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ATmega16 programmer circuit

E

eden

Jan 1, 1970
0
I posted about this circuit
[http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png]
some months ago. Back then I thought I cleared all mysteries, but it
seems I still have some problems.

I have put together all parts, but using uisp program I can't see the
ATmega16 chip, so I guess I must have wired something wrong.

First, I realize that I used wrong capacitors for C3 and C4, instead
100n I took 10n. Could this be the problem? If I measure the voltage
after IC2 it seems correct.

Second, I wonder now, do I have to put some GNDs together, like the one
near C1 and C2 with the one near C3? And maybe also the one coming out
from pin 11 from IC1?

When I asked first time about the circuit, I was confused by the 3 VCC
symbols, and then most agreed that they all should be joint, and I did
that?

Do somebody see some catch here, what could I be doing wrong?
Thanks for any help.
Goran
 
J

JimW52

Jan 1, 1970
0
eden said:
I posted about this circuit
[http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png]
some months ago. Back then I thought I cleared all mysteries, but it
seems I still have some problems.

I have put together all parts, but using uisp program I can't see the
ATmega16 chip, so I guess I must have wired something wrong.

First, I realize that I used wrong capacitors for C3 and C4, instead
100n I took 10n. Could this be the problem? If I measure the voltage
after IC2 it seems correct.

Second, I wonder now, do I have to put some GNDs together, like the one
near C1 and C2 with the one near C3? And maybe also the one coming out
from pin 11 from IC1?

When I asked first time about the circuit, I was confused by the 3 VCC
symbols, and then most agreed that they all should be joint, and I did
that?

Do somebody see some catch here, what could I be doing wrong?
Thanks for any help.
Goran
You need to connect all grounds together.

Jim
 
J

JimW52

Jan 1, 1970
0
eden said:
JimW52 said:
eden said:
You need to connect all grounds together.

Jim

By all you mean even the one coming after the LED? And maybe even the
two from the Parallel port?

Goran
Yes, ALL gnds must be joined together, also all vccs should be joined
together. If you think about it,. how would say the LED work if its
ground connection was disconnected. There would be no current flow and
so no light.

Note that VCC_OUT needs to be connected to the points marked VCC. This
is obviously an error in the diagram. Also AVCC needs to connect to VCC
and AGND needs to connect to GND.

For better programming options have a look at
http://www.lancos.com/prog.html

HTH

Jim
 
E

eden

Jan 1, 1970
0
JimW52 said:
eden said:
JimW52 said:
eden wrote:
I posted about this circuit
[http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png]
...

You need to connect all grounds together.

Jim

By all you mean even the one coming after the LED? And maybe even the
two from the Parallel port?

Goran
Yes, ALL gnds must be joined together, also all vccs should be joined
together. If you think about it,. how would say the LED work if its
ground connection was disconnected. There would be no current flow and
so no light.

Note that VCC_OUT needs to be connected to the points marked VCC. This
is obviously an error in the diagram. Also AVCC needs to connect to VCC
and AGND needs to connect to GND.

For better programming options have a look at
http://www.lancos.com/prog.html

HTH

Jim

Thank you very much Jim. I am still quite new and some things are still
confusing me.
Of course, if I can't make it work I will look for something like
ponyprog, but I wanted to try this by my self, like learning curve for
both electronics and embedded programming.

Thank you once more,
Goran
 
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