This paper is telling about one very very nice, very cheap, very portable health monitoring system, so good for checking heart rate, SpO2, and body temperature, all in real- time, no? We are using MAX30100 sensor for pulse and oxygen level, LM35 sensor for temperature checking, both working very nicely, no problem. All data is going to ATmega328P microcontroller, like brain of device, and we are showing it on 16x2 LCD using I2C protocol, very simple, very fast, very clear. Also, we are sending this data wirelessly to phone or laptop using ESP8266 Wi-Fi module via UART, so easy, no wires hanging. This system is open-source, means free code for all, so very cheap, not like those costly medical machines costing lakhs and lakhs. It is very reliable, so easy to carry in pocket or small bag, and very very useful for homes, small clinics, villages, or anywhere big equipment is not there, too expensive, no way. Anybody can use it, like uncles, aunties, or people with no technical knowledge, just put finger on sensor, see results on LCD or phone, done, very simple, no tension.