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Channel encoder is a part of transmitter block in a digital communication system which is capable of protecting information data from errors by adding parity bits from bits of information. The channel encoder receives bits of information from the source encoder and produces a new code called the codeword. Hamming code is one of the coding mechanisms used to protect information data from errors, with the ability to correct an error. This study explains the design of (7.4) Hamming encoder code channel trainer by using Arduino Mega 2560. The purpose of this research is producing a product that synchronizes a theory with the realization of how the channel encoder blocks work. Important parameters in the encoder channel are information bits, matrix generator, and parity bits. The form of the matrix generator affects the parity bits and the generated codeword. Therefore, the trainer is made and designed that can be used in the form of different matrix generator and qualify of (7.4) Hamming code channel encoder. This trainer is made in two stages: the simulation stage using Proteus 8 Professional and the hardware manufacturing stage. The results showed that the trainers worked in accordance with the theory (7.4) Hamming code channel encoder.

The rapid advancement of technology demands the ability of students to apply knowledge in solving problems that occur in society. This paper proposes the development of student worksheets for Infrared Technology material using the PjBL-STEM learning model. This study aims to determine the feasibility level of the student worksheets and students' responses after using that. This study involved two teachers and 43 students from 2 Vocational High School who were taking Electronic Circuit Application subjects. The level of feasibility was seen from the teacher's assessment, while the students' responses were seen from the questionnaire. The feasibility assessment instrument and student response questionnaire were prepared based on the Teaching Material Assessment Standards by the National Education Standards Agency (BSNP). This research was conducted using the ADDIE approach. Based on the teacher assessment, the feasibility level of the PjBL-STEM-based worksheets was categorized as very good or very feasible (91%). Meanwhile, from the students' responses, the score was 87.61% in the very good or very satisfied category. The conclusion from this research is that the PjBL-STEM-based student worksheets are very suitable to be used as teaching materials for Infrared Technology material in the subject of Electronic Circuit Application.