[Bugs] #3258 UNSP: Turtleart XO-1.75 sensor calibration

[Sugar Labs Bugs]

#3258: Turtleart XO-1.75 sensor calibration
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    Reporter:  tonyforster                |          Owner:  walter                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Turtleart                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 as at writing, r1 r2 v1 v2 are all the left audio channel

 in voltage mode, the input impedance is 1k ohm which implies the bias is
 not turned off

 calibration factors

 voltage    =(buf+9347)/13000
 resistance =(46000000/(30514-buf))-1150

 calibration spreadsheet attached

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3258>
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