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Wireless door bell and alarm systems
8-channel 10-bit ADC with differential inputs
Compact form factor
LED indicator for connection status
Arduino Leonardo usb to ch340 module Wireless door bell and alarmArduino Leonardo is Arduinos first development board to use one microcontroller with built in USB. Using the ATmega32U4 as its sole microcontroller allows it to be cheaper and simpler. Also, because the 32U4 is handling the USB directly, code libraries are available which allow the board to emulate a computer keyboard, mouse, and more using the USB HID protocol! It has 20 digital input output pins (of which 7 can be used as PWM outputs and 12 as
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