Mercury Medallion Module for Uno R3Features-    This module consists of a mercury switch, a 680Ω resistor, and a LED that will light up when tilt is detected. The mercury ball will open/close the circuit when the module is rotated    Mercury switch module and digital 13 interface comes with LED to build a simple circuit, the production of tilt lights with the digital 13 interfaces comes with the LED, the mercury tilt switch sensor access to digital 3 interfaces, when the mercury tilt switch sensor has a button signal, LED light, and vice versa...

Uno R3 CH340G ATmega328p Development Board Compatible with ArduinoFeatures-    The Uno R3 CH340G ATmega328p Development Board is the low-cost version of the popular Uno R3 Arduino. It is assembled with the CH340 USB to Serial converter chip, instead of using an Atmega16U2 chip.    We have used plenty of these low-cost Arduino boards with CH340 chips, and have found them to work perfectly. The only time the CH340 chip is used is during programming and when using the serial output of the USB port. During normal operation, this board is identical to the more expensive version without CH340 chip...