Temperature sensor
Almost all sensors use the same analog interface. Here, we explore a very useful and fun sensor that uses the same. Temperature sensors are useful for obtaining data from the environment. They come in a variety of shapes, sizes, and specifications. We can mount one at the end of a robotic hand and measure the temperature in dangerous liquids. Or we can just build a thermometer.
Here, we will build a small thermometer using the classic LM35 and a bunch of LEDs.
Getting ready
The following are the ingredients required for this recipe:
An Arduino board connected to a computer via USB
A LM35 temperature sensor
A breadboard and jumper wires
A bunch of LEDs, different colors for a better effect
Some resistors between 220–1,000 ohm
How to do it…
The following are the steps to connect a button without a resistor:
Connect the LEDs next to each other on the breadboard.
Connect all LED negative terminals—the cathodes—together and then connect them to the Arduino GND.
Connect a resistor to each...
