ESP32 Project

Order a boat equipped with ESP32 by Wifi

09-01-22 287

Objective of this project:

In this project, we will order a small boat equipped with the ESP32 card via the Wifi network.

This is why we are going to create two micropython programs for the ESP32 board.

Components required

ESP32
relay
supply power module
pump of water of 5V
little boat
battery of 9V

Mounting:

For the servomotor:

we connect the yellow wire to pin 2 of the ESP32 board
connect the red wire to the 5V pin of the power supply module
connect the black wire to the GND pin of the ESP32 board.

For relay:

we connect pin (S) to pin 23 of the ESP32 board
we connect pin (+) to the 3.3V pin of the ESP32 board
we connect the pin (-) to the GND pin of the ESP32 board
Connect the COM pin to the (+) terminal of the water pump
Connect the NO pin to the 5V terminal of the power supply module

For the water pump: Connect the (-) terminal to the GND pin of the ESP32 board.

Micropython programs

Here are 3 micropython programs that allow you to connect the ESP32 card to the smartphone via the wifi network and to receive a message containing the command order of the boat.

boot.py:

# Complete project details at https://RandomNerdTutorials.com
import machine

try:
  import usocket as socket
except:
  import socket

from machine import Pin
import network
from servo import Servo
import esp
esp.osdebug(None)

import gc
gc.collect()

ssid = '*************' # pour la connexion de la carte ESP32 au réseau wifi
password = '*************'

station = network.WLAN(network.STA_IF)

station.active(True)
station.connect(ssid, password)

while station.isconnected() == False:
  pass

print('Connection successful')
print(station.ifconfig())

pompe = Pin(2, Pin.OUT)
servo_pin = machine.Pin(23)
my_servo = Servo(servo_pin)

# Complete project details at https://RandomNerdTutorials.com

import machine

try:

import usocket as socket

except:

import socket

from machine import Pin

import network

from servo import Servo

import esp

esp.osdebug(None)

import gc

gc.collect()

ssid = '*************' # pour la connexion de la carte ESP32 au réseau wifi

password = '*************'

station = network.WLAN(network.STA_IF)

station.active(True)

station.connect(ssid, password)

while station.isconnected() == False:

pass

print('Connection successful')

print(station.ifconfig())

pompe = Pin(2, Pin.OUT)

servo_pin = machine.Pin(23)

my_servo = Servo(servo_pin)

main.py:

# Complete project details at https://RandomNerdTutorials.com

def web_page():
  if pompe.value() == 1:
    gpio_state="ON"
  else:
    gpio_state="OFF"

  html = """<html><head> <title>ESP Web Server</title> <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" href="data:,"> <style>html{font-family: Helvetica; display:inline-block; margin: 0px auto; text-align: center;}
  h1{color: #0F3376; padding: 2vh;}p{font-size: 1.5rem;}.button{display: inline-block; background-color: #e7bd3b; border: none; 
  border-radius: 4px; color: white; padding: 16px 30px; text-decoration: none; font-size: 20px; margin: 2px; cursor: pointer;}
  .button2{background-color: red;}</style></head><body> <h1>ESP Web Server</h1> 
  <p>GPIO state: <strong>""" + gpio_state + """</strong></p><p><a href="/?pompe=on"><button class="button">Avant</button></a></p>
  <table><tr><td><p><a href="/?pompe=gauche"><button class="button">Gauche</button></a></p></td><td><p><a href="/?pompe=off"><button class="button button2">Stop</button></a></p></td>
  <td><p><a href="/?pompe=droite"><button class="button">Droite</button></a></p></td>
  </tr></table></body></html>"""
  return html

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', 80))
s.listen(5)

while True:
  conn, addr = s.accept()
  print('Got a connection from %s' % str(addr))
  request = conn.recv(1024)
  request = str(request)
  print('Content = %s' % request)
  pompe_on = request.find('/?pompe=on')
  pompe_off = request.find('/?pompe=off')
  pompe_droite = request.find('/?pompe=droite')
  pompe_gauche = request.find('/?pompe=gauche')
  if pompe_on == 6:
    print('LED ON')
    pompe.value(1)
    my_servo.write_angle(90)
  if pompe_off == 6:
    print('LED OFF')
    pompe.value(0)
  if pompe_droite == 6:
    print('LED ON')
    pompe.value(1)
    my_servo.write_angle(45)
  if pompe_gauche == 6:
    print('LED ON')
    pompe.value(1)
    my_servo.write_angle(135)  
  response = web_page()
  conn.send('HTTP/1.1 200 OK\n')
  conn.send('Content-Type: text/html\n')
  conn.send('Connection: close\n\n')
  conn.sendall(response)
  conn.close()

# Complete project details at https://RandomNerdTutorials.com

def web_page():

if pompe.value() == 1:

gpio_state="ON"

else:

gpio_state="OFF"

html = """<html><head> <title>ESP Web Server</title> <meta name="viewport" content="width=device-width, initial-scale=1">

h1{color: #0F3376; padding: 2vh;}p{font-size: 1.5rem;}.button{display: inline-block; background-color: #e7bd3b; border: none;

border-radius: 4px; color: white; padding: 16px 30px; text-decoration: none; font-size: 20px; margin: 2px; cursor: pointer;}

.button2{background-color: red;}</style></head><body> <h1>ESP Web Server</h1>

<p>GPIO state: <strong>""" + gpio_state + """</strong></p><p><a href="/?pompe=on"><button class="button">Avant</button></a></p>

<table><tr><td><p><a href="/?pompe=gauche"><button class="button">Gauche</button></a></p></td><td><p><a href="/?pompe=off"><button class="button button2">Stop</button></a></p></td>

<td><p><a href="/?pompe=droite"><button class="button">Droite</button></a></p></td>

</tr></table></body></html>"""

return html

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.bind(('', 80))

s.listen(5)

while True:

conn, addr = s.accept()

print('Got a connection from %s' % str(addr))

request = conn.recv(1024)

request = str(request)

print('Content = %s' % request)

pompe_on = request.find('/?pompe=on')

pompe_off = request.find('/?pompe=off')

pompe_droite = request.find('/?pompe=droite')

pompe_gauche = request.find('/?pompe=gauche')

if pompe_on == 6:

print('LED ON')

pompe.value(1)

my_servo.write_angle(90)

if pompe_off == 6:

print('LED OFF')

pompe.value(0)

if pompe_droite == 6:

print('LED ON')

pompe.value(1)

my_servo.write_angle(45)

if pompe_gauche == 6:

print('LED ON')

pompe.value(1)

my_servo.write_angle(135)

response = web_page()

conn.send('HTTP/1.1 200 OK\n')

conn.send('Content-Type: text/html\n')

conn.send('Connection: close\n\n')

conn.sendall(response)

conn.close()

servo.py:

from machine import PWM
import math

# originally by Radomir Dopieralski http://sheep.art.pl
# from https://bitbucket.org/thesheep/micropython-servo

class Servo:
    """
    A simple class for controlling hobby servos.
    Args:
        pin (machine.Pin): The pin where servo is connected. Must support PWM.
        freq (int): The frequency of the signal, in hertz.
        min_us (int): The minimum signal length supported by the servo.
        max_us (int): The maximum signal length supported by the servo.
        angle (int): The angle between the minimum and maximum positions.
    """
    def __init__(self, pin, freq=50, min_us=600, max_us=2400, angle=180):
        self.min_us = min_us
        self.max_us = max_us
        self.us = 0
        self.freq = freq
        self.angle = angle
        self.pwm = PWM(pin, freq=freq, duty=0)

    def write_us(self, us):
        """Set the signal to be ``us`` microseconds long. Zero disables it."""
        if us == 0:
            self.pwm.duty(0)
            return
        us = min(self.max_us, max(self.min_us, us))
        duty = us * 1024 * self.freq // 1000000
        self.pwm.duty(duty)

    def write_angle(self, degrees=None, radians=None):
        """Move to the specified angle in ``degrees`` or ``radians``."""
        if degrees is None:
            degrees = math.degrees(radians)
        degrees = degrees % 360
        total_range = self.max_us - self.min_us
        us = self.min_us + total_range * degrees // self.angle
        self.write_us(us)

from machine import PWM

import math

# originally by Radomir Dopieralski http://sheep.art.pl

# from https://bitbucket.org/thesheep/micropython-servo

class Servo:

"""

A simple class for controlling hobby servos.

Args:

pin (machine.Pin): The pin where servo is connected. Must support PWM.

freq (int): The frequency of the signal, in hertz.

min_us (int): The minimum signal length supported by the servo.

max_us (int): The maximum signal length supported by the servo.

angle (int): The angle between the minimum and maximum positions.

"""

def __init__(self, pin, freq=50, min_us=600, max_us=2400, angle=180):

self.min_us = min_us

self.max_us = max_us

self.us = 0

self.freq = freq

self.angle = angle

self.pwm = PWM(pin, freq=freq, duty=0)

def write_us(self, us):

"""Set the signal to be ``us`` microseconds long. Zero disables it."""

if us == 0:

self.pwm.duty(0)

return

us = min(self.max_us, max(self.min_us, us))

duty = us * 1024 * self.freq // 1000000

self.pwm.duty(duty)

def write_angle(self, degrees=None, radians=None):

"""Move to the specified angle in ``degrees`` or ``radians``."""

if degrees is None:

degrees = math.degrees(radians)

degrees = degrees % 360

total_range = self.max_us - self.min_us

us = self.min_us + total_range * degrees // self.angle

self.write_us(us)

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23-05-22

Order a boat equipped with ESP32 by Wifi

Objective of this project:

Components required

Mounting:

Micropython programs

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