EM4095 Reference Design KIT doesn't work

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

Hello all,
I'm Khanh An. I'm from Vietnam.
I bought EM4095 Reference Design KIT, RFID ISO card, RFID Key Fob from MCS Electronics.
I program it by em4095-sample.zip which I download from MCS Electronics website.
But it doesn't work. LCD appear

Lcd " EM4095 sample",
Lowerline : Lcd "MCS Electronics"
Upperline : Lcd Time$ ; " Detect"

when I take RFID ISO card near antenna, nothing happen, when I press S3 LCD appear Lcd "Add RFID"

I don't know much about bascom.
Could you help me?
Thank you very much.
Khanh An

Evert :-) · Joined: 18 Feb 2005 Posts: 2165

Hello Khanh An,

Welcome to the forum and merry Christmas to you all.
There's a error in the drawing and parts list.
Change CDV2 from 1N to 10N.

Maybe Ben Zijlstra can confirm that he has also 10N inserted?

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

Thank you for your reply.
I change CDV2 1N to 10N. But there is no change.
Do you think EM4095 doesn't work.
I buy two KIT. But both doesn't work.
Could you help me.
Thank you very much.
Khanh An

Evert :-) · Joined: 18 Feb 2005 Posts: 2165

Did you change the fuse settings of the AVR? Clock divided by 8 must be switched off.

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

before

after

But it no change.
The second in timer display on LCD is smooth.
Example: before 00:23:10 --> 00:23:16
after 00:23:10 --> 00:23:11

Evert :-) · Joined: 18 Feb 2005 Posts: 2165

Maybe you can try it now again with the original 1N capacitor.

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

Hello Evert

I try . But no change.
KIT 1 I use 1N
KIT 2 I use 10N
I program it by em4095-sample.zip
Do you try program kit by em4095-sample.zip
Could you help me.
Thank you very much
Khanh An

ibilzh · Joined: 11 Jul 2007 Posts: 151 Location: Germany

Hi,

@evert
>There's a error in the drawing and parts list.
>Change CDV2 from 1N to 10N.
Why? Did you calculate it after spec sheet?

@khanh_an111
After your description the board works but not the RFID side.
Do not play too much with fuses. The atmega is shipped with special
settings for boot loader. Do not kill that.
I would do the following:
- controll all parts to be assembled ok.
- Have a special look for short cuts nearby the EM4095 chip.
- Test the EM4095 Chip if it gets hot.
- Is the coil well connectet.
it is varnished - clean the contacts or solder it.
- If you have an oscilloscope measure directly at the coil.
be careful: With the 10 nF cap you can measure up to 800 volts.
- Is the board clean? Colofonium under the chip or capacitors
can switch off any funktion. Clean with aceton.
I have a page about troubleshooting for the EM4095. Look here and
use Google translate.
http://www.emagu.de/archiv/EM4095_rep/EM4095_rep_anleitung.htm

hope this helps

Gerhard

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

Hello ibilzh,

Thank you for your reply.
I see when the antenna near the monitor.
The monitor is interfered.

I check but it no change.
Now it still doesn't work.

Could you help me.
Thank you.
Khanh An

bzijlstra · Posted: Sun Dec 28, 2008 9:37 pm Post subject: Working here...

Have ordered the kit from www.mcselec.com, have put it together using only the components that came with the parcel, and it is running very well.

Have to take the protective shield from the display, that is all Very Happy

It is working with the white card and with the RF-drop that came with the kit.

Pin 9 of the MAX232, that is in a socket, is outside the socket. As you can see on the picture.

Have fun
Ben Zijlstra

bzijlstra · Posted: Sun Dec 28, 2008 9:39 pm Post subject: Another thing...

Another thing....

After you press S3 you have to put a RF-card you would like to recognize above the coil. After that the card is working.

Have fun
Ben Zijlstra

ibilzh · Joined: 11 Jul 2007 Posts: 151 Location: Germany

Hi khanh_an111,

it is difficult to help with this few info.
Evert has, i think a good idea with frequency.
It is important, that the internal oscillator is in use and the frequency
is at 8 MHz. (divide clock by 8 is disabled)
This is your third picture (your comment is after) and i think this is OK.
Please look into your BASCOM CODE if you have this entry:
$crystal = 8000000
The important thing is that Mega88 and program has the same speed.
If i understand right, you say that the time is smooth. Do you mean that the
time is too slow??????
I made a test. I switched on devide clock by 8. This means the ATMega
runs at 1 Mhz. Then the clock in the LCD changes in steps of 7 seconds.
And no Tag can be read. Then i change this in the code:
$crystal = 1000000
Then i compile it new and burn the Mega88. Then i can read again the
TAG. This means now all runs at 1Mega Hertz not at 8 Mega Hertz.

Please try first with the original board to change the code: $crystal = 1000000
Look if the clock runs nearly normal, and test to read a TAG.
When this runs the problem is the frequency of the Mega88. Look then into
the manual of your programmer and look if the hook means programmed or
not programmed. You have to make sure that the Mega88 runs at 8 MHz.

Regards
Gerhard

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

Hello Ben Zijlstra and Gerhard,

Thanks for your reply.

These are some images about KIT.

@ In case $crystal = 8000000
This is image when I just program it.

This is image when I press S3.

The LCD does not display data of tag.

@ In case $crystal = 1000000
I change 8000000 --> 1000000. But it no change.
When I press S3.
The LCD display "ID " (not Add_RFID").
I don't know why.

This is the program I download from MCS Electronics
http://www.mcselec.com/index.php?option=com_phpshop&page=shop.getfile&file_id=101&product_id=171

Could you help me.
Thank you.
Khanh An.

ibilzh · Joined: 11 Jul 2007 Posts: 151 Location: Germany

@Ben Zijlstra
good idea the flying Max232. Interesting bootloader.
Extremely helpful - my respect.

Hello khanh_an111,

A stupid question. Do you hold your card or keypad over the coil???
When you switch on the board, you see the time and text, then
the reader is ready to work.
Display shows now:
00:00:20 Detect_
MCS Electronics
Hold your keypad over the coil. Nearer than 3 centimeters.
You do NOT have to press any key now.
Look to the picture.
Then in the lower line you can see the TAG-ID (number )like this:
00:06:00 Detect
EA,7E,6C,00,16,_

Try also to disconnect your programmer after programming.
Then disconnect the power (batterie) and connect again.

Gerhard Günzel

khanh_an111 · Joined: 25 Dec 2008 Posts: 15 Location: VietNam

Hello Gerhard,

Thank you for your reply.

Yes, I hold card or keypad over the coil.
But when I hold card or keypad, these is no change.
Those images you see above, I capture them when I hold card or keypad.

The connection in antenna is good. I check it.
Could you help me.
Thank you.
Khanh An.