int ud_angle = 10;//set the initial angle to 10 degree;keep the solar
panels upright to detect the strongest light
int l_state = A0;//define the analog voltage input of the photoresistors
int r_state = A1;
int u_state = A2;
int d_state = A3;
const byte buzzer = 6; //set the pin of the buzzer to digital pin 6
const byte lr_servopin = 9;//define the control signal pin of the servo
rotating right and left
const byte ud_servopin = 10;//define the control signal pin of the servo
rotating clockwise and anticlockwise
unsigned int light; //save the variable of light intensity
byte error = 15;//Define the error range to prevent vibration
byte m_speed = 10;//set delay time to adjust the speed of servo;the
longer the time, the smaller the speed
byte resolution = 1; //set the rotation accuracy of the servo, the
minimum rotation angle
int temperature; //save the variable of temperature
int humidity; //save the variable of humidity
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