In mid-March 2020, WHO declared Covid-19 a global pandemic that all countries must pay attention to prevent wider transmission. Therefore, the Indonesian government appealed to the public to exercise physical distance and appeal to work from home to prevent the spread of the virus. Google provides facilities that can be used as online learning with a virtual classroom concept that can be used for distance learning between lecturers and students. In this research, we will discuss the level of effectiveness and efficiency of an online learning application called Google Classroom. The data used to analyze the effectiveness and efficiency of online learning with Google Classroom came from a student perspective questionnaire using the Likert scale method for positive questions and specific questions for theoretical subjects with 120 respondents from the UNESA electrical engineering department. We also propose blended learning signs when this pandemic has ended. The results obtained are according to the cumulative calculations that have been described in the graphical modeling, namely the highest percentage of 88% of students stated their agreement with the efficiency of online learning on time availability. Meanwhile, the level of effectiveness of online learning on the ease of the GC user interface with a majority percentage of 85% agreed. But if online learning refers to learning targets, the percentage obtained from a student's perspective is 37%, which is still low. If the pandemic has ended, we also get data results on blended learning planning on the use of GC, the majority of 60% of students agree.

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Formalin dan rhodamin b merupakan bahan kimia berbahaya yang paling sering disalah gunakan sebagai bahan tambahan pangan sesuai dengan laporan BPOM 2017 yang menunjukkan penyalahgunaan rhodamin mencapai 36% sedangkan formalin mencapai 32% padahal hal ini sudah dilarang oleh pemerintah yang telah tertuang dalam SK maupun peraturan kemenkes. Alat ini bermanfaat untuk membantu masyarakat dalam mendeteksi formalin dan rhodamin b, dengan desain yang kecil dan memiliki sumber daya internal alat ini bisa dibawa ke berbagai tempat dengan mudah dan dioperasikan secara langsung tanpa mencari sumber daya PLN. Alat ini memanfaatkan sensor MQ-138 yang berupa sensor gas untuk mendeteksi formalin dan photodiode untuk mendeteksi rhodamin b dengan arduino nano sebagai pusat pengendali dan hasilnya ditampilkan melalui OLED( Organic Light-Emitting Diod). Pada pengujian formalin memiliki nilai error 7% - 17% pada bahan tahu, ikan, dan mie basah dengan konsentrasi formalin yang berbeda – beda pada tiap bahan dimana pada bahan tahu memiliki akurasi 86%-   92% sementara pada bahan ikan memilki nilai akurasi antara 88% - 93% dan pada bahan mie basah memiliki akurasi antara 83% - 90%. Pengujian rhodamin b menggunakan 3 larutan dengan konsentrasi yang berbeda – beda dengan hasil pengujian menunjukkan error antara 24% - 27% dari ketiga bahan tersebut. Pada alat ini menggunakan 1 buah rechargeable battery dengan kapasitas 3000mAh yang mampu bertahan selama 8 jam

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Most function generators are composed of analog components, which make the function generator have relatively large dimensions. With relatively large dimensions of the tool, making the tool is not easy to carry everywhere. To make the dimensions of the tool become easier to bring everywhere, the waves generated by the function generator are not made from analog circuits, but are made from digital data stored on the microcontroller and then converted to analog with DAC pins. The method of this research is experimental method. The first thing began with a literature study of the components needed and then continues with the making of system design to generate smaller function generator which can display 4 waves, waves that can be displayed are sine waves, squares, triangles, and sawtooths. The results of the study showed that the function generator was successfully made with smaller dimensions with 10 x 15 cm so that it was easier to carry everywhere and was able to produce sine, square, triangle and sawtooth waves with Vpp of 2.24 volts, Vmax of 2.72 volts, and frequency of 1 KHz.

<p class="Abstrak"><strong>Abstract:</strong> Innovation of Project-based learning (PjBL) in the 21st century continues to be developed to improve learning outcomes. The use of Trainer kits presents several challenges in achieving learning objectives, both in terms of design, planning, and implementation. The purpose of this study is to implement the Automation of Electrical Installation trainer kit in project-based learning to increase student motivation, critical thinking, and competence. The research method uses research and development (R and D) with 4 models (Define, Design, Develop, Disseminate). Data collection techniques used theory tests and performance tests (measure of maximum performance type, MMP) and questionnaires (measure of typical performance type, MTP). The research trial used 120 respondents of final-level electrical engineering students from 3 universities in Surabaya, Indonesia. The resulting test of statistical analysis Wilcoxon using SPSS-23 obtained Asymp. Sig. (2-tailed) is valuable 0.000, meaning that there is an increase in the quality of learning on critical thinking skills, motivation, and competence of Electrical Engineering students by implementing a trainer kit in project-based learning.</p><strong>Abstrak:</strong> Inovasi Pembelajaran Berbasis Proyek di abad 21 terus dikembangkan untuk meningkatkan hasil belajar. Penggunaan Trainer kit menghadirkan beberapa tantangan dalam mencapai tujuan pembelajaran, baik dari segi desain, perencanaan, maupun implementasi. Tujuan dari penelitian ini adalah untuk mengimplementasikan trainer kit Otomasi Instalasi Listrik dalam pembelajaran berbasis proyek untuk meningkatkan motivasi, berpikir kritis, dan kompetensi siswa. Metode penelitian menggunakan research and development (R and D) dengan 4 model (<em>Define, Design, Develop, Disseminate</em>). Teknik pengumpulan data menggunakan tes teori dan tes kinerja (ukuran tipe kinerja maksimum, MMP) dan kuesioner (ukuran tipe kinerja tipikal, MTP). Uji coba penelitian ini menggunakan 120 responden mahasiswa teknik elektro tingkat akhir dari tiga universitas di Surabaya, Indonesia. Hasil uji analisis statistik Wilcoxon menggunakan SPSS-23 diperoleh Asymp. Tanda tangan (2-tailed) bernilai 0,000, artinya terdapat peningkatan kualitas pembelajaran keterampilan berpikir kritis, motivasi, dan kompetensi mahasiswa Teknik Elektro dengan menerapkan trainer kit dalam pembelajaran berbasis proyek.

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