/canne_avertisseuse

Primary LanguageC++

Canne-avertisseuse

"La canne_avertisseuse" is an alert system for gravity irrigation. They use LoRa to communicate and detect the presence of water

Hardware

Compenent

* Antenne for 868 MHZ - ~5€ https://bit.ly/2SDVVCL

* GPS Adafruit 745 - 41€ https://bit.ly/2LHuB5R

*accelerometer Adafruit MMA8451 - 9€ https://bit.ly/2Mcii0F

* Females connector 8 and 9 * 2× terminal block connector https://fr.rs-online.com/web/p/products/1814377/

* regulateur DC/DC 4,6-32V ->3,3V https://fr.rs-online.com/web/p/regulateurs-a-decoupage/7553429/

* potentiometer resistance

setting

to start compiling the program and uploading it. By reading the serial port you can get the DEV_ID to configure the device on The Things network.

Commissioning.h

you must enter the keys APP_EUI and APP_KEY to retrieve from the The Things Board application. to allow communication.

APB

#define APP_EUI "123456789ABCDEF"
#define APP_KEY "123456789ABCDEF"

The other parameters can be adjusted to adapt to the condition of use.
The ABP parameters will only be completed in the case of an ABP connection.

canne_avertisseuse.h

#define coef_pont 2

Use a multimeter to measure the voltage between pin A2 and GND and then between the 2 terminals of the battery. the coefficient will be VA2/VBAT.

#define tempo 60000 //en ms
#define nbr_monitoring 60
int compteur = nbr_monitoring;

tempo: time between 2 readings of the accelerometer and water sensors nbr_monitoring: number of monitoring to trigger a heartbeat tempo × nbr_monitoring = heartbeat tempo

Principle of operation

ALERT

  • water alert
  • motion/theft alert
  • battery alert In the case of one of these alerts, a message containing the alert type, battery value and GPS coordinates is sent otherwise only a heartbeat is sent regularly

Sensor

  • Water sensor: it is made up of 2 electrodes if the current manages to pass between the 2 electrodes, the input A6 goes from 0v to ~3.3V. The water is detected
  • Accelerometer: If one of the acceleration values changes sufficiently on one of the axes, it can be deduced that the rod is no longer in its initial position
  • GPS: The GPS gives us the geographical position of the device. A measurement is only taken at the start or when a sensor detects something
  • Voltmeter for the battery: the battery level is regularly monitored to prevent any system failure

APB