Smart Whistle Counter for Pressure Cooker

The Smart Whistle Counter for Pressure Cooker relies on an Arduino Mega 2560 microcontroller to monitor, process, and display cooking progress based on acoustic and user inputs. Power is supplied by a 9V battery routed through an SPST switch to turn the system on and off. The core sensing mechanism uses an LM393 Sound Sensor Module, which captures the sharp acoustic signature of a pressure cooker releasing steam (a whistle). Because kitchen environments contain background noise, the Arduino executes an embedded C software routine featuring a moving window low-pass filter algorithm to process the sound sensor's output and reliably isolate true whistle events from ambient sounds. As each valid whistle is detected, an internal counter increments. Users interact with the device via a 4x4 Keypad to input desired target parameters, such as the total number of whistles required for a specific recipe. Real-time metrics, including the current whistle count and elapsed cooking duration, are continuously updated and rendered onto a compact 0.91-inch I2C OLED display utilizing the I2C communication protocol. Once the target whistle count is reached, the Arduino triggers an MH-FMD Active Alarm Buzzer Module to emit an audible alert, signaling that the cooking cycle is complete and preventing food from burning or overcooking.