Table 1.

Implementation cost of single prototype.

Name of component (quantity)	Price (BDT)
ESP32 (1)	450
Arduino Nano (1)	450
GSM module (1)	800
ISD1820 module (1)	150
MAX30100 Pulse Oximeter and Heart Rate Sensor (1)	250
LM35 body temperature sensor (1)	60
LCD (I2C integrated) (1)	250
DHT11 humidifier + temperature sensor (1)	100
MQ2 gas sensor (1)	100
RTC module (1)	250
IC7805 (2)	15
Buck converter (1)	100
Reed switch (9)	150
LED (10)	15
Buzzer (8)	10
Transistor (2)	5
Capacitor (1)	5
Resistor	10
Switch (1)	5
Cardboard	50
Total	3225 BDT (Approx. 32 USD)