code: func (d *Adaptor) PwmWrite(pin string, value byte) (err error) {
  	if !d.pwm {
  		if err = d.littleWire.pwmInit(); err != nil {
  			return
  		}
  
  		if err = d.littleWire.pwmUpdatePrescaler(1); err != nil {
  			return
  		}
  		d.pwm = true
  	}
  
  	return d.littleWire.pwmUpdateCompare(value, value)
  }
docs: // PwmWrite writes the 0-254 value to the specified pin