AVR-Chat

On Fri, Jan 15, 2010 at 2:09 PM, Kenny M <kenny782@yahoo.com> wrote:

>
>
> Sorry this post is a bit long.
> I'm new to all this so be gentle LOL :)
>
> I'm working on my first project, which I've built and is working.
> All that's missing is the chip to control it.
>
> I've got a few AtTiny15's and an AVR-ISP v2 (usb)
>
> So built a target board and connected all the programmer pins to the
> appropriate pins on the chip.
> I also connected my 5V+/Gnd to the chip.
>
> Now this is where I get confused,
> I've found so many different schematics on the net...
>
> 1) This one just says connect everything as above and program
> 2) Run a 4.7kohm between reset and vcc.
> 3) Run a 4.7kohm & 10uf between reset and vcc.
> 4) Run a 4.7kohm & 22pf between reset and vcc.
> 5) Run a 4.7kohm & 10uf between reset and vcc, and an 800ohm resistor to
> all the other connections.
>
> Unless you have some serious noise problems you don't need any cap on
reset.
You may or may not need a resistor to vcc ( I have to check the data sheet),
but a 10k resistor will work, and will not cause any problems.
 4.7k should also work, but the value is a little low for ISP.

Check your ISP programming speed in studio.  It must be less the 1/4 your
AVR's clock speed.
 And double check all your connections. It always seems tricky getting this
stuff to work the first time. After a while it gets easier (well,
mostly/usually/hopefully).

> __._,_.__
>

-- 
carl
--------------------------------------------------------
Henry Carl Ott   N2RVQ    hcarlott@gmail.com


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