code: func (t *TM1638Driver) sendData(address byte, data byte) {
  	t.sendCommand(TM1638DataCmd | TM1638FixedAddr)
  	t.pinStrobe.Off()
  	t.send(TM1638AddrCmd | address)
  	t.send(data)
  	t.pinStrobe.On()
  }
docs: // sendData is an auxiliary function to send data to the TM1638 module