Plant watering need monitor
First Claim
1. An electrical device operating at low currents for signaling the watering needs of a plant by monitoring the moisture level of the soil around said plant comprising:
- means for sensing said moisture level by generating an electrical signal generally proportional to said moisture level;
means for supporting said sensing means, shaped and dimensioned to be planted in said soil;
means for calibrating said device in accordance with the amount of water ordinarily needed by said plant;
a first semi-conductor switch having a drain terminal, a gate terminal and a source terminal, said drain terminal being connected to a voltage source through a load resistor, said gate terminal being connected to a signal reference ground, and said source terminal being connected to said electrical signal through a high value series resistor;
oscillating means for sending electrical pulses at a first frequency, said oscillating means being connected to said drain terminal and being triggered when the voltage differential between said signal and said voltage source causes a certain current flow across said first semi-conductor switch and said load resistor; and
audio-means responsive to said oscillating means for generating an audio-signal.
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Accused Products
Abstract
An alarm device for monitoring the watering needs of a plant which comprises a stick surmounted by a cylindrical box containing the electrical elements. The stick is buried in the soil of a pot holding a plant. The alarm device is powered by a battery easily installable and consists of a conductive probe detector located at the buried end of the stick. It also comprises a first integrated circuit which is switched by a backwards connected amplifier acting as a very high impedance switch which minimizes power consumption. The circuit emits a series of pulses when a threshold resistance level is reached. These pulses trigger a melody integrated circuit which produces a pleasant singing melody destined to draw the attention of the plant grower to the watering needs of a plant. The tune is repeatedly reproduced until the soil resistance detected by the probe detector has exceeded a threshold resistance level.
37 Citations
14 Claims
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1. An electrical device operating at low currents for signaling the watering needs of a plant by monitoring the moisture level of the soil around said plant comprising:
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means for sensing said moisture level by generating an electrical signal generally proportional to said moisture level; means for supporting said sensing means, shaped and dimensioned to be planted in said soil; means for calibrating said device in accordance with the amount of water ordinarily needed by said plant; a first semi-conductor switch having a drain terminal, a gate terminal and a source terminal, said drain terminal being connected to a voltage source through a load resistor, said gate terminal being connected to a signal reference ground, and said source terminal being connected to said electrical signal through a high value series resistor; oscillating means for sending electrical pulses at a first frequency, said oscillating means being connected to said drain terminal and being triggered when the voltage differential between said signal and said voltage source causes a certain current flow across said first semi-conductor switch and said load resistor; and audio-means responsive to said oscillating means for generating an audio-signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification