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digital soil moisture meter circuit pdf

The VG-METER-200 is a low cost hand held soil moisture meter with a professional digital display.

This a break through soil moisture meter is for professionals, but is in the price range that any home gardener afford it.

Not only does it provide accurate readings of soil moisture content it also displays the current ambient temperature, and has a light sensor which detects and displays the level of light.

This meter uses our break through VH400 soil moisture sensor, and presents soil moisture results as a simple percentage (VWC). Light is also returned as a simple to understand percentage, where 0% is dark, and 100% is full sunlight. The VH400 sensor is included and integrated into the meter.

The temperature displayed is the ambient temperature measured at the hand held unit. The meter can be figured to display either Celsius or Fahrenheit. The temperature sensor can be calibrated for even greater accuracy.

The meter displays the current time. All measurements including the time can be displayed on the data display screen, or they may be individually disabled.
Probes come standard with a 1.2 meter (4 ft) cable. The probe is waterproof, and about 5 inches long. Because it is slender it can be used to measure soil moisture in potted plants, as well as the ground. Because it uses a capacitive based VH400 probe, it never corrodes, is insensitive to soil salinity, and gives very precise readings.

The hand held enclosure is small enough to fit in a pocket, and has in-molded rubber side grips for a comfortable grip.

It runs on 2 AA batteries and because it is so low power, the batteries should last for years, with normal use.

The meter comes in two varieties, one with a USB interface and one without. The version with the USB interface, can stream data to a computer through most communication programs such as Windows Hyperterminal. The USB version comes with a mini-USB cable.