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to turn on an irrigation motor for a very short time every several hours.
 
to turn on an irrigation motor for a very short time every several hours.
  
=== [[Wireless remote switch, button press: 1 second=ON, 3 seconds=OFF]] ===
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=== [[Wireless remote switch, button press: 1 second=ON, 6 seconds=OFF]] ===
 
My solar power has to be manually switched to city power at sunset in my
 
My solar power has to be manually switched to city power at sunset in my
 
basement. I made this wireless upstairs button, instead of running a long 120vac wire to an upstairs switch.
 
basement. I made this wireless upstairs button, instead of running a long 120vac wire to an upstairs switch.
  
 
=== [[Fridge Defrost Timer with Solar Trigger Option]] ===
 
=== [[Fridge Defrost Timer with Solar Trigger Option]] ===
The [https://vimeo.com/spinningwindmillfredhi project video] shows a fridge timer which can be set to trigger during high battery voltage sunny days so the defrost cycle never uses valuable battery power. It is switchable to act like a regular defrost timer for long cloudy stretches of time, like winter.
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The [https://vimeo.com/177809415 project video] shows a fridge timer which can be set to trigger during high battery voltage sunny days so the defrost cycle never uses valuable battery power. It is switchable to act like a regular defrost timer for long cloudy stretches of time, like winter.
  
 
=== [[Solar panel rotator motor power with auto-shut-off]] ===
 
=== [[Solar panel rotator motor power with auto-shut-off]] ===
The [https://vimeo.com/spinningwindmillfredhi project video] shows a way to power solar panel rotator motors from a solar panel, supplemented by a walladapter.
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The [https://vimeo.com/48903056 project video] shows a way to power solar panel rotator motors from a solar panel, supplemented by a walladapter.
 
 
=== [[Odroid XU4 Weeding Spraying Robot]] ===
 
The [https://vimeo.com/spinningwindmillfredhi project video] shows the completed robot spraying weeds. I proved the prototype works, although it is impracticably slow.
 
 
 
=== [[Dandelion Flower Weed Wand]] ===
 
The [vvv.com/239274466 xxx (no project video yet)] shows the Weed Wand detecting and targeting weeds. Weed Wand is ten times faster and more accurate than manually aiming and pulling a trigger on a pressurized pump sprayer.
 
 
 
=== [[Li-ion battery discharge limiter]] ===
 
I used a car booster battery to pump my car tires and it had no lower limit turn-off and it destroyed the Li-ion battery. I heard the air pump slow and I turned it off too late. This little device will do automatic flow-through and cut-off to protect the battery next time.
 
 
 
=== [[Temperature Difference Sensor and Switch for Solar Water Circulation Pump]] ===
 
This circuit uses two diodes as heat sensors to switch a circulation pump ON when the water on the roof solar water collector is hotter than the hot water storage tank in the house.
 

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