Yes, this should be supported. It's similar to the ImageGenerator 
settings... try this

 [[chart6]]
      title = Water level
      [[[leafTemp2]]]
          data_binding = sdr_binding
          yAxis_tickInterval = 6
          name = Water level



On Tuesday, March 3, 2020 at 8:27:28 AM UTC-5, Dan'l B wrote:
>
> Following the excellent instructions I’ve managed to add a new chart but 
> cannot work out how to get the data I need into it. 
>
> The value in question is from an SDR device mapped to leafTemp2 (I’m 
> running two instances of weewx: weewx.conf and sir.conf), so I usually use 
> it as ‘$latest($data_binding='sdr_binding').leafTemp2’, for example. 
>
> In my new chart, that doesn’t appear to work: 
>
>  [[chart6]] 
>       title = Water level 
>       [[[($data_binding='sdr_binding').leafTemp2]]] 
>           yAxis_tickInterval = 6 
>           name = Water level 
>
> How do I retrieve that value for the chart?

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