Manual

Photoresistor module
Working voltage: 3.3V~5V
Output type: Digital and analog interfaces. In this module, the stronger the incident light is,
the lower the output analog value is.
Interface mode: PH2.0~4P
Module size: 35*26.3mm
Module weight: 42g
Pin denifition:
DO Digital output
AO Analog output
- GND
+ VCC
Module description: Photoresistor is a kind of light controlled variable resistor.Photoresistors
have photoconductivity and can be used in photodetectors. Photoresistors are made of high
resistance semiconductors. In the dark, the resistance of photoresist can be as high as several
megaohms (m Ω), while in sufficient light, the resistance of photoresist can be as low as several
hundred ohms. If the incident light on the photoresist exceeds acertain frequency, the photons
are absorbed by the semiconductor to the bound electrons enough energy to jump into the
conduction band. The resulting free electrons conduct electricity, thereby reducing resistance.
Micro:bit
Example 1
code
8