This Smart Controller contains a SD-Card reader, a rotary encoder and a LCD1602 display. You can easy connect it to your GRBL controller board（must have 5V/GND/TX/RX port）using a 5P-cable included. After connecting this panel to your GRBL controller board you don't need your pc any more.All actions like calibration, axes movements can be done by just using the rotary encoder on the Smart Controller. Machining your designs without PC, just with a g-code design stored on the SD card.
Communication with control board via serial port,need to connect TX,RX,VCC(5V),GND pin.
Use xloader.exe to download the firmware.
1.serial port tool to connect to the four pins of g-sender (vcc gnd tx rx).
2. [Device] select UNO; [COM port]choose your serial port tool corresponding; [Baud rate] select 115200.
3. Press the reset button on the back of g-sender and click [Upload] immediately.
