<>Arduino Photosensitive sensor control LED Lamp brightness
Goal one ：
Through photosensitive sensor , bring LED The brightness is automatically adjusted according to the ambient brightness , Low ambient brightness LED The light is brighter
Photosensitive sensor ：
The photosensitive sensor has four ports ：
AO： Analog signal output
DO：TTL Switch signal output （ When the brightness is greater than the set value DO Output low level , Conversely, output high level ）
Circuit diagram ：
—— There is no connection here DO port ——
Related code ：
int value; // Store the brightness value of the electric lamp after passing through the photosensitive sensor void setup(){ Serial.begin(9600);
pinMode(4,OUTPUT); //4 The pin is the output pin } void loop(){ value=analogRead(A0)/4;
analogWrite(4,value); }
design sketch ：
Goal two ：
Using serial port monitor control LED Lamp mode ：
* A. Night light mode （LED Low lamp brightness ）
* B. Reading mode （LED High lamp brightness ）
* C. Adaptive mode （LED Lamp brightness adaptation ）
code ：
int mode; // define mode ( pattern 0： Reading mode pattern 1： Night light mode pattern 2： Adaptive mode ) int value; // Store the brightness value of the electric lamp after passing through the photosensitive sensor
void setup(){ Serial.begin(9600); pinMode(4,OUTPUT); } void loop(){ char
LED=Serial.read(); //LED Read input if(LED=='A') // Judgment mode mode=0; else if(LED=='B')
mode=1; else if(LED=='C') mode=2; value=analogRead(A0)/4; control(); // call contol
} void control(){ // Three kinds LED Lamp mode if(mode==0){ analogWrite(4,255); } else
if(mode==1){ analogWrite(4,90); } else if(mode==2){ analogWrite(4,value); } }
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