First init.

pontiac_relay/pontiac_relay.ino

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+// Constants for input pins
+const int parkPin = 2;
+const int intermittentPin = 3;
+const int lowPin = 4;
+const int highPin = 5;
+
+// Constants for output pins
+const int lowRelayPin = 6;
+const int highRelayPin = 7;
+const int intermittentRelayPin = 8;
+const int earthRelayPin = 9;
+
+// Variables to store input states
+int parkState = LOW;
+int intermittentState = LOW;
+int lowState = LOW;
+int highState = LOW;
+
+void setup() {
+  // Set input pins
+  pinMode(parkPin, INPUT);
+  pinMode(intermittentPin, INPUT);
+  pinMode(lowPin, INPUT);
+  pinMode(highPin, INPUT);
+
+  // Set output pins
+  pinMode(lowRelayPin, OUTPUT);
+  pinMode(highRelayPin, OUTPUT);
+  pinMode(intermittentRelayPin, OUTPUT);
+  pinMode(earthRelayPin, OUTPUT);
+
+  // Initialize relay states
+  digitalWrite(lowRelayPin, LOW);
+  digitalWrite(highRelayPin, LOW);
+  digitalWrite(intermittentRelayPin, LOW);
+  digitalWrite(earthRelayPin, HIGH);
+
+  // Initialize serial communication
+  Serial.begin(9600);
+}
+
+void loop() {
+  // Read input states
+  parkState = digitalRead(parkPin);
+  intermittentState = digitalRead(intermittentPin);
+  lowState = digitalRead(lowPin);
+  highState = digitalRead(highPin);
+
+  // Check conditions and set relay states
+  if (parkState == HIGH) {
+    digitalWrite(lowRelayPin, HIGH);
+    digitalWrite(highRelayPin, HIGH);
+    digitalWrite(earthRelayPin, LOW);
+    digitalWrite(intermittentRelayPin, LOW);
+  } else if (intermittentState == HIGH) {
+    digitalWrite(lowRelayPin, HIGH);
+    digitalWrite(highRelayPin, HIGH);
+    digitalWrite(earthRelayPin, LOW);
+    digitalWrite(intermittentRelayPin, HIGH);
+  } else if (lowState == HIGH) {
+    digitalWrite(lowRelayPin, HIGH);
+    digitalWrite(highRelayPin, HIGH);
+    digitalWrite(earthRelayPin, HIGH);
+    digitalWrite(intermittentRelayPin, LOW);
+  } else if (highState == HIGH) {
+    digitalWrite(lowRelayPin, LOW);
+    digitalWrite(highRelayPin, HIGH);
+    digitalWrite(earthRelayPin, HIGH);
+    digitalWrite(intermittentRelayPin, LOW);
+  } else {
+    // Default state: all relays off
+    digitalWrite(lowRelayPin, LOW);
+    digitalWrite(highRelayPin, LOW);
+    digitalWrite(earthRelayPin, LOW);
+    digitalWrite(intermittentRelayPin, LOW); }
+  // Print input states (for debugging)
+  Serial.print("Park: ");
+  Serial.print(parkState);
+  Serial.print(" Intermittent: ");
+  Serial.print(intermittentState);
+  Serial.print(" Low: ");
+  Serial.print(lowState);
+  Serial.print(" High: ");
+  Serial.println(highState);
+
+  delay(100);  // Delay for stability
+}