Temperature Lock Treasure Chest

This treasure chest will only unlock if it is less than 65 degrees F. There is a temperature sensor exposed to the outside, and a servo inside that moves a latch forwards or backwards to lock or unlock the treasure chest. There is also a switch outside the box to turn it on or off.
To open the treasure chest you would turn it on, then place it inside a refrigerator.

Other treasure chest ideas:
It has to be in a certain GPS location.
It has to be thrown in the air (w/ an accelerometer inside)
It has to be loud (w/ a microphone)
It has to be really bright (w/ a light sensor)


#include <ServoTimer1.h>

int TempsensorPin = 0; //the analog pin the TMP36's Vout (sense) pin is connected to
                        //the resolution is 10 mV / degree centigrade with a
                        //500 mV offset to allow for negative temperatures

int ledpin = 13;
int ledpin2 = 10;

ServoTimer1 servo1;

void setup()
  pinMode(ledpin, OUTPUT);
  pinMode(ledpin2, OUTPUT);
void loop()                     // run over and over again

// digitalWrite(ledpin, HIGH);
  //getting the voltage reading from the temperature sensor
 int reading = analogRead(TempsensorPin);  

 // converting that reading to voltage, for 3.3v arduino use 3.3
 float voltage = reading * 5.0 / 1024; 
 // print out the voltage
 //Serial.print(voltage); Serial.println(" volts");
 // now print out the temperature
 float temperatureC = (voltage - 0.5) * 100 ;  //converting from 10 mv per degree wit 500 mV offset
                                               //to degrees ((volatge - 500mV) times 100)
// Serial.print(temperatureC); Serial.println(" degress C");
 // now convert to Fahrenheight
 float temperatureF = (temperatureC * 9 / 5) + 32;
 Serial.print(temperatureF); Serial.println(" degress F");
 if (temperatureF <= 65){
   digitalWrite(ledpin2, HIGH);
     //pin 10
 } else { 
   digitalWrite(ledpin2, LOW);
 if (temperatureF <= 60){
  digitalWrite(ledpin, HIGH);
 } else {
   digitalWrite(ledpin, LOW);
 delay(1000);                                     //waiting a second

Cool box!

It has to be in a certain GPS location.

Like this? http://arduiniana.org/projects/the-reverse-geo-cache-puzzle/

Neat idea. I guess you don't live in Alaska. What do you keep locked in it?

Just make sure the battery doesn't run flat before you can open it. ;D