Ambient light detection and constant current source circuit diagram

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A photoresistor is a resistor which is made by utilizing the photoelectric effect of a semiconductor and whose resistance value changes with the intensity of incident light. When the incident light intensity is strong, the resistance value decreases. The background light detecting circuit is shown in Fig. 3 (left), and the collector output voltage of the transistor is input to the A/D converter. Since the high-precision 12-bit A/D DAC is integrated into the MCU, its internal A/D converter is selected. The analog input control range is 0~5V, which is stored by the MCU and its control register Sref. determine.

When the intensity of the background light is strong, the resistance of the photoresistor decreases, the triode is in a non-operating state, and the collector of the triode outputs a low level; when the background light intensity is weak, the resistance of the photoresistor increases, and the triode is in a working state. The collector output of the transistor is high. When the output is higher than the set value, the object positioning detection subsystem is turned on.

At the same time, in order to avoid the influence caused by other reasons (such as lightning, light source, etc.), the setting time of setting the street light is 30s. After the 30s, the single chip detects that the collector output of the triode is higher than the preset value, the single chip sends an object positioning detection on signal. .

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