How to get soil sensor address

mlnz · June 24, 2019, 8:17am

Hello,
I am trying to understand how to get soil moisture from sensor, but I am not sure where to get soil sensor address. After SDK update there were some changes, and 64b device_address is now required. I tried to understand this example:

github.com

bigclownlabs/bcf-radio-soil-sensor/blob/master/app/application.c#L249


bc_button_init(&button, BC_GPIO_BUTTON, BC_GPIO_PULL_DOWN, false);
bc_button_set_event_handler(&button, button_event_handler, NULL);


// Initialize thermometer sensor on core module
bc_tmp112_init(&tmp112, BC_I2C_I2C0, 0x49);
bc_tmp112_set_event_handler(&tmp112, tmp112_event_handler, NULL);
bc_tmp112_set_update_interval(&tmp112, TEMPERATURE_UPDATE_SERVICE_INTERVAL);


// Initialize soil sensor
bc_soil_sensor_init_multiple(&soil_sensor, sensors, 5);
bc_soil_sensor_set_event_handler(&soil_sensor, soil_sensor_event_handler, NULL);
bc_soil_sensor_set_update_interval(&soil_sensor, SENSOR_UPDATE_SERVICE_INTERVAL);


// Initialize battery
bc_module_battery_init();
bc_module_battery_set_event_handler(battery_event_handler, NULL);
bc_module_battery_set_update_interval(BATTERY_UPDATE_INTERVAL);


// Initialize radio
bc_radio_init(BC_RADIO_MODE_NODE_SLEEPING);
bc_radio_pairing_request("soil-sensor", VERSION);

and I am confused where is device_address set. When you are calling the “soil_sensor_event_handler” there is no address in parameter…

I would like to use “bc_soil_sensor_get_moisture(self, device_address, &moisture)” function separately, but I don’t know where to get parameter “device_address”.

Thanks a lot for any help

Karel · June 24, 2019, 8:48am

In event handler as second parametr

github.com

bigclownlabs/bcf-radio-soil-sensor/blob/master/app/application.c#L132


                tick_report = bc_tick_get() + TEMPERATURE_PUB_INTERVAL;


                // Remember last published value
                last_published_temperature = temperature;
            }
        }
    }
}




void soil_sensor_event_handler(bc_soil_sensor_t *self, uint64_t device_address, bc_soil_sensor_event_t event, void *event_param)
{
    static char topic[64];


    if (event == BC_SOIL_SENSOR_EVENT_UPDATE)
    {
        int index = bc_soil_sensor_get_index_by_device_address(self, device_address);


        if (index < 0)
        {
            return;

mlnz · June 24, 2019, 10:01am

Thank you, I saw it before, but I thought that it is empty. In the event handler it is just initiated. When the function is called, there is not set this parameter (“bc_soil_sensor_set_event_handler(&soil_sensor, soil_sensor_event_handler, NULL);”). Or is it set by “something”? (where?)

When I would like to use the “bc_soil_sensor_get_moisture(self, device_address, &moisture)” function outside of event handler. Where I obtain the “device_address”, please?

I am sure that this is caused because my knowledge of C language is very poor, I am sorry… Lot of things I deducted from the code, but this is still confused for me…

hub.martin · June 24, 2019, 12:13pm

Hi, by using “multiple” init API you supply your own sensor(s) structure to the SDK. This way you could then read out the address in your application.c

Just set 1 as a number of sensors.
https://developers.bigclown.com/firmware/how-to-soil-moisture-sensor#multiple-connected-sensors

Then

sensors[0]._ds28e17._device_number

should hold the ID

mlnz · June 28, 2019, 5:30am

Thank you very much! I used your exaple with multiple sensors (but I have array with only one sensor). Then it is possible to use function “bc_soil_sensor_get_device_address_by_index” and it works!!! Very interesting is, that value of device_address (in event handler function) is not same as result of bc_soil_sensor_get_device_address_by_index(self,0) but it also works. I don’t know why, but it works… device_address in event_handler function is changing sometimes. I thought that address is adress and it is still same for every device. Probably not, but when it is possible to use function which returns address by index, it is not problem.

hub.martin · June 30, 2019, 7:11pm

Perfect you got it working.

Are you sure you are printing the addres correctly, because it is 64 bit number and printf needs something like %ll (longlong).