anchor.diff:  
       let sensor = model.ObjectSensor
       let buttons = new ButtonPad()
  -
  -    model.LedStripe.SetPower (75, 20, 20)
   
       let sensorOutput = sensor.ToObservable()
       
  
positive.code: let red = (100, 0, 0)
  let green = (0, 100, 0)
  let blue = (0, 0, 100)
  let black = (0, 0, 0)
  let white = (100, 100, 100)
  let brown = (65, 17, 17)
  let orange = (100, 65, 0)
  let yellow = (100, 100, 0)
  
negative.code: let purple = (63, 13, 94)
  let pink = (100, 75, 80)
  let colors = 
      [red; green; blue; brown; orange; yellow; teal; purple; pink]
  
  let scale var mA sC  = (Trik.Helpers.limit (-mA) mA var) / sC
  
  