For just a couple of bucks and a few components you have laying around your work area you can build a min thermometer than fits in your pocket. The whole circuit sits nicely right on top of a 9v battery, and is connected to it with double sided tape. Changing batteries was never so easy!
I hope you enjoy the project and vote it for the contests!
Step 1: Mini Thermometer Demonstration
In case you were wondering why the LEDs are flashing multiple times on each flash it's because I'm using PWM to power the pins.
Step 2: Ingredients:
- Three bananas with hot sauce
- Arduino (of course!)
- Breadboard and jumper wires!
- 8 DIP socket
- Temperature sensor (I'll be using the LM35)
- 3 LEDs(Preferable different colors with appropriate resistors)
- 9v battery and clip
- Perf board
- LM7805 5v regulator (Instead of using a 9v batt and a regulator you can use a 3v battery or 3 AAA)
- 1 small pushbutton
- 1 small on/off latching button
- 10k ohm resistor
- Dremel (or other tool to cut perf board)
- Soldering gun and solder
- Wire cutters & strippers
- Double Sided Tape
Step 3: Schematic & Files
Here is the sketch I will be running. I will be talking about it a little later.