It's a photoresistor (referred to as such in the article), sometimes called an LDR (light dependent resistor). Together with the 47K R it forms a voltage divider, which is read by the ADC of the Arduino.
These are commonly made from cadmium sulfide (CdS), and are easy to find on the web--or in old light sensing nightlights or security lamps.
Comments
8 years ago
It's a photoresistor (referred to as such in the article), sometimes called an LDR (light dependent resistor). Together with the 47K R it forms a voltage divider, which is read by the ADC of the Arduino.
These are commonly made from cadmium sulfide (CdS), and are easy to find on the web--or in old light sensing nightlights or security lamps.
Answer 8 years ago
Thankx a mill!