Mohd Redzuan, Ahmad Afif Aiman, Faiz Asraf Saparudin, Nor Shahida Mohd Shah, Muhammad Mirza Amsyar Noor Azeb, and Muhamad Khairi Azizi Shamsuddin. 2021. “Wireless Ammonia Sensor System for Distributed Wireless Monitoring Platform Using Heltec Wifi LoRa 32 (V2)”. Progress in Engineering Application and Technology 2 (1):502-13. https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/910.