This paper presents a cost-conscious signal processing pipeline for detecting heartbeats from faint body vibrations using a single back-mounted inertial measurement unit (IMU). The system operates without ECG or PPG sensors, relying solely on accelerometer and gyroscope data. The pipeline is designed with the intent to run on lightweight edge-computing platforms, such as Raspberry Pi-class devices or even on a ESP32, while prioritizing energy efficiency and user-friendliness for extended battery-powered use. Preliminary validation against manually recorded heart rates demonstrates feasibility with limitations.