hello, it's my first time on arduino help forum so i apologize if it's the wrong méthode of message sending and for my bad english.
my problème is, when start my code and when i open my monitor, the values of my lux sensor don't change even if i light the sensor, i'm asking where is the error, if the photorésistor doesn't match with multiplexor 16 to 1, or if there is a mistake in my electronical, i'm stuck since 3 days on that. please enlighten me on this subject.
code :
// Mux control pins int s0 = 8; int s1 = 9; int s2 = 10; int s3 = 11; // Mux in "SIG" pin int SIG_pin = A0; void setup() { pinMode(s0, OUTPUT); pinMode(s1, OUTPUT); pinMode(s2, OUTPUT); pinMode(s3, OUTPUT); digitalWrite(s0, LOW); digitalWrite(s1, LOW); digitalWrite(s2, LOW); digitalWrite(s3, LOW); Serial.begin(9600); } void loop() { // Loop through and read only channel 0 and channel 1 for (int i = 0; i < 2; i++) { Serial.print("Lux value at channel "); Serial.print(i); Serial.print(" is : "); Serial.println(readMux(i)); delay(1000); } } float readMux(int channel) { int controlPin[] = {s0, s1, s2, s3}; int muxChannel[16][4]={ {0,0,0,0}, //channel 0 {1,0,0,0}, //channel 1 {0,1,0,0}, //channel 2 {1,1,0,0}, //channel 3 {0,0,1,0}, //channel 4 {1,0,1,0}, //channel 5 {0,1,1,0}, //channel 6 {1,1,1,0}, //channel 7 {0,0,0,1}, //channel 8 {1,0,0,1}, //channel 9 {0,1,0,1}, //channel 10 {1,1,0,1}, //channel 11 {0,0,1,1}, //channel 12 {1,0,1,1}, //channel 13 {0,1,1,1}, //channel 14 {1,1,1,1} //channel 15 }; // loop through the 4 control pins for (int i = 0; i < 4; i++) { digitalWrite(controlPin[i], muxChannel[channel][i]); } // read the value at the SIG pin int val = analogRead(SIG_pin); // convert the value to lux float voltage = (val * 5.0) / 1024.0; float resistance = (5.0 - voltage) * 10000.0 / voltage; float lux = 500.0 / resistance; // Simplified conversion formula, you can replace it with a more accurate formula if needed. // return the lux value return lux; }
