1. a few of my favorite sensors

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3. accelerometer Sparkfun SEN-09269 $14.95 retail ADXL335 accelerometer
3-axis
±3g
power using 3.3V supply
analog output of acceleration
DATA SHEET:

4. Cantherm MF52 series thermistor
void setup() { Serial.begin(9600); }
void loop() { int t=analogRead(3); // read temperature Serial.println(t); // print temperature }
Cantherm MF52 series thermistor
digikey part #: ND
resistance = 10kΩ at 25˚C
10kΩ 5V
analog pin 3 (measures voltage across 10kΩ resistor)
variation of 0 to 1023 analog value with temperature
as temperature increases, the electrical resistance of the thermistor decreases
this causes a decrease in voltage across the thermistor
this causes an increase in voltage across the 10kΩ resistor
this causes the 0 to 1023 output of the analog pin to increase with increasing temperature

5. photoresistor resistance changes with light level cost $0.89
void setup() { Serial.begin(9600); }
void loop() { int p=analogRead(4); // read light level Serial.println(p); // print light level }
photoresistor
resistance changes with light level
cost $0.89
Luna Optoelectronics PDV-P8103
16-33kohm 5V
analog input 4
photoresistor
10kW