Last Updated on August 29, 2022 by pg@petergamma.org Instruction & Source Code: IMPORTANT NOTE: The resolution of ADC of NodeMCU ESP8266 is 10-bit. This means, the output of ADC will be in the range of 0 to 1023. We need additionally an external analog to digital converter with at least 16 bit for research grade … Continue reading How to Make an IoT Based ECG?