DFRobot Screw M3x25 Low-Profile Cross-Head 10pcs - FIT0281 water quality slim controllers 8-bit AVR /

slim controllers 8-bit AVR / 16 MHz Native USB

20: Arduino I2C selection jumper

Feature CP2102 (this board) CH340 (NodeMCU V3) Driver support Excellent on all OS — often auto-installs Good — manual driver needed on some systems Max baud rate Up to 921600 baud Up to 2 Mbaud Board size Compact (V1 form factor) Wider (V3 form factor) Cost Slightly higher More affordable Best for Plug-and-play on macOS/Linux

1 × Dual H-Bridge Motor Driver for DC or Steppers 600mA L293D

Use the correct board voltage and I2C address in your code

DFRobot Screw M3x25 Low-Profile Cross-Head 10pcs - FIT0281 water quality slim controllers 8-bit AVR /These are M3 crosshead cap screw, which provides a more secure way to install circuit boards, sensors and mechanical mounting. SPECIFICATION Screw Drive Type: cross Screw size: M3 Screw length: 25 mm