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=== [[Fridge Defrost Timer with Solar Trigger Option]] ===
 
=== [[Fridge Defrost Timer with Solar Trigger Option]] ===
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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]] ===
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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]] ===
 
=== [[Odroid XU4 Weeding Spraying Robot]] ===
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The [https://vimeo.com/spinningwindmillfredhi project video] shows the completed robot spraying weeds. I proved the prototype works, although it is impracticably slow.
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This is a minor note about how to access pin 5 of CONN11, which is a 12 pin connector which was inaccessible using wiringPi library.
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I figured out how to use that undocumented pin because I needed one more gpio wire!
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https://github.com/hardkernel/wiringPi
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https://ameridroid.com/products/odroid-xu4
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https://wiki.odroid.com/odroid-xu4/odroid-xu4
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https://wiki.odroid.com/odroid-xu4/software/gpio_register_map#gpio_port_register_map
  
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=== [[Dandelion Flower Weed Wand]] ===
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You can modify the C language file odroidxu3.c which has a placeholder filled with several -1 items as an error return code. The XU3 and XU4 both have 1 to 40 pins accessible from the Shifter Shield. I used all the GPIO (GPX) IN/OUT pins with success. That is the 40 pin connector. https://wiki.odroid.com/accessory/add-on_boards/xu4_shift_shield
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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.
 
  
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=== [[Li-ion battery discharge limiter]] ===
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Here is the library wiringPi which I started with: https://github.com/hardkernel/wiringPi and you will find a file odroidxu3.c in there.
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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.
 
  
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=== [[Temperature Difference Sensor and Switch for Solar Water Circulation Pump]] ===
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See the other 12 pin connector of the XU4. Pin 5 is a GPX3.2 IN/OUT pin. I will arbitrarily call it pin 45, as in 40 pins plus the 5th one on the other connector. The CPU register space sees it as mathematically adjacent to GPX3.1, which is pin 36, GPX3.1 and CONN11/pin 5 is GPX3.2. https://wiki.odroid.com/odroid-xu4/software/gpio_register_map#gpio_port_register_map
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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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You can simply change one number from -1 to 34 without understanding why:
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Change odroidxu3.c and recompile the library. Then you can simply do things like digitalWrite(45, 1); and pinMode (45, OUTPUT ) and instead of getting a return -1 error you will get proper success where previously the range of pins was 1 to 40.
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Here is the change to odroidxu3.c See the number 34 in there, just below "//Not Used"? That was a -1. Change the -1 to a 34 and recompile. That is all you have to do. That 34 is in the 45th position thus pin 45.
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static const int phyToGpio[64] = {
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      // physical header pin number to native gpio number
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      -1,            //  0
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      -1,  -1,        //  1 |  2 : 3.3V, 5.0V
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      209, -1,        //  3 |  4 : GPB3.2(I2C_1.SDA), 5.0V
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      210, -1,        //  5 |  6 : GPB3.3(I2C_1.SCL), GND
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      18, 172,        //  7 |  8 : GPX1.2, GPA0.1(UART_0.TXD)
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      -1, 171,        //  9 | 10 : GND, GPA0.0(UART_0.RXD)
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      174,173,        // 11 | 12 : GPA0.3(UART_0.CTSN), GPA0.2(UART_0.RTSN)
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      21,  -1,        // 13 | 14 : GPX1.5, GND
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      22,  19,        // 15 | 16 : GPX1.6, GPX1.3
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      -1,  23,        // 17 | 18 : 3.3V, GPX1.7
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      192, -1,        // 19 | 20 : GPA2.7(SPI_1.MOSI), GND
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      191, 24,        // 21 | 22 : GPA2.6(SPI_1.MISO), GPX2.0
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      189,190,        // 23 | 24 : GPA2.4(SPI_1.SCLK), GPA2.5(SPI_1.CSN)
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      -1,  25,        // 25 | 26 : GND, GPX2.1
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      187,188,        // 27 | 28 : GPA2.2(I2C_5.SDA), GPA2.4(I2C_5.SCL)
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      28,  -1,        // 29 | 30 : GPX2.4, GND
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      30,  29,        // 31 | 32 : GPX2.6, GPX2.5
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      31,  -1,        // 33 | 34 : GPX2.7, GND
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      -1,  33,        // 35 | 36 : PWR_ON(INPUT), GPX3.1
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      -1,  -1,        // 37 | 38 : ADC_0.AIN0, 1.8V REF OUT
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      -1,  -1,        // 39 | 40 : GND, AADC_0.AIN3
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      // Not used  (August 2, 2019, add pin 45 to be pin 5 of CON11 Odroid Shifter Shield XU4
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      -1, -1,
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      -1, -1,
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      34, -1, // pin 5 of CONN11 GPX3.2(#34) wiki.odroid.com/odroid-xu4/hardware/expansion_connectors#gpio_map_for_wiringpi_library_con10_2_x_15
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      -1, -1, // 41...48
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      -1, -1,
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      -1, -1,
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      -1, -1,
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      -1, -1, // 49...56
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      -1, -1,
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      -1, -1,
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      -1, -1,
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      -1      // 57...63
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};
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I am using Phys mode. I never tested other modes.

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