Sensors: Photocell and Temperature/Humidity Sensors

I'm testing out the sensors one-by-one for the first week (just to make sure they all work and can transmit/receive data when connected to the Arduino). The Arduino is connected to the computer by a USB cable. It's also where it draws the power (5V max).


Photocell:

Setup:

(Please excuse my terrible picture quality. Image on the left is created using Fritzing.)

The photocell is ordered from here: http://www.sparkfun.com/products/9088. Plugging the data input into the analog pin and running some code will theoretically display a value between 0 and 1023 on the computer screen. This represents voltage measured on a scale of 0V to 5V. In reality, however, if I cover the photocell, the value will drop to ~100, and if I shine a bright light on it, the value will jump to around 1000. Room value is around 870.

Current Usage: 250 mA with the 10K resistor.


Temperature/Humidity Sensor:

Setup:

The Temperature/Humidity Sensor is ordered from: http://www.sparkfun.com/products/10167. Its calibration is a bit complicated, so we used code from here to test the sensor.

Room Temperature: 24 degrees C.
Room Relative Humidity: 53%.

Current usage: 20 mA.


Humidity Sensor:
Setup:

We also ordered a humidity only sensor (http://www.sparkfun.com/products/9569). However, since humidity depends on temperature, we ended up just connecting both the humidity sensor and the temperature/humidity sensor onto the Arduino. The reading for humidity seemed to agree, which is good. It seems that it's just more efficient to use the temperature/humidity sensor, as this one doesn't seem to give us any additional information. 


The current usage seems negligible. It registered as 0 on the multimeter.