ESP32 Internet of things Project

IoT applied in Agriculture with ESP32

11-05-21 1200

Connected objects have applications in many sectors, and agriculture is one of the most benefiting from the benefits of the Internet of Things.

Purpose of this project

This project describes the application of IoT (Internet of Things) in agriculture. In this environment we take measurements of the humidity of the soil of a plant.

Monitoring of the parameter around this process (information provided by the soil sensor) is done using open source tools and resources such as ESP32 and ThingSpeak. We read the sensor data in real time on the internet through a web page and also on the graphs in ThingSpeak.

This work is done using an ESP32 microcontroller which will send all information via WIFI concerning the environment of our plant, to ThingSpeak.

Necessary components

ESP32
Soil moisture sensor
Connecting wires
Test plate
Wifi network

Mounting

To perform the assembly, you can connect:

for the soil sensor:

pin S to pin D34 of the ESP32 board
pin (+) to pin 3.3V of the ESP32 board
pin (-) to the GND pin of the ESP32 board

The soil moisture values sent by the ESP32 card to the thinkspeak.com site

Program in micropython:

from simple import MQTTClient
import network
import time 
from time import sleep
from machine import Pin,ADC
import dht
WiFi_SSID = "username"
WiFi_PASS = "password"
SERVER = "mqtt.thingspeak.com"
client = MQTTClient("umqtt_client", SERVER)
CHANNEL_ID = "*************"
WRITE_API_KEY = "*************"
pin_sol = ADC(Pin(34))
pin_sol.atten(ADC.ATTN_11DB)

def do_connect():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    if not wlan.isconnected():
        print('connecting to network...')
        wlan.connect(WiFi_SSID, WiFi_PASS)
        while not wlan.isconnected():
            pass
    print('network config:', wlan.ifconfig())

do_connect()
time.sleep(3)
topic = "channels/" + CHANNEL_ID + "/publish/" + WRITE_API_KEY

while True:
  humidite_value = pin_sol.read()
  payload = "field1="+str(humidite_value)
  client.connect()
  client.publish(topic, payload) #send temperature and humidity values to thingspeak.com
  client.disconnect()
  time.sleep(60)

from simple import MQTTClient

import network

import time

from time import sleep

from machine import Pin,ADC

import dht

WiFi_SSID = "username"

WiFi_PASS = "password"

SERVER = "mqtt.thingspeak.com"

client = MQTTClient("umqtt_client", SERVER)

CHANNEL_ID = "*************"

WRITE_API_KEY = "*************"

pin_sol = ADC(Pin(34))

pin_sol.atten(ADC.ATTN_11DB)

def do_connect():

wlan = network.WLAN(network.STA_IF)

wlan.active(True)

if not wlan.isconnected():

print('connecting to network...')

wlan.connect(WiFi_SSID, WiFi_PASS)

while not wlan.isconnected():

pass

print('network config:', wlan.ifconfig())

do_connect()

time.sleep(3)

topic = "channels/" + CHANNEL_ID + "/publish/" + WRITE_API_KEY

while True:

humidite_value = pin_sol.read()

payload = "field1="+str(humidite_value)

client.connect()

client.publish(topic, payload) #send temperature and humidity values to thingspeak.com

client.disconnect()

time.sleep(60)

Remarque: il faut importer la bibliothèque suivante: simple.py

You can also see

Door security system controlled by ESP32

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IoT applied in Agriculture with ESP32

Purpose of this project

Necessary components

Mounting

The soil moisture values sent by the ESP32 card to the thinkspeak.com site

Program in micropython:

You can also see

Door security system controlled by ESP32

Water level measurement system based on ESP32 and Smartphone

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