Various electronic travel aids for people having visual impairment have been developed based on ultrasonic object detection employing the HC-SR04 ultrasonic proximity sensor. However, most of them do not consider blind spots where harmful objects cannot be detected. This study discusses the development of a vest that can detect objects in front of the blinds more widely and provide sound alert if an object in front is detected. This detector was developed based on an Arduino Uno equipped with five HC-SR04 ultrasonic sensors, and a mini DFPlayer module. In addition, blind area analysis of sensor detection is carried out to overcome objects that are not detected by similar studies. Horizontally, this travel vest sweeps objects up to 150 cm in distance with a 25o right or left angle deviation from forward direction. Vertically, object detection reaches up to 150 cm in distance with both upward and downward deviation of 30o from the vest.
Latar Belakang : Kadar kolesterol LDL yang tinggi dan HDL yang rendah berkaitan dengan penyebab utama terjadinya penyakit jantung dan pembuluh darah. Serat diketahui dapat menurunkan kadar kolesterol LDL serta meningkatkan kolesterol HDL. Nata de coco mengandung selulosa, hemiselulosa dan lignin yang memiliki efek hipokolesterolemia dalam darah.Metode : Jenis penelitian adalah true experimental dengan rancangan control group pre-test-post-test. Sebanyak 52 wanita dengan kadar kolesterol LDL ≥100 mg/dl dan HDL ≤50 mg/dl menjadi subyek dalam penelitian ini. Subyek dibagi menjadi 3 kelompok, yaitu kelompok kontrol, perlakuan 1 mendapat 160 g nata de coco/hari (serat 4.8 g) dan perlakuan 2 mendapat 320 g nata de coco/hari (serat 9.6 g). Intervensi dilakukan selama 14 hari. Metode phosphotungstic precipilation digunakan untuk menganalisis kadar HDL sementara kadar LDL dianalisis mengunakan rumus Friedewald. Darah diambil setelah subyek berpuasa selama 10 jam. Analisis statistik yang digunakan antara lain paired-samples t test, ANOVA dan Kruskal-Wallis. Hasil : Konsumsi nata de coco sebanyak 160 g/hari dan 320 g/hari berturut-turut menurunkan kadar kolesterol LDL sebanyak 4.47% (p=0.091) dan 6.25% (p=0.044) serta meningkatkan kadar kolesterol HDL sebanyak 12.1% (p=0.001) dan 3.6% (p=0.361). Tidak terdapat perbedaan pengaruh pemberian nata de coco terhadap perubahan kadar kolesterol LDL antar kedua kelompok (p=0.863), namun terdapat pengaruh yang bermakna terhadap kolesterol HDL antar kedua kelompok (p=0.043). Sedangkan pada kelompok kontrol terjadi peningkatan kadar kolesterol LDL sebebesar 2.54% (p=0.005) dan penurunan kadar kolesterol HDL sebesar 0,56% (p=0.570).Kesimpulan : Konsumsi nata de coco sebanyak 320 g/hari berpengaruh terhadap penurunan kadar kolesterol LDL secara bermakna sedangkan pemberian nata de coco sebanyak 160 g/hari berpengaruh terhadap peningkatan kolesterol HDL secara bermakna.Kata kunci : nata de coco; kolesterol LDL; kolesterol HDL; wanita; dislipidemia.
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