Stuart Crawshaw

Has anyone got any experience with these units?

DSO Nano v2

I see, thanks for the link. But if I understand it correctly, this was supposed to reveal a possible bug (in A4/A5 multiplexing), which was not confirmed (?)

Agreed, but worth a try


I am in aggreement that Matteo does need a pull-up on the SCL line too...

What i am not aware of is the calculation needed to work out the value of the resistor needed, can you shed some light?

[*]I don't understand exactly how instantiating and disposing OutputPort objects is supposed to 'reset' the ports, the pin is set back to input state ('floating high') when disposed. I would start with commenting this code out.[/list]

Hi CW2,

This was suggested by Chris Walker, as he advised in another post that there could be a bug in the firmware and this sometimes fixes it.

Link Here - At the bottom of post #2

Hi again Matteo,

Did you try with the pull-up on the SCL line as well as the SDA?

Also,
Im not sure of the calculation needed to work out the resistor values for the pull-up resistors (sure someone could teach us both there)

But looking through the various articles it seems it can play a big part, See Here

Also, Could you advise where you attached your scope probes, just so any of these guys on here can replicate how you have your setup to see how their tests differ.

Additionally, could you explain to me the setup of your A0-A2 pins (just for my knowledge) why you set them up in such a way?
From what i can see, these would result (with the switches made) in a Logic-High? where as the address you supplied in code is all A0-2 pins being in a LOW state.

Hope we can get this resolved for you.

P.S. My old old old scope packed in last night so im on the lookout for a new fangled replacement and couldnt test my I2C signals as i said i would.

I personally use Hakko soldering equipment, and have been very happy.

They have a new entry-level soldering iron which is less than $100. I haven't used it, but if it's anything like their normal gear it's probably a solid buy.

http://www.adafruit.com/products/303

There are a ton of options out there... What does everyone else recommend?

Chris

Thanks for the suggestion Chris, not sure if these are available in the UK though, but its a good start (i could find another reputable manufacturer and look for similar if not better specs for the same price range).