Table 3.

Comparison of the current study with previous studies.

Reference	Technology	Farm type	Environmental parameters	Controller type	Earlier alarming system
54	Wireless Sensor Network	Poultry farm	Temperature	Arduino nano with XBee and UARTS Bee	No existing
11	IoT	Poultry farm	Temperature, humidity, NH3, luminosity	ESP-8266EXwith standard Wi-Fi	No existing
24	Wireless Sensor Network	Livestock Buildings	CO2, Temperature, and humidity	CC1110F32 integrated with CSV database	No existing
9	IoT	Poultry houses	Temperature, humidity, luminosity, CO2, wind speed	PLC; model: ECM6L45160 and ECI2626440	No existing
22	IoT	Poultry houses	Temperature, humidity, luminosity	Raspberry Pi with Wireless AP	No existing
55	IoT	Poultry farm	Temperature, humidity, water level	Arduino Uno	No existing
56	IoT	Animal farm	Temperature, humidity, NH3, CO2	ESP 32	No existing
57	IoT	Livestock farm	Temperature, humidity	FX3U-32MR PLC	No existing
58	IoT	Livestock farm	Temperature, luminosity	Arduino and XBee	No existing
Current study	IoT	Poultry houses	Temperature, humidity, NH3, and CH4	Arduino Mega 2650 integrated with Wi-Fi and GSM	Available