SECHA: A Smart Energy-Efficient and Cost-Effective Home Automation System for Developing Countries

Table 2

Average price and current consumption of used components.

	Average price	Current consumption
ESP32	$1.80∼$3.20	Active mode: 160∼260 mA
		Modem sleep mode: 3∼30 mA
		Light sleep mode: ∼0.8 mA
		Deep sleep mode: ∼6.5 µA
		Hibernation mode: ∼4.5 µA
ESP32-CAM	$0.78∼$2.22	Maximum brightness and flash ON: 310 mA
		Flash OFF: 180 mA
		Modem-sleep mode: up to 20 mA
		Light-sleep mode: up to 6.7 mA
		Deep-sleep mode: 6 mA
SIM800 module	$2.35∼$4.99	Sleep mode: <2.0 mA
		Idle mode: <7.0 mA
		GSM transmission (avg): 350 mA
		GSM transmission (peek): 2000 mA
PIR sensor	$0.51∼$0.82	Calm output: 40 µA
		Active output: 400 µA
DHT11	$0.10∼$0.50	Active mode: 0.3 mA
		Standby mode: 60 μA
MQ2 gas sensor	$0.89∼$0.94	∼88 mA–160 mA
LDR sensor	$0.15∼$0.25	Around 0.5 mA
Buzzer	$0.10∼$0.15	Less than 20 mA
Relay module	$1.60∼$3.00	Trigger current: 5 mA
		Active mode: ∼70 mA
Solenoid lock	$1.50∼$4.75	500 mA–900 mA
Soil moisture sensor	$0.36∼$0.39	Active mode: 4.3 mA
		Sleep state: <1 mA