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| − | This is a year delayed because the light sensor misbehaves in outdoor light and only works reliably indoors.
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| − | I thought of a solution using two sensors to compare a target to a sample weed
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| − | instead of the trouble I am having with mathematically determining colours of weeds
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| − | (which frustratingly vary depending on brightness and quality of lighting).
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| − | Dual sensors would work because an indoor lit and outdoor lit target are compared to
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| − | a real sample indoor lit or outdoor lit sample rather than compared to a mathematical model of what is that weed colour.
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| − | Is it yellow? is no longer relevant. All that matters is: Is it the same relative to the sample weed under the same light condition as the target weed.
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| − | This circuit works, but the sensor is not distinguishing weeds from grass in outdoor light.
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| − | So I have not included the computer program to flash the Arduino, yet:
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| − | [[File:WeedWandSchematic1.png]]
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| − | This is the circuit only showing the alternate solenoid driver, which is a power supply plus P-channel mosfet instead of N-channel, above. Add the sensor from the previous schematic.
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| − | [[File:WeedWandSchematic2_alternateSolenoidDriverCircuit.png]]
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