detect nan errors added in the DHT example
detect nan errors added in the DHT example

karan259/GrovePi,karan259/GrovePi,karan259/GrovePi,karan259/GrovePi,karan259/GrovePi,karan259/GrovePi,karan259/GrovePi,karan259/GrovePi,karan259/GrovePi