The temperature of the air is the state of hot air caused by the heat of the sun. Factors that affect the amount of solar heat received by the earth are cloud, the surface plane, the angle of the sun, and the length of the sun's exposure. The heat of the earth's surface by solar radiation affects the heat of the air. Earth's surface air temperature varies because sunlight spreads unevenly on the earth's surface. The research aimed to design and implement a series of tools that can measure the ambient temperature and provide information about the environmental temperature via telegram. The methods used in this research were analyses consisting of needs analysis, and analysis of how it worked. Hardware and software implementations were also applied. The research carried out several tests, including tests on the DHT11 sensor, LED light, LCD i2c, Ethernet Shield, and Telegram test. The integration test on the LCD showed that when the temperature was below or the same as 25˚C, the green LED would be ON and the red LED OFF, which indicated that it was cold temperature. Conversely, when the temperature was the same or above 30˚C, the red LED would be ON, and the green LED OFF, indicating that the temperature was hot. The second test was to compare digital and analog sensors. The comparison values of the digital and analog temperatures were 1.1˚C, and the humidity was 23.1% RH. The highest temperature obtained from the system per day was 34˚C, and the lowest temperature was 23˚C.
Strawberry is one of the commodities of subtropical fruits growing in Indonesia. It has a high economic value, attractive appeal in a red and fresh sweet fruit. The color of a strawberry shows its maturity stages, and the strawberry maturity stages affect postharvest quality. The research aimed to design and implement a tool to approve and apply the maturity stages of strawberries using Arduino Uno and display the information on the web. The method included needs analysis and analysis of work, and the design consisted of hardware design and network design. The testing consisted of TCS3200 sensor testing, LCD testing, servo motor testing, and WEB testing. The results of this study found that when the strawberry fruit was declared mature by the TCS3200 sensor as the color detection sensor, the LCD would display the texts, and the servo would open. The system on the WEB would display the total information of the sorted strawberries.
The design and construction of a device prototype for a water level measurement system in a tank and controlling a number of garden light analogies has been carried-out and the prototype can be integrated into smarthome system. Three topics are discussed in this paper, including the manufacture, programming, and performance measurement of device prototypes. The formation of prototype of the device is done through wiring integration between electronic devices, in order to obtain the hardware handshacking. Programming the prototype of device is done through the creation of algorithms and preparation of syntax, in order to obtain the software handshacking. The performance of the prototype of device is measured when integrated into the Smarthome system, in order to obtain the hardware and software handshacking. The performance of prototype of the device when monitoring in the form of information about the water level in the water tank with 3 (three) conditions, namely the criteria of "empty", "medium", and "full", while the control in the form of information about the operation of ON/OFF of the LED as an analogy to the lamp garden are done for 3 (three) positions, namely position #1, #2, and #3. The manufactured subsystem prototype can be integrated into the smarthome system when a validation test is performed. Prototype of the device for monitoring and control based-on web that can be integrated into the smarthome system.
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