Development of’ Trainer Sensor as Media Learning Control Systems for Engine Cadets at Politeknik Pelayaran Surabaya Desenvolvimento do sensor de treinamento como sistemas de controle de aprendizado de mídia para cadetes de motores na Politeknik

The purpose of this research was designed to: (1) develop sensor trainers that fit the needs of the control system subjects (2) develop sensor trainer with good performance, and (3) test the feasibility of sensor miner as media learning for control system learning at Surabaya Merchant Marine Polytechnic. This study was a Research and Development (R&D) in the field of education. The development research model used was ADDlE: Analysis, Design, Development, Implementation, and Evaluation. The instrument used in this study was a questionnaire with a four answer Likertscale. The validity test of the instrument was carried out by consulting with material experts and media experts. Instrument reliability was calculated using the alpha formula and produced a reliability value of 0.87 (very reliable). There are three aspects measured at this implementation stage, namely aspects of material quality, media operations, and learning aspects. The results obtained were for the quality of the material got a percentage of 78.76°/c, for media operations got 68,77°/c, and for learning got a percentage of 76.35°/c. Of the three percentages, a total percentage of 76,62°/c was obtained, so that the media trainer censor was declared feasible to be used as a learning media for the control system course after the feasibility test was conducted by theuser.


INTRODUCTION
The development of automation technology in the current era of globalization growing rapidly. The development of this automation technology is very useful and helpful for the community. One technology product Today's automation is the existence of a smart home, where one can monitor room conditions and control electronic equipment in the house using a computer or smart phone. Improving the quality of human resources can be started from the field education. Education is an appropriate and effective means for introduce technology and its development to students. In every formal education, learning has several basic competencies that must be achieved. Basic competenciesit is written in the syllabus contained in each subject. These basic competencies are goals that must be achieved in every learning activity.

Research and Development
There are many development research models, one type development research models that are often used in the field education is ADDIE. According to EndangMulyatiningsih (Mulyatiningsih, 2011) 2) Making instruments to measure product performance.
d. Implementation 1) Start using new products in learning that is real 2) Look back at the goals of product development, interaction between students and ask for feedback early in the process evaluation.
e. Evaluation 1) Look back at the impact of learning in a critical way 2) Measuring the achievement of product development goals.
3) Looking for any information that can make students achieves resultswell.

Learning Media
According to Kemp and Dayton in Daryanto (Daryanto, 2010)  e. The quality of learning can beimproved.
f. The learning process can take place anytime and anywhere isrequired.
g. Positive attitude of students towards learning materials and processes learning can be improved.
h. The teacher's role changes in a positivedirection

Sensor Trainer
Sensor trainer is one of the learning media interactive, because students are required to interact with in the use of these sensor trainers. Students will interact with the trainer uses the help of the job sheet that has been provided. The sensor trainer consists of three parts, namely the sensor section, controller, and output. The sensors used in this sensor trainer, namely the LM35 temperature sensor, For parts the controller used microcontroller arduinouno. Whereas for the output section is an LCD, LED, buzzer, and DC motor. increase. This LM35 sensor has a scale factor of l0mV /˚C, so that will happen an increase in output voltage by 10 mV each there temperature increases of 1˚C.

b) Atmega328
Atmega 328 is Atmel's micro controller output a member of the 8-bit AVR family. This micro controller has a flash capacity (program memory) of 32 Kb  of analog input, using crystal 16MHz include pins A0 to A5, USB connections, power jacks, headers ICSP and reset button. That is all that is need to support a microcontroller circuit. Specifications ArduinoUno R3 can be seen in Table 1 and ArduinoUno R3 can be seen in Figure. LCD is widely used as a display of electronic devices such as calculators, digital multitester, and digital clock and so on.

A. DevelopmentModel
The Designing product concepts at this stage the authors designed the work diagram of the trainer the sensor. Sensor trainers must be able to help students in achieve basic competencies of analog and digitalinput-output. b.
Designing product manuals and jobsheets in accordance with the learning objectives. The manual contains the procedures for using the trainer thesensor.
Make products in accordance with the product concept design. This step is the development of a media sensor trainer to support the learning process that has been prepared. Following an electronic trainer sensordesign: 1) Minimum system circuit The minimum system circuit consists of a supply chain minimum power and circuit arduinouno. The power suppl y for this circuit is on will later be distributed to the entire series used. All ports on the arduinouno are connected to the pin housing female to provide full access to trainer users the sensor.

2) LM35 Circuit
The LM35 series consists of female pins for LM35 and pins female for LM35 and arduinouno connections. LM35 is sensors that are read in analog, so toaccess it uses arduinouno, which has features ADC (Analog to Digital Convener). To access it VCC, GN D, and data pins are required. Figure 1 is image circuit of the LM35 sensor. ATmega328 can be used to access this series. Figure 3 is a 16x2 LCD image series on the sensortrainer. The DC motor output circuit can be accessed digitally or analog. If accessed digitally, then all PORT ATmega16 can be used to access the circuit this. But if it is accessed analogically then the port can used to access a DC motor circuit is a port which has PWM facilities. By accessing the circuit DC motor analog we can adjust the motor speed the.
In this DC motor circuit there is a transistor BD 139 functions as a switch. Figure 6 is Pictures of DC motor circuits on the sensor trainer: Página | 2128

Implementation
After learning resources were made and declared feasible by material experts and media experts, then the application phase was carried out learning process. The implementation phase was carried out for engine cadets at Surabaya Merchant Marine Polytechnic. Implementation phase conducted to determine the feasibility of the sensor trainer in the process learning. At this stage cadets were given the user questionnaire used to measure the eligibility of trainersthesensor.

Evaluation
There were two stages of evaluation conducted in this study. The first evaluation was done after the researchers got the results of the test validation was done by material experts and media experts. The result of the test validation was then used as a reference for conducting improvements to the sensor trainer.
The second evaluation phase was carried out after researchers obtain data at the implementation stage. Data from the questionnaire was processed and used to measure the trainer's eligibility the sensor.

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The questionnaire method was conducted by giving a questionnaire contains items of statement to respondents to assess the media learning that has been made. In this study the respondents are material experts, media experts, and users. Questionnaire to assess the feasibility of a sensor trainer arranged using a scale likert four choices. The use of a four choice Likert scale will be more maximum compared to five choices, this is due because the four choice Likertscale triggers respondents to answer more assertive because there is no hesitant / neutral choice.

Data Collection Tools
According to Sugiyono (Sugiyono, 2016b)  Of steps and from the relevant research readings, a grid was obtained instrument as follows: a.

Instrument for materialexperts
Instruments for material experts are used to assess the feasibility of the sensor trainer in material terms. b.

Instrument for mediaexperts
Instruments for media experts are used to judge the feasibility of the sensortrainer in terms of learning media. The experts the media are lecturers or teachers who are experts in the field of medialearning.

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that is also with statement items on the media expert questionnaire and the user.
Validity test is done by holding consultations to the expert judgments.

Instrument Reliability Test
Reliability Tests are carried out to determine the level of reliability instruments used for data collection. Instrument declared reliable if the instrument used to measure an object the same time many times it will still produce data the same (Sugiyono, 2016a). Instrument reliability testing can be done using Cronbach's alpha formula.

Feasibility Test
Learning media products that have been implemented in form of the finished product is then tested for the product's suitability. Questionnaire used has four choices, namely: StronglyAgree, Agree, Disagree, and Strongly Disagree. These choices arequalitative data, to transform into quantitative data used grading 4 gradations that is 4,3,2,1.

RESULTS AND DISCUSSION
A.

Sensor Trainer Performance
Testing product trials are conducted to find out whether the media learning can work according to product design ornot. Testing is done by making a program for each series of inputs and outputs on the sensor trainer.
Followingis a description of the tests that have been carried out: a.
Testing the Buzzer OutputTesting the buzzer output is done bycreating a program which sounds the buzzer for 3 seconds then silence for3seconds. b.
LED Output TestingLED output testing is done by creating a program Sequential LEDs. In thisprogramtheLEDwilllightoneafteranotheronewithanintervalofonesecond. c.

Testing the DC MotorOutput
Testing the DC motor output is done by making DC motor speed control program. In this program created motor speed will increase by 50 PWM each

16x2 LCD OutputTesting
Testing the LCD output is done by making a program which displays letters, numbers and symbols on the 16x2 LCD. In the program the writing cursor on the LC D is placed on the 5th column and the 0th row of the l6x2 LCD with the command"Ledgotoxy(5.0);" e.

Testing the LM35Sensor
Input LM35 Sensor input testing is done by making a program that displays ADC data generated from temperature reading by the LM35 sensor. To display ADC data 16x2 LCD is used. To increase the temperature on the LM35 sensor, then the LM35 sensor is brought near a heater. OnThis test LM35 temperature sensor has a temperature change linear when brought near the heater.

Description of Material Validation Data
Result of data calculation for the material quality aspect was 82.03% and aspects of expediency of 90.63%. From the aspects, it also obtained a total percentage of 86.33%. From the calculations above, the average total score is obtained amounted to 3.45 and the percentage of total score was 86.33%. From the resultsit was concluded that the sensor trainer was declared "VERY WORTH" viewed from the material validation test.

Media Validation Data Description
Media validation test was done to assess the sensor trainer seen front point of view of learning media. Media validation is done with giving questionnaires to lecturers who are experts in the field of media learning and teaching subjects. Assessment results by Media experts are 82.64%, aspects of operation amounted to 82.81%, and aspects the benefit of the media is 86.98%.
From these aspects to obtained a total percentage of 84.14%. From the calculations that have been made, the average total score is obtained amounted to 3.37 and the percentage of the total score was 84.14%. From the result sit was concluded that the sensor trainer was declared" VERY WORTH "viewed from the media validation test.

Analysis of Implementation Data
The implementation took place at Surabaya Merchant Marine Polytechnic and the following were the result was found that a percentage of 77.87% in aspects material quality, 69.12% for media operations, and 78.73% for learning. It also obtained an average total score of 3.01 with a percentage of 75.24%. With these results, the trainer the censor was declared "DECENT" as a learning media for the control system course at Surabaya Merchant Machine Polytechnic.

C.
Product Review

Electronic sensor trainer
The following was an explanation of the electronic circuits contained on the sensor trainer: a) Minimum system The minimum system was the main controller of the trainer thesensor.
The minimum system used Arduino Uno. At this minimum system the power supply produced from an adapter of 5V was channeled through the DC jack connector. There was also a minimum system port for delivering power to input and output circuit.

b) Buzzer Output Circuit
To turn on the buzzer use one transistor NPN 9014 type that functions as a switch. There were three pins in the buzzer output circuit, namely pin The manual was used to simplify the operationsensor trainer by the user.
In the censor trainer's manualthere is also an initial explanation about the Arduinounornicrocontroller.

Jobsheet
Jobsheets were used by the cadets to help in the process sensor trainer operation. Jobsheet creation was sorted based on basic competencies to be achieved. The order starting from digital output programming, analog output, digital input, and the last is analog input.

DISCUSSION OF RESEARCH RESULTS
This discussion describes the answers to problems that have been formulated in the formulation of the problem. The formulation of the problem will beansweredin withthe processes and data carried out during thestudy.

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In this program created the speed of the motor will increase every three seconds,after the speed reaches maximum, the DC motor will stop for three seconds. The DC motor testing program is running repeatedly. In this test a DC motor can workwell.

d. 1 6x2 LCD Output
Testing the LCD output is done by making a program which displays letters, numbers and symbols on the 16x2 LCD.ln this test 1 6x2 LCD can function in accordance with program created.eg.
e. Testing theLM35 Sensor InputLM35 Sensor input testing is done by making a program that displays ADC data generated fromtemperature reading by the LM35 sensor. To display ADC data 16x2 LCD is used. In this test the LM35 temperature sensor can function in accordance with its working principle. 3. What is the level of eligibility of the sensor trainer as media learning at control system subject at engine department of Surabaya Merchant Marine Polytechnic?
The level of eligibility was measured using instruments has been consulted by experts. There were three types of questionnaires there were instruments to test the feasibility of the media trainer the sensor. The questionnaire was in the form of a questionnaire for material validation,media validation, and questionnaires for users.

a. MaterialValidation
Material validation was carried out by two material experts competent in the field of control system subject. There were two aspects measured in this validation, namely the quality of the material, and expediency. Media trainer sensors on the aspect of material quality get a percentage of 82.03% and 90.63% in the aspect of expediency. From these two aspects, a total percentage was obtained 86.33%, thus the media censor trainer was stated "VERY WORTH" was used in control system subject at engine department of Surabaya Merchant Marine Polytechnic.

b. Media Validation
Media validation was done by lecturers and teachers who competent in the field of learning media. There were three aspects measured in this validation, i.e. media design, operation andexpediency of the media. Media