HVAC Control system Alternative to PLC using Arduino Nano

• Design HMI on 4X20 LCD for users interaction, it has multiple pages for monitoring operations, Alarms, and control.

• Enabled interrupts on all inputs for quick response, halting the compressor to prevent issues.

• Utilized an Alarm flag to ensure the system stays inactive till the alarm is resolved and reset.

• Utilized EEPROM for storing system settings and alarms.