Imports periph.io/x/periph periph.io/x/periph/conn/i2c periph.io/x/periph/conn/i2c/i2creg periph.io/x/periph/conn/pin periph.io/x/periph/conn/pin/pinreg periph.io/x/periph/host Standard library imports errors flag fmt io/ioutil log os