Light Sensor

This circuit is based on the ARDX 09 circuit from Oomlout.  It shows how the Arduino can monitor light values using a Photo Resistor and adjust a LED in response. 

Start by gathering your parts together:

• 1 x Arduino Uno
• 1 x Breadboard
• 1 x LED
• 1 x 560 Ohm Resistor (Green-Blue-Brown)
• 1 x Photo Resistor
•  1 x 10K Ohm Resistor (Brown-Black-Orange)

Step 1:  Create the circuit

Step 2 – Write the code

Temperature Sensor

You can also use this same circuit to measure temperature with some subtle changes.  I used the Adafruit guide to help me and also remembered to look at the data sheet for my thermistor.