Module features:
1. It can detect the brightness and light intensity of the surrounding environment (compared with the photoresistor, the directionality is better, and the light source in the fixed direction can be perceived)
2. Sensitivity is adjustable (blue digital potentiometer adjustment in the figure)
3. Working voltage 3.3V-5V
4. Digital switch output (0 and 1)
5. With fixing bolt holes for easy installation
6. Small board PCB size: 3.2cm * 1.4cm

Instructions for use
1. Photodiode module is most sensitive to ambient light intensity. It is generally used to detect the brightness and light intensity of the surrounding environment. In most cases, it can be used with the photoresistor sensor module. The difference between the two is that the photodiode module has good directionality. A light source that senses a fixed direction.
2. When the module has no light condition or the light intensity does not reach the set threshold, the DO port outputs a high level. When the ambient light intensity exceeds the set threshold, the module D0 outputs a low level;
3. The small-plate digital output D0 can be directly connected to the single-chip microcomputer, and the high-low level is detected by the single-chip microcomputer, thereby detecting the change of the light intensity of the environment;
4. The small board digital output DO can directly drive the store’s relay module, which can form a photoelectric switch;