AMC 1.5 - missing device or unknown device -24

Hi,

I know i'm almost there, but there seems to be a problem with recognizing the atmega 8535.
Everything goes well untill I click the read-button. The red led is on while attempting to connect
to the amc, then I get the message missing device or unknown device -24.

What can this be? Is it a bad connection on the amc?

gr. Jeroen

Re: missing device or unknown device -24

It is most likelly a cold solder spot, a shortcut, or a backwards placed part. Or perhaps the wireing is wrong. Please make high res pics of your AMC (both sides). Use a scanner if you have one available.

regards
Christian

Re: missing device or unknown device -24

Hi,

Here are 2 pics of the amc1.5...

Re: missing device or unknown device -24

I had the same Message with my ATMEGA. Did you try a another Crystal?, which Crystal are you using?. For example my ATMEGA wont work with a 24MHz Crystal, so i downgrade the Crystal to 22,18 MHz and it had worked. But you must use the correct firmware for each Crystal .

Re: missing device or unknown device -24

Hi,

Tried all 4 crystals. Same message.

Can it be a software problem?

gr. Jeroen

Re: missing device or unknown device -24

Hi,

I have a question. You told us you have Vista64. Is your account is the administrator's one? And I don't mean you having a account with administrators rights...!

<a class=postlink-local href=http://www.x-simulator.de/forum/howto-vista-and-x-sim-t1213.html target=blank>howto-vista-and-x-sim-t1213.html</a>

Maybe Vista doesn't allow ponyprog to control directly the com ports...


And last, if everything else fail, pay a visit to a friend that still has winXP and use his PC to program the firmware... This will confirm if the problem is on software or hardware...

Thanos

Re: missing device or unknown device -24

Hi,

Ok... re-installed xp 32 bits on my old computer. I installed the converter software and ponyprog2000. All went well...
I plugged the amc1.5 in and tried to read out the atmega. No succes... Still getting the
device missing -24 error.
Both chips are powered... measured the pins.

What to do now? Does this mean that it is a hardware problem?

gr. Jeroen

Re: missing device or unknown device -24

Hi,

The atmega8535 was broken. Got a new 1 and now everything works ok. Installed the 22mhz hex file.
Program succesfull.

But now in the display the 3th and 4th numbers keep on changing automatically without and with a
potmeter. Is this normal?

gr. Jeroen

Yes, pwm generated jamming Imo.
When my AMC is powered, I even have trouble to hold a stable BT connection with my mouse
But never mind...

However, you should keep the pot cable lenght as short as possible, and use shielded ones (e.g shielded audio cables) to reduce the noise. Use the cable shield as GND wire then.

Gruss
Christian

Btw, congrats that your AMC is working :thbup:

:lol: :lol: Its true that PWM produces much electromagnetic noise!! I even lose my wireless connection sometimes!!!! Its made to work as DIY hobby device, not to pass EMI tests!!!!! :rofl:

A Faraday cage could help

Hi,

Yes thanks ego... and thank you guys for all the help and Thanos for his
design and guidelines. I am not there yet...

Do not actually know at this point how to proceed... The next thing to
do is connecting the h-bridge, motors and potmeter?

And I do not know what the hyperterminal software is for... :?

gr. Jeroen

Have you read the PWM AMC15 Manual ?, and look at the first Page from Thanos AMC Motion Thread.
You need the Hyper-Terminal Software to change the KP-Paramter of the AMC Board. You find the Hyperterminalsoftware from Windows under (in German) Start/Programme/Zubehör/Kommunikation

Whereas KP = proportional constant

The proportional constant is the smoothness. You can reduce the smoothness to a point, where the acutaotors start to jitter, due to the dancing pot values.
The best setting depends on individual factors like mass inertia of your simulator and the quality of your pot setup. But the KP-value is just for tweaking. You dont need to test-drive your simulator.
So forget the hyperterminal, until your simulator is working.

Regards
Chrsitian

hello,
I am having the same problem device missing or unknown device. I have two boards and both of them have the same message.
I really hope I don´t have my ATMEGA broken. Also, I am using a 24mhz crystal.

thanks in advance for any help. My DYI post is at basic-2dof-configuration-and-faq-t1555-20.html

regards
Caue

I already answered you here: post16248.html#p16248

Please keep the conversation about your issues in one thread, the one you started it. Spreading it around will make it hard to follow.

Regards, Thanos

OK, I will keep my posts here
post16248.html#p16248
regards
Caue

Hi Thanos ...
Good day every one ...

I'm making an AMC1.5 motor motion-controller and trying to program ATMEGA853516PU using standard com1[112500_8_none_1_none] from the back of a tower computer ...using the modified configuration.ini with ponyprog2000 ...

I have a local cheep source for this series and tried the following on 5 ATMEGA's till now ... one per day


-for the first three IC's ...
When it is first power up ... I press the read for the security bits and it replied with the stander shipped configuration ...
modified the first one as your video [ SUT 11 & CKSEL 1110 ]then press write ... then the error comes out (missing device -24 ) ...
modified the second and third as ponyprog manual [ SUT 11 & CKSEL 1111 ] changing the I/O port setup between [SI Prog I/O] and [SI Prog API] then press write ... then the error comes out (missing device -24 ) :uups:

-The forth and fifth IC's from the same store as before...
I only pressed read of configuration then programmed it directly with your 22Mhz firmware and successfully programed ...
:yippiee: IT started and displayed the numbers of the x,y axis and the firmware information and version on LCD ...
with a slow motion or bad LCD refresh rate ...
also tried to connect to it with the hyper-terminal and the LCD displayed TIP:something I don't remember

I downloaded the datasheet for this IC and correct me if I'm wrong found that it's initially running on 1MHz and can be run on internal clock up to 8MHz by changing the CKSEL3..0 according to a specific combination [ 0100 ] in table9. page 29 of 321page datasheet :yes: ... I did and it worked faster :yes: ...

I tried to understand your sittings for thees CKSEL how they work ? but :
tried your sittings again and the error comes clearly on both IC's ... dead

I'm using a 22.1184MHz or 16.000MHz XTAL on a socket and a soldered 20PF capacitor for external oscillator ...
I've checked my home made PCB against the sun & with an AVO meter on 1x and mega ohm scales for every track for leakage and washed it out with AKAI cleaner :?
I'm really surprised of other people getting there Atmega's working from the first time . :
I feel I'm missing something ... :?
or I'm circulating in the wrong aria ?

Please advice ...
Boody

Hi,

I am having similar problems with the device unknown error whem trying to load te program into the AVR.
I am experienced at normal electronics but have not experimented much with micro controllers. I am skilled at manufacturing and soldering PCBs , so I am reasonable certain my board soldering and components are OK ( I've checked many times ) So the difficulties I am experiencing are due to not knowing what is required. If someone can help please do as I am sure there are others who are bumbling around like me, and of course the others who have submitted on this thread.

I suppose a good place to start from me is to ask a few obvious questions and statements that are not so obvious to me.

1. My 8535 data sheet says that the chip can be clocked from 0 to 16mhz . Does this mean it cant be overclocked?
2. I tried 24mhz - did not work and produced device unknown error. I replace the Xtal with a 16mhz and 22pF cap - produced device unknown error. I do not have a CRO so I can only assume the oscillator is working ( I have tried various Xtals)
3. I have made the connecting board, as per the video, to connect the programming port to the controller. The connections required are MOSI, MISO, SCK and GND ?? and the 3 jumpers removed next to the MOSI,MISO,SCK socket??
4. Because I have gone back to a 16 mhz Xtal, does this mean that I cannot use any of the Hex flash firmware - as the is not a 16 mhz file listed . Or can I use the 14mhz file??

Everything Looks really good, its just that I cant seem to get it to work. I think - a common problem that some of us are having.