U11 did you have to change anything out? The -5v regulator was running really hot before reversing U11, after reversing it runs cool but pH displays as 0.00.

 

[DustinB]

To be more clear, -5v regulator, as in U10 was running very hot.

 

[terahz]

Dustin, I remember Having trouble with U10. Had to get rid of some cap...

Hmm, something is not right in the PH circuit. The 7660 chip is drawing almost 300ma and gets very very hot. Everything else draws another 200ma, so with all ICs populated and without the LCD I get a current use of a bit under 500ma which is a lot! It is getting a bit late today but I'll try to see what's wrong and will post back.

EDIT: BTW max input voltage for the 7660 is 10V, so 12V psu will not work:
"V+ Power-Supply Positive Voltage Input. (1.5V to 10V). V+ is also the substrate connection."


EDIT2: for some reason the 7660 puts out only -2.8V. It almost feels like it is in low voltage mode, but I don't see P6 being connected to anything.

Ok, looks like C30 is the problem. I removed it and now total current is 253mA, the 7660 is not hot anymore, but it is still not working properly. Now the 7805 is acting up... anyways I'll leave it for tomorrow.

I think that's when DWZM noticed that the U11 was reversed and all was good after that.

 

[DustinB]

I did some testing with a scope last night against my old board and it appears that nothing is happening as far as reading activity. The strange thing is that I get -5v at U11, follow that lead to U8 and I still I get that -5v. Now follow that lead to U9(the V- pin) and I get +3.7v. On my old board I get -4.x. I don't see anything different other than a .1uF cap missing on the 7660. I tried adding that and no change. :spin2:

 

[DustinB]

Well I found out what the problem was, just a minor glitch in the particular board I used. I tested some of the others and they are just fine. It was just one of the pads not having a good connection to the trace, so that's why it wasn't receiving the -5v.

Everything on the board works great, just need to fix the eagle file to reverse U11.

Once TeraHz tests his board we should know if everything is good for sure. :thumbsup: