Alat Ukur Kelembaban Tanah Menggunakan Sensor YL-69 Berbasis Android Phone

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Daftar pustaka

http://eprints.ung.ac.id/3180/3/2012-1-1002-612309025bab210082012043452.pdf

http://repository.unhas.ac.id/bitstream/handle/123456789/3662/SKRIPSI%20RES
KI.pdf?sequence=2

https://core.ac.uk/download/pdf/12346078.pdf

https://www.google.co.id/search?q=SENSOR+YL+69&biw=1366&bih=667&noj
=1&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjs0cfQ55DLAhULkpQKHR
cUB50Q_AUIBygB#imgrc=K9fMXBrhkY5t5M%3A

https://id.wikipedia.org/wiki/Android_(sistem_operasi)

Universitas Sumatera Utara