thermistors

In the past blog post we used a potentiometer to provide a user variable voltage to one of the Analog In pin. We then used the value read from the Analog In pin to set the blinking delay of an LED. This resulted in the LED which was blinking faster and slower depending on how the potentiometer was set.

Potentiometer aren't the only circuit components whose provide a variable resistance. In fact there are many others: providing a different resistance its a common behavior in most sensors.

In the Arduino Base Workshop KIT I have two components of this type: a 4,7K Ohm Thermistor and a 10..40K Ohm LDR VT90N2. Let's have a look at them.