Experiments included: Light a LED, flash running lights, sound a buzzer, Display numbers by digital tube, use the DHT11 sensor to measure temperature and humidity simultaneously, and use the buzzer to tweet Do, Re, Mi, Fa, So, La, Si, Do. etc.///// Tutorial Content: Lesson 0 What is A_rduino Lesson 1 Blink Lesson 2 LED Lesson 3 RGB LED Lesson 4 Push Button Lesson 5 Active Buzzer and Potentiometer Lesson 6 Passive Buzzer Lesson 7 Eight LED with 74HC595 Lesson 8 The Serial Monitor Lesson 9 Photoresistance Lesson 10 LED Segment Displays Lesson 11 Servo Lesson 12 DHT11