Introduction: Arduino Thermometer (LM35 + LCD)
Step 1: Parts Needed
1 x Arduino UNO (can be any Arduino board)
1 x Breadboard
1 x USB Cable
1 x 16x2 LCD
1 x LM35 Temperature Sensor
1 x 10k Potentiometer
1 x 220 ohm resistor
1 x 9V Battery and clip (optional, for more portability)
18 x Jumper wires
Step 2: Plugging the Parts Into the Breadboard
Insert the LCD, the potentiometer and the LM35 into the breadboard. Their locations doesn't matter, place them the way you like.
Step 3: Connecting the LCD
This is the hardest part - you need to make most of the connections now. They are as follows:
LCD Pin -> Arduino Pin
4 -> 12
6 -> 11
11 -> 5
12 -> 4
13 -> 3
14 -> 2
LCD Pin -> Rail of the breadboard
1,5,16 -> GND
2 -> 5V
15 -> 5V (using the 220 ohm resistor!)
Step 4: Connecting the Potentiometer and the LM35
Here, the connections are as follows:
One of the sides goes to GND, the opposite one - to 5V. The middle pin connects to pin 3 of the LCD
See the picture above.
Please, make sure that you insert the sensor the right way! If you swap the connections, it will burn out!
Step 5: Uploading the Code
After connecting everything, plug in your Arduino to your PC and upload the code that I've pasted here. I've added a few comments to explain some of the code.
Step 6: Done!
Enjoy your handmade thermometer. Feel free to modify the code at your liking and improve the project by adding more sensors and stuff :)