SmartFarm Project

Overiew

RFID-Part

• send RFID of Tag
• send status of checksum

Voltage-Control

• send if fence is broken or if sth. lies on it
• send if animal-gate is open or closed

LoRA

• send and receive data

IEEE 802.15.4

• send upd pakages between client and server

Server

• receive data from LoRa-Module via UART
• send data to CoAP-Server

To flash tap

$ BOARD=nucleo-f411 make all flash term

Used Boards

• Selfmade RFID-Board
• Nucleo-F441
• mbed SX1276MB1xAS LoRa Shield

Send packages via LoRa

Necessary lib:

#include "lora.h"

The nodeID and the frameID enums are filled with

typedef enum lora_nodeID
{
    NODEID_NODEone 				= 0x01,
	NODEID_NODEtwo				= 0x02
} lora_nodeID;

typedef enum lora_frameID
{
    FRAMEID_HEARTBEAT 			= 0x01,
	FRAMEID_RFID_TAGID			= 0x02,
	FRAMEID_FENCE				= 0x10
	
} lora_frameID;

feel free to extend them

Make a Frame

lora_frame frame;

The Frame has the form

typedef struct lora_frame {
    uint8_t	nodeID;
	uint8_t frameID;
    char data[6];
} lora_frame ;

So let's fill the struct with a NodeID

frame.nodeID = 0x03;

and with a FrameID

frame.frameID = FRAMEID_RFID_TAGID;

Fill the struct with some payload:

char payload[6] = {0}; 
            .
            .
            .
frame.data[0] = payload[0];
frame.data[1] = payload[1];
frame.data[2] = payload[2];
frame.data[3] = payload[3];
frame.data[4] = payload[4]; 
frame.data[5] = payload[5]; 

Now we send our frame via LoRa:

lora_send_frame(frame);

RFID

To begin convince that u include the librarys for the mlx90109

#include "mlx90109.h"
#include "mlx90109_params.h"
#include "checksum/ucrc16.h"

Define Clock and Data Pin fit to the used hardware

#define MLX90109_PARAM_CLOCK
#define MLX90109_PARAM_DATA  

Create device descriptor

mlx90109_t mlx90109_dev;

The device descripter has the form

typedef struct {
    mlx90109_params_t p; 		/**< device configuation parameter */
	uint8_t counter;	  		/**< counter for data bits*/
	uint8_t counter_header;		/**< counter for Header bits "10000000000"*/
	uint8_t data[128];			/**< raw data*/
} mlx90109_t;

Then we create a Tag Object

tagdata newTag;  

Then make an interrupt for detecting new tags in the near field

void interrupt_hand(void *args)
{
    if (args){}
    int16_t temp = mlx90109_read(&mlx90109_dev);
    if (temp == MLX90109_DATA_OK)
    {
        printf("data ok\n");
    }
return;
}

Use the format-function to make raw-data(just a bitstring) to tagData (formated in TagID and countrycode). In this function also a checksum test is running in the background.

mlx90109_format(&mlx90109_dev, &neuerTag);

Fence

Necessary lib:

#include "fence.h"

Measure the voltage at fence

double measure (int numberOfMeasurement, double calculateParameter)

detecting the Gate state:

recognise_gate_funk (int port, int pin);

Value	Fence
0	open
1	closed
2	error at initialisation of the port

calculate transfer value

calculate_transfer_value(double voltageFence, int recogniseGate)

Value	Fence	Gate
1	broke	closed
2	broke	open
3	intact	closed
4	intact	open

To-Do:

- bidirectorial communication (LoRa)  
  - Testing under real conditions
- Error-handling