Design of Wireless Engine Diagnostic Tool with Raspberry Pi for Learning Media Vocational Education Teacher Candidates

Practical learning is an important activity to improve the skills of prospective vocational education teachers. Supporting facilities have an essential role in the implementation of the practice. This study aims to analyze the learning media's needs for making wireless engine diagnostic tools with raspberry pi . The method used in this research is ADDIE. This research only reached the design stage. This study focuses on the needs analysis used in the development process. The research sample is in the form of an application layout design that will be developed. The instrument in this study was an assessment sheet in the form of a questionnaire regarding the feasibility of the design. Experts in the field of application development assess designs. Developing a wireless engine diagnostic tool with raspberry pi is needed to support learning for prospective vocational teachers. The design of learning media Design of the Wireless Engine Diagnostic Tool with Raspberry Pi can be developed for practical learning of vocational students. The results of the media feasibility test by media experts can be categorized as "very feasible" to continue at the development stage.


INTRODUCTION
Engineering vocational learning in Indonesia is growing significantly [1].So, the need for vocational education teachers to supply teachers in vocational high schools is the current focus.Vocational teacher candidates are prepared to become competent teachers.Changes in the learning scheme are thought to be detrimental to the learning process, particularly student learning outcomes [2][3].Vocational education has the advantage of specific job-appropriate skills, which can make workers better prepared for the jobs they get and make them more productive.
The beginning of integrated efforts to develop vocational education in Pelita V is the first milestone in developing integrated vocational education in Indonesia [4].

RESULT AND DISCUSSION
This Furthermore, the results of the assessment by experts are in the table 3 below.Based on the calculation results in table 3 above, it can be concluded that the results of

REFERENCES
Number 29 of 1990, there are 3 articles as a basis for developing vocational education [5].Another effort is the cooperation of vocational education with the world of business and industry.Implementing dual system education through the "Link and Match" is a historic milestone for the government's initial efforts to involve industry in vocational education.Then with the establishment of the National Vocational Education Council (MPKN) and the formation of MPKN for the provinces.After the reformation order, the strategy for developing vocational education is to develop quality and relevance and foster some international standard Vocational Schools.Expansion and equity of access while still paying attention to the quality of education and improving Vocational Schools management by applying the principle of "Good Governance."Facilities and infrastructure are other factors that determine the quality of Vocational graduates.Facilities and infrastructure such as buildings and other facilities support learning and teaching.Such as teaching aids and practice, laboratories, and vocational training centers as places for work practice for vocational schools are needed by students because they can bring students into a situation like in the world of work.The real.For this reason, it is also necessary to apply industrial work practices included in the Dual System Education framework to familiarize and introduce students to the real world of work.During industrial work practices, students rely on mastery of knowledge and guidance from the business world/industry carried out by instructors to provideexplanations and guidance about the company and the tasks that must be carried out.Working in the real world is the application of skills acquired in school to new situations that require a lot of problem-solving abilities.
has the power to change the face of the world, and those who control information have the power to control everything: world opinion, politics, society, and economics.Knowing where and how to obtain information, selecting information based on its use for personal development, analyzing data obtained with computer technology, and synthesizing the results of the analysis so that they can formulate excellent and correct decision alternatives, make decisions, and develop the knowledge that has been obtained are all skills required to master technology [vehicles.It focuses on diagnosing car engine performance to detect flaws in car engine components [17][33][34].OBD-II was first introduced in the mid-90s, where in previous use, OBD served as a solution to the problem of vehicle exhaust emissions and fuel usage to make it more efficient.Then in 1996, OBD II first appeared, where the function was even more sophisticated, namely being able to read information from the car ECU and monitor several parameters.One of which was that the device on the car, body, chassis, and OBD-II now connect to the internet network using 4G or Wi-Fi.The way OBD-II works is that the sensor will read the ECU with different parameters, which include battery status, temperature, fuel level, RPM, time since the engine started, and total engine operation in hours.Several parameters will be read directly from the vehicle, and the incoming data will be processed for processing and will monitor sensors and other parameters; well after that, the incoming data will be stored in memory[35].

Figure 1 .
Figure 1.OBD-II technology ADDIE model.The ADDIE model is suitable for developing learning media which consists of the analysis, design, development, implementation, and evaluation stages.The ADDIE model diagram can be seen in the image below.

Figure 2 .
Figure 2. ADDIE design [37] research only reached the design stage.The analysis stage is to determine the needs in the development process.The design phase is carried out based on the study's results in the previous step.Next, arrange an implementation schedule and material plans to be included in the learning media.The research begins with an analysis phase in the learning process.Prospective vocational education teachers do practical work to gain skills that will be taught in vocational schools later.Vehicle diagnostic material is one of the essential lessons to determine the damage to the vehicle's Fuel Injection system.A complex system makes the material require practical media that can help students learn.Needs analysis is carried out in observation to find gaps in learning vehicle diagnosis.A competency gap was found for prospective vocational teacher students who showed results below those expected in online learning in the vehicle diagnostic practice course.This gap indicates that during learning during the Covid-19 period, students only discussed the diagnosis of fuel injection-based vehicles, which differed from actual practical activities.In contrast, the front-end analysis involves analyzing the technology used in the vehicle diagnosis process.The vehicle diagnostic equipment owned by the laboratory is limited in number and expensive.This means that a vehicle diagnostic tool can be developed to support the practical learning process.Student analysis includes learning characteristics and student conditions.This situation analysis shows that during the Covid-19 pandemic learning to diagnose vehicles was carried out online, which resulted in a lack of practical experience in diagnosing fuel injection-based vehicles.The limitations of a fuel injectionbased vehicle diagnostic device owned by the lab require using vehicle diagnostic tools interchangeably.This causes the learning process to run less effectively.Analysis of current issues after the Covid-19 pandemic requires educators to be more creative in making learning media according to their needs [12][38][39][40].Innovations were made in developing this media by utilizing the Raspberry Pi as a processing medium and presenting data for diagnosing fuel injection-based vehicles.The analysis aims to identify the targets to be achieved in learning vehicle diagnosis, where students Volume 8, Number 1, May 2023 ISSN 2528-2611, e-ISSN 2528-2700 DTC status contains MIL, Voltage, and error codes on the system.
figure.The design of wireless engine diagnostic learning media is used to scan vehicle devices to determine engine conditions.The engine uses a fuel injection system that has access to ECU (Electronic Control Unit) data.This learning media helps students to diagnose damage symptoms more quickly.This learning media was designed based on the needs and devices available in the automotive workshop.

Table 1 .
Learning media eligibility criteria

Table 3 .
The expertise score