PPGWeaver: Diffusion-Augmented Models for Real-Time Heart Rate Estimation on Microcontrollers. - Vinayak Narasimhan; Raimi Shah; Shubhankar Agarwal; Sai Shankar Narasimhan; Shailabh Kumar; Sang Kyu Kim; Sandeep Chinchali; Radwanul Hasan Siddique (BSN, 2025)