We’ve been hard at work doing a lot of upkeep on our Arduino libraries & tutorials. One of the ones we did today was the I2C/SPI backpack guide
https://learn.adafruit.com/i2c-spi-lcd-backpack
and the library that goes with it
https://github.com/adafruit/LiquidCrystal
We updated LiquidCrystal to Adafruit_LiquidCrystal so it doesn’t conflict with the built in LiquidCrystal. If you’re using ATSAMD21 or Trinket/Gemma, this library works great now, just grab the latest Adafruit AVR Boards package for Trinket Wire support