【P2009002】Photoresistor sensor module

Module functions:

1. Photoresistor sensor module, sensor: photoresistor;
2. 3.3V-5V power supply;
3. With DO switch signal (TTL) output and AO analog signal output;
4. The TTL valid signal bit is low level. When the output signal bit is low level, the signal light is on. It can be directly connected to a microcontroller or relay module;
5. The voltage of analog output, the higher the brightness, the lower the voltage;
6. Green LED light-emitting diode power indicator light;
7. Circuit board size: 22mm×40mm;
8. Model: TR0

Jiali bandage, the effect is still great.

Welded sample

circuit analysis

The photoresistor feeds back the intensity of light to the change in resistance value: the stronger the light, the smaller the resistance, the smaller the corresponding partial voltage value, and the smaller the AO; the weaker the light, the larger the resistance, and the corresponding partial voltage value The larger, the larger the AO; the following MCP6002 functions as a comparator, when the AO voltage is greater than the voltage of pin 2, pin 1 outputs high level, Q1 is turned on, DO outputs low level, and LED2 lights up; when the AO voltage is less than the voltage of pin 2 , pin 1 outputs low level, Q1 does not conduct, DO outputs high level, and LED2 light does not light up.