HELP......please!  stand alone not working

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

Im trying to make a stand alone circuit for a ATMEGA168 based on this:
http://itp.nyu.edu/physcomp/Tutorials/ArduinoBreadboard

resulting in this:

only trouble being, it doesn't work! :frowning:

when I power up the board, all I get is the Red LED (have digital pins 2-7 hooked up to LEDs on another bread bored that work fine when I connect them to my Arduino running the same sketch)

I know its a tricky one without seeing the circuit up close, but any ideas would be appreciated......(starting with stupid school boy mistakes)

2

It's very hard to see on your photo, but i presume you have a 16MHz crystal on there? And two 22pf capacitors?

Have you set the AVR fuses correctly for crystal operation?

3

The "rails" along the top and bottom of most solderless breadboards of that variety are not continuous from end to end. They have a break in the center. Hard to tell if your power-supply circuit is supplying parts correctly at that end.

Note my jumpers:

4

Hope these photos are a little better?

Have you set the AVR fuses correctly for crystal operation?

the what now?

regards 6MHz crystal And two 22pf capacitors, yes.

The "rails" along the top and bottom of most solderless breadboards of that variety are not cledontinuous from end to end. They have a break in the center. Hard to tell if your power-supply circuit is supplying parts correctly at that end.

put the 4 jumpers in and thing went a little strange. had the board set up to run the 6 LED Night Rider loop (the sketch being on the chip...tested and working in my Arduino) and after connecting power the LEDs attached to pins Dig 7 6 & 5 lit up, and the LED attached to Dig 2 EXPLODED!?!?!? :o

5

I think you have the chip wired up wrong.

The pins are numbered from the top left hand corner in an anticlockwise direction. You appear to have wired it up identifying the chip pins as if you were looking at them from the under side.

6

are the pictures flipped? The dot for pin 1 appears to be on the top right hand side of your processor... cant really geta good view from your pics

7

I think you have the chip wired up wrong.

The pins are numbered from the top left hand corner in an anticlockwise direction. You appear to have wired it up identifying the chip pins as if you were looking at them from the under side.

are the pictures flipped? The dot for pin 1 appears to be on the top right hand side of your processor... cant really geta good view from your pics

Sorry my web cam seems to have flipped the photos just to make things even more complicated fr you all.

I used this diagram to wire up the chip http://itp.nyu.edu/physcomp/uploads/arduino_pinmap.png(i amuse its a top view with the indent top left, by pin one?)

8

You also have a black and red wire hooking to pos rail near your crystal. hard to tell if you ment that but i would think not.

9

You also have a black and red wire hooking to pos rail near your crystal. hard to tell if you ment that but i would think not.

Red= pin 7 - Vcc
Black= Pin 8 - GND

is that wrong? :-/

E2A

OMG your right, iv got the GND in the + rail!!!!!!!!! (what stunning eye sight you have.....will go retest now :slight_smile:

10

It might just look like it in the picture. I don't have the data sheet in front of me but on the side of the breadboard that has the crystal, there is a red wire going to Vcc then a jumper connecting 2 pins then there is a black wire that looks like its also going to Vcc instead of Gnd. I don't know if its supposed to be going to Gnd but usually black wires do. btw ive never wired up a stand alone so im just going off what I see.

11

ok, re tested and nothing, just the red power light :frowning:

is it possible that iv damaged certain components or the chip with my negligence?

and if so what ones should I replace?



12

think iv buggered up my ATMEGA168 (noticed i had my 2 22 pF capacitors going onto Vcc and not GND :frowning: now when i iput my chep into the Arduino to program, now i just get

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding

anything i can do to get that chip working?

13

(noticed i had my 2 22 pF capacitors going onto Vcc and not GND

That will not matter. It's the other stuff you did wrong that messed up your chip. The other components should be OK.

14

It's the other stuff you did wrong that messed up your chip

so it was having the crystal GND running into Pos that blew the chip....as that's the only other problem that's been identified? :-?

you phrased that a little harsh, sir!

15

you phrased that a little harsh, sir!

Check out my name :wink:

16

n00b, no worries, we all "mess up" and have "stuff we did wrong" too. It's true and we're not all snickering at your n00bishness.

That said, go order another ATMEGA168-with-bootloader (or two). If you're gonna play with standalone wiring, you should have a few on hand. The people developing the Arduino board have had to test, revise, retest, improve their design several times, and now you're trying to get it all right on the first try.

One question, do you have a digital multimeter? Volts and ohms? Why not? Go to Wal*Mart's car section and buy a cheap pocket version (digital, not analog) at the very least. Double-check your work often.

17

we all "mess up"

Too true. The person who never made a mistake never made anything.

18

One question, do you have a digital multimeter? Volts and ohms? Why not? Go to Wal*Mart's car section and buy a cheap pocket version (digital, not analog) at the very least. Double-check your work often.

Now have one and will use it :slight_smile: