Currently LPG (Liquid Petroleun Gas) in the form of methane / butane widely used by society. So that kerosene that used to be often used has been abandoned by society and replaced by LPG. By using this LPG many benefits can be obtained by society. For instance LPG usage is much more efficient. But there are also shortcomings that we must consider when using this LPG is in terms of security. This is because the gas is flammable so it can cause a fire / explosion. Therefore the LPG leakage controller was designed using SMS via SIM800L with MQ-2 sensor and Arduino UNO stepper motor. This tool consists of several series of sensor circuit, an arduino UNO minimum system, stepper motor driver circuit, SIM800L circuit and alarm circuit. From the research results obtained, LPG leakage controller is able to detect leakage starting from the sensor output value 32-553.
This article designs a measurement tool and an ambient temperature monitor of Broiler chicken farm at Gianyar region by applying LM35 temperature sensor as temperature detector, ATmega16 Microcontroller is functioned as the main control of the system and SIM 800L Module is functioned as SMS sender and receiver. Optimal ambient temperature of broiler chicken farm is between 16 0 C till 26 0 C [7]. The made tool will report the temperature of broiler chicken cage automatically through SMS massage if the cage temperature is less or more than optimal temperature limits. The monitoring is also done every second by sending SMS massage "Lapor" to the hand phone number that has been installed on SIM 800L module and the tool made to reply the massage is temperature report to the sender. Calibration result of sensor LM35 done at BBMKG region III Denpasar said that the uncertainty of measurements is avowed at confidence level that is not less than 95 %. Experiment result of the test equipment on broiler chicken farm at Gianyar region monitored by SMS for 4 days showed that average ambient temperature of broiler chicken cage was 28,22 0 C.
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