For a home made escape room, I am trying to check if 3 sets of two pins are connected.
It works for the first two, but not the 3rd, and I don't understand why.
The basics: players have a 3x3 grid with end points. They have to connect 3 pairs together correctly in order to unlock something.
For this I have 3 emitter pins and 3 receiver pins. To avoid problem if players connect 2 emitters together I turn them on and off one at a time.
For some reason receiver3 is always LOW.
What am I doing wrong ?
Here is the code:
#define emitter1 10
#define emitter2 11
#define emitter3 12
#define receiver1 A0
#define receiver2 A1
#define receiver3 A2
#define diodeRed 3
#define diodeGreen 4
int val1;
int val2;
int val3;
void setup() {
Serial.begin(9600);
pinMode(emitter1, OUTPUT);
pinMode(emitter2, OUTPUT);
pinMode(emitter2, OUTPUT);
pinMode(receiver1, INPUT);
pinMode(receiver2, INPUT);
pinMode(receiver3, INPUT);
pinMode(diodeRed, OUTPUT);
pinMode(diodeGreen, OUTPUT);
// initial state
digitalWrite(diodeRed, HIGH);
digitalWrite(diodeGreen, LOW);
}
void loop() {
// reads first pair
digitalWrite(emitter1, HIGH);
delay(100);
val1 = digitalRead(receiver1);
delay(100);
digitalWrite(emitter1, LOW);
// reads second pair
digitalWrite(emitter2, HIGH);
delay(100);
val2 = digitalRead(receiver2);
delay(100);
digitalWrite(emitter2, LOW);
// reads third pair
digitalWrite(emitter3, HIGH);
delay(100);
val3 = digitalRead(receiver3);
delay(100);
digitalWrite(emitter3, LOW);
Serial.print("val1:");
Serial.print(val1);
Serial.print(", val2:");
Serial.print(val2);
Serial.print(", val3:");
Serial.print(val3);
Serial.println("");
// quantum diode set
if (val1 == HIGH && val2 == HIGH && val3 == HIGH) {
digitalWrite(diodeRed, LOW);
digitalWrite(diodeGreen, HIGH);
} else {
digitalWrite(diodeRed, HIGH);
digitalWrite(diodeGreen, LOW);
}
}
And here is the circuit diagram (attached):
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