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  • Author Author: shanesissons
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Project: ferris farm post 13

shanesissons

Hand written code

 

here is my basic idea for the code

 

 

 

to be run every 5 minutes or so

 

If temp is above x

  activate fan 1 (relay)

if temp is below x

  deactivate fan 1

 

if humidity is above x

  activate fan 2

if humidity is below x

  deactivate fan 2

 

 

to be run in conjunction with the motor

 

when motor is in one of 4 positions (controlled by a switch being in the off position)

test soil moisture

  if moisture is below x

  activate water for 2 seconds

  deactivate water

  wait 5 minutes

repeat last 5 lines until moisture is above x

 

after 6 hours rotate planters 90 degrees to next planter controlled by switch

 

repeat steps again

 

x refers to variables not yet known for the plants optimal range will be a range of numbers not a single digit

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  • Ok, let's see what we can figure out here...

     

    First I think the simplest thing to do here is to just put everything in the "big loop" inside your main() function.

    You can look at breaking things out into separate functions later if you want to clean the code up.

     

    You will need, at very least, a system tick timer. You can fins an example of this in the stk3200_blink example code. It would be great to use separate timers and interrupts if you can figure them out. But you can get what you want done with the system tick timer. It's just not as pretty.

     

    Here's how this can work...

     

    In the example code you will see this line:

    /* Setup SysTick Timer for 1 msec interrupts  */

      if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) while (1) ;

    This sets up the system tick timer based on based on the core clock divided by 1000. This will create a millisecond timer.

     

    This code is the interrupt handler for the tick timer. it will fire every 1ms and increment the global variable msTicks. Now if you capture that var at any given time and then continually compare it to a set value as you cycle through the big loop you can use it as a timer for your motor control, ensor reading, etc...

    I have put an exmple of this below the interrupt handler code.

     

    static volatile uint32_t msTicks; /* counts 1ms timeTicks */ This is just here so you can see how it's declared. Look at the blink example to                                                                                                                understand where it has to be declared.

    /**************************************************************************//**

    * @brief SysTick_Handler

    * Interrupt Service Routine for system tick counter

    *****************************************************************************/

    void SysTick_Handler(void)

    {

      msTicks++;      /* increment counter necessary in Delay()*/

    }

     

    /* My example

    main()

    {

        uint32_t motor_timer = 0; // The motor timer variable. You will need one of these for each timer function you want.

        uint32_t motor_timeout = 2160000; // This is 6 hours in ms

     

        motor_timer = msTicks; //Set the motor timer to the current system ticks count

        while(1)

        {

              if(msTicks - motor_timer >= motor_timeout) // When the system tick counter. msTick, has counted far enough past the captured value the                                                                                      // run_motor() function will be executed.

              {

                  run_motor();

              }

        }

    }


    OK, because I'm not sure exactly where you are as far as the C language and programming methods are concerned, take a look at this and let me know what you think. It's not the best or prettiest way to do it but until I understand your skill level with C I don't want to get too deep. So we'll do this one step at a time.


    Also, what sensors do you plan to use and how do you plan to interface all the peripherals? I know that's a big question but it will obviously determine what you need as far as software. What pins to use. What alternate functions to use, etc... You should be able to do everything from the expansion header on the EZR32WG. They have a nice set of GPIO and alternate function pins broke ou there.


    Cheers,

    Rick

  • in reply to RWReynolds

    Hi rick

    Thank you for the helop I will look into this deeply tomorrow its currently 3am here but it took a few minutes but I understand the code I think what I'm getting stuck with is how to write the code  and what pins to use

     

    As for what I am using

    I have a 8 channel relay for 2 fans and 1 water pump I believe I will only need to use 5 pins for this

    Andoer 5V Active Low 8 Channel Road Relay Module Control Board for Arduino PIC AVR MCU DSP ARM: Amazon.co.uk: DIY & Tool…

     

    The moisture sensor I will be using one of the boards and 4 sensors as the unit rotates it will connect to each on periodically when it is in the correct position I would also like to use this as the sensor to know when to start watering 

    SODIAL(R) Soil Hygrometer Humidity Detection Module Moisture Testing Sensor for Arduino PI: Amazon.co.uk: Garden & Outdo… 

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