RE: dash7 pictures

Jason wrote:
> I've got a few questions, Tor:

At last some tech questions :-)

> -- what's the sample frequency?

I take it you've downloaded the PC software and had a look? Sample
frequencies are
- 5Hz for Speed, Revs and Oil pressure
- 1Hz for the rest, ie water temp, oil temp, inlet temp, battery

I'm thinking of going 10Hz for speed and revs, but I can't see the point in
sampling the others more often.

Resolution is:
- Revs: 1Hz
- Speed: 1kph/mph
- Temps: 1C/F
- Pressure: 0.03bar/ 0.43psi
- Battery: 0.1V

The resolution can be way better on most but memory will suffer.

> -- how long can recording last?

41 minutes at current sampling/resolution.

> -- what's the connection to the PC? Serial?

Yes.

> -- can I get a real-time output of the sensor readings, e.g. over the
> serial link?

Not at the moment, but if there's demand for it I can't see why not.

> -- can the laptimer be triggered by a button (IR beacons being banned at
> most trackdays)?

Yes! At last someone who thinks this is a valid point... In fact this is
currently the only trigger, but I'm looking into a receiver. If I go for one
of the most common frequencies I don't have to make a sender.

> And I've got a decent digital camera...

I will definitely take some new photos tomorrow. Having those pics on the
server is embarrassing...

> I also have a request / hint: how about storing the files in some
> text-based format (doesn't have to be XML, although that would be
> trendy)? This would allow the hackers amongst us to make up for any
> features that you might miss out (although there doesn't seem to be much
> scope for that, since dash7 does absolutely everything as standard).

Making a parser with the flexibility that your asking for is simply too much
work, and without going to a near source code level you still have
limitations. Another reason is that microcontroller memory is very limited,
and a parser would just eat too much of it. I would rather put that effort
into making the features. Just let me know, if it's a good idea then I'll
likely put it in.

Tor Atle
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