User:Definitionofis

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MPPT Solar and Wind Power Boost Charge Controller

This is an analogue computer with a digital option. It is an elegant, unique idea for MPPT. I have some documentation videos and circuit inside the link. The circuit works but I never used it much because my wind turbine project stalled. I am back: April 2016.

Sun Tracker or Irrigation Timer to drive motors

This is using two LEDs to sense the sun and send +- or -+ logic signals to a full bridge motor driver. You could also use this circuit 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

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.

Fridge Defrost Timer with Solar Trigger Option

The 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

The project video shows a way to power solar panel rotator motors from a solar panel, supplemented by a walladapter.

Odroid XU4 Weeding Spraying Robot

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. I figured out how to use that undocumented pin because I needed one more gpio wire! https://github.com/hardkernel/wiringPi https://ameridroid.com/products/odroid-xu4 https://wiki.odroid.com/odroid-xu4/odroid-xu4

https://wiki.odroid.com/odroid-xu4/software/gpio_register_map#gpio_port_register_map

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

Here is the library wiringPi which I started with: https://github.com/hardkernel/wiringPi and you will find a file odroidxu3.c in there.

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

You can simply change one number from -1 to 34 without understanding why:

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.

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.

static const int phyToGpio[64] = {

      // physical header pin number to native gpio number
      -1,             //  0
      -1,  -1,        //  1 |  2 : 3.3V, 5.0V
      209, -1,        //  3 |  4 : GPB3.2(I2C_1.SDA), 5.0V
      210, -1,        //  5 |  6 : GPB3.3(I2C_1.SCL), GND
      18, 172,        //  7 |  8 : GPX1.2, GPA0.1(UART_0.TXD)
      -1, 171,        //  9 | 10 : GND, GPA0.0(UART_0.RXD)
      174,173,        // 11 | 12 : GPA0.3(UART_0.CTSN), GPA0.2(UART_0.RTSN)
      21,  -1,        // 13 | 14 : GPX1.5, GND
      22,  19,        // 15 | 16 : GPX1.6, GPX1.3
      -1,  23,        // 17 | 18 : 3.3V, GPX1.7
      192, -1,        // 19 | 20 : GPA2.7(SPI_1.MOSI), GND
      191, 24,        // 21 | 22 : GPA2.6(SPI_1.MISO), GPX2.0
      189,190,        // 23 | 24 : GPA2.4(SPI_1.SCLK), GPA2.5(SPI_1.CSN)
      -1,  25,        // 25 | 26 : GND, GPX2.1
      187,188,        // 27 | 28 : GPA2.2(I2C_5.SDA), GPA2.4(I2C_5.SCL)
      28,  -1,        // 29 | 30 : GPX2.4, GND
      30,  29,        // 31 | 32 : GPX2.6, GPX2.5
      31,  -1,        // 33 | 34 : GPX2.7, GND
      -1,  33,        // 35 | 36 : PWR_ON(INPUT), GPX3.1
      -1,  -1,        // 37 | 38 : ADC_0.AIN0, 1.8V REF OUT
      -1,  -1,        // 39 | 40 : GND, AADC_0.AIN3
      // Not used  (August 2, 2019, add pin 45 to be pin 5 of CON11 Odroid Shifter Shield XU4
      -1, -1,
      -1, -1,
      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
      -1, -1, // 41...48
      -1, -1,
      -1, -1,
      -1, -1,
      -1, -1, // 49...56
      -1, -1,
      -1, -1,
      -1, -1,
      -1      // 57...63

};

I am using Phys mode. I never tested other modes.

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