SF66 Perancangan Sistem Pengkondisi Sinyal Sensor Suhu LM35 Berbasis LM358 untuk Monitoring Temperatur Ruang Server
Perancangan Sistem Pengkondisi Sinyal Sensor Suhu LM35 Berbasis LM358 untuk Monitoring Temperatur Ruang Server
Keywords:
LM35 sensor; non-inverting amplifier; low pass filter; LM358; signal conditioning; server room temperatureAbstract
Server room temperature is a critical parameter that must be continuously monitored because uncontrolled temperature rise can reduce the reliability of the electronic equipment inside it. The LM35 temperature sensor produces a very small output voltage of 10 mV/°C, so it cannot be directly processed by a data acquisition system without a signal conditioning process. This research aims to design and test a signal conditioning circuit based on a non-inverting amplifier and a low pass filter using the LM358 IC for server room temperature monitoring applications. The non-inverting amplifier was designed with a gain of 10 using Rf = 90 kΩ and Rg = 10 kΩ, while the low pass filter was designed with a cutoff frequency of approximately 100 Hz using R = 15.9 kΩ and C = 100 nF. Testing was carried out through simulation using Proteus software and hardware implementation over a temperature range of 24-28°C. The results show that the output voltage increases linearly with temperature rise, both in simulation and hardware results, with an average percentage error of 0.63%. These results prove that the designed signal conditioning circuit works in accordance with theoretical calculations and is feasible to be implemented for a server room temperature monitoring system.
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