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Product description

Specifications

Working voltage: 3.3V or 5V

Working current : < 20mA

Operating temperature range: -10 ° C ~ +70 ° C

Detection resolution: 10%

Interface type: analog signal output

Size: 24mm x 21mm

Weight: 3g

Interface definition

S:Signal output

+:Power supply (VCC)

-:Ground (GND)

Instructions

working principle

The gradation sensor comprises a white high-brightness light-emitting diode and a photoresistor. Since the light returned by the light-emitting diode on different gradation papers is different, the photoresistor receives the returned light, and the photoresistor is different according to the intensity of the light. The resistance values are also different, thereby realizing the test of the gray value.

Programming principle

The gray level sensor has three pins, which are the power supply positive Vcc, the power supply ground GND, and the signal end S. In actual use, the sensor can be directly connected to the analog interface of the Arduino controller, for example, the analog port A0, after the Arduino is powered on, The sensor white highlight LED lights up, the sensor button is placed on different gray paper, the data is read by the AD conversion of the Arduino controller, and then the measured analog quantity is printed through the serial port.

Connection diagram

The S port is connected to the analog input pin of the controller. Connect 5V and GND to the +5V and GND of the power supply, respectively.

Sample program

Connect the grayscale sensor to the Arduino UNO controller according to the program and observe the value of the serial port output under different gray values.