code: func (d *ADS1x15Driver) Read(channel int, gain int, dataRate int) (value float64, err error) {
  	if err = d.checkChannel(channel); err != nil {
  		return
  	}
  	mux := channel + 0x04
  
  	return d.rawRead(mux, gain, dataRate)
  }
docs: // Read reads the voltage at the specified channel (between 0 and 3). The result is in V.