This post shows how to read NTC temperature sensors with Arduino UNO.
A video and code on how to control a fan with PWM and Arduino UNO.
A video on how to manipulate/control analog IO with Arduino UNO.
Learn how to manipulate/control digital IO with Arduino UNO.
Learn how to use TCS230 color sensor with Arduino and RGB LED.
An Arduino-based datalogger with four inputs and saving to microSD card