[Bugs] #552 NORM: Turtle art, reinstate sensor input

[SugarLabs Bugs]

#552: Turtle art, reinstate sensor input
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    Reporter:  tonyforster  |          Owner:  walter                     
        Type:  enhancement  |         Status:  new                        
    Priority:  Normal       |      Milestone:  Unspecified by Release Team
   Component:  Turtleart    |        Version:  Unspecified                
    Severity:  Unspecified  |       Keywords:                             
Distribution:  Unspecified  |   Status_field:  Unconfimed                 
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 See tickets 343 and 155
 Sensor input is disabled in TA V42
 1)There are issues with alsaaudio on non XO architecture which need
 resolving.
 2)Voltage should convert as avg, not rms (as does resistance)
 3)Alsaaudio appears to be returning an undersize buffer occasionally in
 TAP V18 which crashes pitch ( unpack() is given an odd length string ) and
 I think produces occasional zero values in other modes

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Ticket URL: <http://dev.sugarlabs.org/ticket/552>
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