Sinan

i dont think the netduino 1 has pwm on the led.

also only 4 pwm channs

(5,6,9,10);

 

so iam not suprised your code crashes

 

http://www.netduino....duino/specs.htm

 

Noom,

Thanks for the answer, I missed that in the specs.

 

Intellisense for .NetMF can be annoyingly misleading some times. 

 

Thanks again,

Cheers, Sinan

I keep replying my own post, but one more update…

After reading this article and some more experiments, I have discovered that most trouble is caused by the type and/or the length of the cables on my breadboard. The SDA/CLK cables where 20cm long and I don’t know how thick they were. The connections where all OK. Anyway, everything started to work flawlessly after replacing these cables with very short (2 cm) ones. The pull-up resistor values are also less critical now, I can use the device with various resistors from 1k to 10k.
I suppose that this problem is caused due to wrong capacitance of the signal bus. Learning a lot these days.

Cheers, Sinan

Hi Padu, It works now with 1.8K pull-up resistors. I am really happy with my logic analyser Cheers, Sinan

Problem solved by applying 1.8K pull-up resistors. I first replaced the built in 10K resistors by 2.2K resistors but it didn’t worked. Also experimented with couple of other resistors without any luck. At the end, I have used the 10K and the 2.2K resistors in parallel (=1.8K) and finally tada… Cheers, Sinan

Same results here. I also have removed the built-in resistors and tried different resistor values without any observable effect.
It is a real black-box without suitable measuring equipment. I have ordered this logic analyzer hoping to gain some more insight.

I am curious about your findings.
Cheers, Sinan