Tone Output using Arduino

Can't tell if this is actually working or just squeaking in response to being jostled...
A couple of factors that might be at fault-

• I am using a 16 ohm speaker rather than an 8 ohn speaker
• One of the photocell sensors that I'm using looks different than those pictured on the couse site (its bigger?) 

Also, I should mention that I'm looking at the numbers stream downwards in the serial monitor onscreen but I can't tell if the sensors are having any effect on them?

Week 4: Analog Input!

This is my first attempt at running analog input through the arduino. The variable resistance of the potentiometer is represented by the dimming and brightening of the bulb and was also displayed onscreen, as a scrolling number sequence in the arduino serial monitor.

Week 3 Lab!
Input/Output

This is my first program running on the arduino, it features a rotating cast of not one but TWO leds, changing according to the position of a a push button.

For my next trick I replaced the switch with a coke can. BRILLIANT!