[PATCH] Visualisation of individual oxygen sensor data for CCR dives

Joakim Bygdell j.bygdell at gmail.com
Wed May 10 03:20:15 PDT 2017

On 10 May 2017 at 11:33, Anton Lundin <glance at acc.umu.se> wrote:

> On 10 May, 2017 - Jef Driesen wrote:


Do we have any data from a Shearwater running as solenoid controller?
> Ex. On the JJ-CCR's they use a Shearwater Petrel with sensors which
> controls the o2 solenoid to try to get the o2 sensor values to match
> your configured setpoint.
> I have data from a JJ in eCCr mode.
There is no sensor data in that log, only setpoint information at the
when the setpoint changes during the descent and before surfacing.

> That said, I think setpoint values are still interesting to see, to
> validate how well the controller did manage to try to keep the o2 close
> to the setpoint.
> Attached is the last iteration I did of the sensors patch. It has some
> minor differences from the one you included, but most of them isn't that
> relevant.
> The only relevant information is that the adc offset value is probably
> in 0.025 mV as unit.
> Thats party based on the information in
> https://www.shearwater.com/wp-content/uploads/2016/07/O2-
> Offsets-Public-Notice-RevA.pdf
> The only real comment about the code is that I would have liked to see
> the calibration factor kept as a int, and just change the unit factor
> from .00001 to .000022, between the models.
> //Anton
> --
> Anton Lundin    +46702-161604
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// Jocke
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