Arduino board compatible with the SIM900 Shield. SIM900 Shield with a SIM card inserted. 3V CR1220 coin battery for RTC (optional). Connect the SIM900 Shield to your Arduino board, ensuring it's ...

GRBL is made for three axis spingle type cutting CNC machines. Marlin is made for multi-axis 3D printing. Makelangelo-firmware was initially developped by Marginally Clever Robots, Ltd. to address the ...