This is USB controlled relay opto-isolated board with 16 SPDT relays. You can use it for simple ON/OFF switching electrical devices - home lights, DC motors, solenoids and others. It can help you building projects like robotics and home automation.
This is Sainsmart 4.3 inch TFT LCD module,It is 100% compatible with the normal MCU like ARM AVR PIC and 8051,especially on arduino family such as arduino due and arduino mega2560(R3).The module uses the LCD controller Chip SSD1963 with 4.3 inch LCD including the touchscreen.
Use TM1638 digital tube drive chip to drive common cathode LED digital tube. Buy the module provides an example program. The electric motor protection : overload protection, wrong level protection and stall lock current protection.
ST-DM542 is a cost effective, high performance CNC two phase stepper motor driver. Using the bipolar constant current PWM current control mode that make the motor runs smoothly and quietly. The maximum output of 4.2A drive current is suitable for NEMA17 and NEMA23 stepper motor which height is less than 112mm.