ARCHBOLD, G. W. R1 R2 pH Measurement IoT System for Precision Agriculture Applications. IEEE Latin America Transactions, [S. l.], v. 17, n. 5, p. 823–832, 2019. Disponível em: https://latamt.ieeer9.org/index.php/transactions/article/view/1094. Acesso em: 19 jan. 2022.