The usual method is to use the Arduino’s analog pins to send PWM signals to the module. This lets you mix each color, giving you full control over the RGB LED. Meanwhile, the other (digital) option is ...

#define LDR A2 //Light dependent resisotr (LDR) connected to analog pin A2 #define LED 5 //LED connected to digital pin 5 int LDR_value; //variable to store result value read by LDR ...

Arduino pin A1 is used to check the analog output of MCP4725 from the pin OUT and finally display the both ADC & DAC values and voltages in the 16x2 LCD display. ... //Define LCD display pins ...