DIY ECG and Pulse Oximeter with LM324 OpAmp (1 of 2)
Why the open web links it
Builds a simple ECG and pulse oximeter using an LM324 op-amp and basic components.
Linked by 3 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including sapo.pt, makezine.com, swharden.com.