how to make digital soil moisture meter using LM3915

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=bFIcBDCv5_8

Subscribe here: https://goo.gl/Z1jtos • The tester measures the dryness or wetness through soil resistance readings (0 to about 5 kilo-ohms) and indicates in dot mode by sequential lighting of LED1 through LED9. The first LED (LED1) lights up when the conductance is high (resistance is almost nil). • Normally, the soil resistivity varies from 0 to about 5 kilo-ohms. So for calibration, connect a 5-kilo-ohm potmeter between the two probes. Using trimpot VR1, set resistance to zero (minimum). LED1 should glow. Similarly, set resistance to 5 kilo-ohms (maximum). Now, LED9 should glow. • Circuit: https://www.dropbox.com/s/xywh8t1dvdb... • Subscribe here: https://goo.gl/Z1jtos

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