Abstract:
Monitoring soil moisture and pH levels is crucial for tracking the health of plants. Therefore, it is necessary to develop a device for measuring soil moisture and pH with the aim of plant monitoring. This device utilizes Long Range technology and consists of two nodes that monitor two different soil parameters: soil moisture and pH levels. Test results indicate that this device is capable of measuring soil moisture with the smallest error rate of 0.0254% and pH levels with the smallest error rate of 0.29%. Monitoring data is transmitted via LoRa technology with a range of up to 400 m, and the testing results successfully detected RSSI and SNR values. For Node A, the average RSSI value was -113.6 dBm, and the average SNR value was -2.55 dB. Meanwhile, for Node B, the average RSSI value was -116.6 dBm, and the average SNR value was 2.35 dB. Data can be accessed through a website using Firebase services.
INTRODUCTION:
As an agricultural country, Indonesia has enormous potential in agriculture. This can be seen from the large number of Indonesian people who work in the agricultural sector. In February 2021, the Central Statistics Agency (BPS) obtained data on 38.78 million people or 29.59% of the total working Indonesian population (N. Mukhayat, P. W. Ciptadi, and R. H. Hardyanto, 2021). In terms of percentage, agriculture is one of the most dominant sectors in people's income in Indonesia because the majority of Indonesia's population works as farmers. But until now agricultural productivity in Indonesia is still far from expectations. One of the factors causing the lack of agricultural productivity is low human resources in cultivating agricultural land and its results
(Sari, 2021).
Agriculture plays a vital role in the economy, and maintaining soil health is crucial for sustainable farming. Traditional methods of soil monitoring are manual and time-consuming. The integration of IoT (Internet of Things) and wireless communication has revolutionized agriculture, allowing farmers to monitor their fields remotely.
LoRa technology provides long-range, low-power wireless communication, making it ideal for remote agricultural monitoring systems. This project integrates soil moisture and pH sensors with LoRa communication modules to develop an efficient soil monitoring system.

Objectives:
• To design a soil monitoring system using soil moisture and pH sensors.
• To implement LoRa communication for long-distance data transmission.
• To analyze the performance of data communication over LoRa.
• To evaluate the accuracy and reliability of soil moisture and pH sensors.