AVRISP mkII - Home made Moteino not detected [SOLVED]

[Lukapple]

It's aliveeeee, my first DIY Moteino ! Looks like that 10K pull up resistor helped!
Thanks a lot for help guys !

[kobuki]

Nice to hear you succeeded. BTW, you mean, you're running it on 16 MHz and 3.0V? If so I'm definitely interested in long-term stability. It would make powering the Moteinos from cheap batteries even more viable.

[Lukapple]

Yes,I'm using 3V Voltage Regulator. I'll let you know if there will be any problems with stability.

[jra]

I'd also be curious to hear about stability.  Running an ATMega328p on 3.3v@16MHz is a little out of spec, 3.0v@16MHz should be a lot out of spec.

[bobe99]

Ok your problem is that CS (d10) is floating around when the radio is installed.
You will need to add a pull-up resistor on that pin. Use a 10K from D10 to 3.3V. That should fix it as long as your assembly is solid.

I'm a little confused. I have a "store" purchased Moteino w/RFM12b and it does not appear to have a 10k pullup between D10 and 3.3V. So what makes the resistor needed in this case and not in my case (assuming I just didn't miss the resistor while eyeballing the board)?

[Felix]

There is no 10k on the Moteinos on D10. That's needed for programming the RFM69 which floats the CS line, confusing the programmer. RFM12B doesn't do that.

[Lukapple]

I've tried to program another one, this time without RF module. Works fine without resistor.