This document contains code snippets for several Arduino projects: 1) Reading analog sensor values from pin A0 and converting to Celsius and Fahrenheit temperatures displayed over serial. 2) Reading humidity and temperature values from a DHT11 sensor on pin A0 and displaying over serial. 3) Controlling a servo motor connected to pin 9 using values from an analog potentiometer on pin 0. 4) Controlling a stepper motor connected to pins 8, 10, 9, 11 using values from an analog potentiometer on pin A0. 5) Driving a DC motor forward by setting pins 6 and 7 low and high respectively. 6) Reading analog sensor values from pin A0