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Atmel's ATMega1284 is an interesting alternative to other Arduino compatible processor, between the Atmega328 (UNO) and Atmega2560 (Mega). Easy to solder and use on a breadboard with its DIP package, it features 2 UART ports, 16k RAM, 128k Flash, 4k EEPROM, 32 IOs and 8 Analog inputs.
Atmel's ATMega328P 8-Bit Processor in 28 pin DIP package. Pre-loaded with the Arduino Optiboot (Uno 16MHz) Bootloader. This will allow you to use Arduino code in your custom embedded project without having to use an actual Arduino board.
This is a breakout board for the 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. This device is a low power consumption, digitally controlled analog switch. It allows you to connect up to 16 sensors to your system using only 5 pins.