LiquidCrystal_I2C
LiquidCrystal_I2C library for Spark Core
I had a lot of difficulty getting the I2C library:
https://gist.github.com/anonymous/dc7ecc5e6574105b4fbd
for Spark Core working without corrupting the display...
I modified the library, adding a few delays following the writes and it works for me, now.