// Define Relay Input Pins const int relay1 = 2; const int relay2 = 3; const int relay3 = 4; const int relay4 = 5; void setup() // Initialize digital pins as outputs pinMode(relay1, OUTPUT); pinMode(relay2, OUTPUT); pinMode(relay3, OUTPUT); pinMode(relay4, OUTPUT); // Turn all relays OFF initially (Active-Low Logic) digitalWrite(relay1, HIGH); digitalWrite(relay2, HIGH); digitalWrite(relay3, HIGH); digitalWrite(relay4, HIGH); void loop() // Turn Relay 1 ON, wait 1 second, then turn OFF digitalWrite(relay1, LOW); delay(1000); digitalWrite(relay1, HIGH); // Turn Relay 2 ON, wait 1 second, then turn OFF digitalWrite(relay2, LOW); delay(1000); digitalWrite(relay2, HIGH); // Turn Relay 3 ON, wait 1 second, then turn OFF digitalWrite(relay3, LOW); delay(1000); digitalWrite(relay3, HIGH); // Turn Relay 4 ON, wait 1 second, then turn OFF digitalWrite(relay4, LOW); delay(1000); digitalWrite(relay4, HIGH); delay(2000); // Pause before repeating the sequence Use code with caution. Troubleshooting Common Simulation Issues
: Completely close and reopen the application to force the system to index the new additions. Hardware Pin Mapping and Architecture 4 channel relay module library for proteus new