Universal medical analyzer: SpO2, bpm, temperature with SD card and Wifi, NTP and MQTT
it is universal recorder that measures SpO2, bpm, 3 temperatures. It consists of afe4490 devkit, ESP32 devkit, RTC, battery charer, tiny OLED module, 2 x Nokia-type Li-On 1.3Ah batteries and SD card module. Enclosure was designed using Alibre CAD software and was 3D-printed. Time is synchronized using NTP service.