[IoT] Setup RPi Pico W and ESP32 MicroControllers

#include <Arduino.h>

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(921600);
  Serial.println("Hello from the setup");
}

void loop() {
  delay(1000);
  digitalWrite(LED_BUILTIN, HIGH);
  Serial.println("Hello from the loop");
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);
}

#define WIFI_SSID "wifi_network_name"
#define WIFI_PASSWORD "wifi_password"

void setup() {
  Serial.begin(921600);
  pinMode(LED_BUILTIN, OUTPUT);

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  Serial.println("starting");
}

bool isConnected = false;

void loop() {
  if (WiFi.status() == WL_CONNECTED && !isConnected) {
    Serial.println("Connected");
    digitalWrite(LED_BUILTIN, HIGH);
    isConnected = true;
  }

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println(".");
    digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
    delay(1000);
    isConnected = false;
  }
}

from machine import Pin
from time import sleep

#led = Pin(25, Pin.OUT)
led = Pin("LED", Pin.OUT) #For Pico W: Thanks to Easy Learning Video https://www.youtube.com/watch?v=PvH_yKwtoEA

n=0

while True:
    led.toggle()
    print("13 times {} is {}".format(n,13))
    n = n+1
    sleep(0.5)

import machine
import utime
sensor_temp = machine.ADC(4)
conversion_factor = 3.3 / (65535) #pico's datasheet
while True:
    reading = sensor_temp.read_u16() * conversion_factor
    temperature = 27 - (reading - 0.706)/0.001721
    print(temperature)
    utime.sleep(2)

# A simple example that:
# - Connects to a WiFi Network defined by "ssid" and "password"
# - Performs a GET request (loads a webpage)
# - Queries the current time from a server

import network   # handles connecting to WiFi
import urequests # handles making and servicing network requests

# Connect to network
wlan = network.WLAN(network.STA_IF)
wlan.active(True)

# Fill in your network name (ssid) and password here:
ssid = 'HUAWEI P30'
password = 'mokradupa68' #Funny, isn't it?
wlan.connect(ssid, password)


# Example 1. Make a GET request for google.com and print HTML
# Print the html content from google.com
print("1. Querying the Web.com:")
r = urequests.get("https://fossengineer.com")
print(r.content)

r = urequests.get("http://date.jsontest.com/")
print(r.json())
print(r.json()['time'])

version: '3'
services:
  mosquitto:
    image: eclipse-mosquitto
    container_name: mosquitto
    ports:
      - "1883:1883"
      - "9001:9001"
    restart: always
    volumes:
      - /path/to/mosquitto/config:/mosquitto/config

  nodered:
    image: nodered/node-red
    container_name: nodered
    ports:
      - "1880:1880"
    restart: always
    volumes:
      - /path/to/nodered/data:/data
    environment:
      - TZ=your_time_zone

/*********
  Author: Jitesh Saini
  This code is built upon the example code in pubsubclient library 
  Complete project details at https://helloworld.co.in
*********/

#include <WiFi.h>
#include <PubSubClient.h>

// Replace the SSID/Password details as per your wifi router
const char* ssid = "yourSSID";
const char* password = "yourPassword";

// Replace your MQTT Broker IP address here:
const char* mqtt_server = "192.168.1.45";

WiFiClient espClient;
PubSubClient client(espClient);

long lastMsg = 0;

#define ledPin 2

void blink_led(unsigned int times, unsigned int duration){
  for (int i = 0; i < times; i++) {
    digitalWrite(ledPin, HIGH);
    delay(duration);
    digitalWrite(ledPin, LOW); 
    delay(200);
  }
}

void setup_wifi() {
  delay(50);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  int c=0;
  while (WiFi.status() != WL_CONNECTED) {
    blink_led(2,200); //blink LED twice (for 200ms ON time) to indicate that wifi not connected
    delay(1000); //
    Serial.print(".");
    c=c+1;
    if(c>10){
        ESP.restart(); //restart ESP after 10 seconds
    }
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
}

void connect_mqttServer() {
  // Loop until we're reconnected
  while (!client.connected()) {

        //first check if connected to wifi
        if(WiFi.status() != WL_CONNECTED){
          //if not connected, then first connect to wifi
          setup_wifi();
        }

        //now attemt to connect to MQTT server
        Serial.print("Attempting MQTT connection...");
        // Attempt to connect
        if (client.connect("ESP32_client1")) { // Change the name of client here if multiple ESP32 are connected
          //attempt successful
          Serial.println("connected");
          // Subscribe to topics here
          client.subscribe("rpi/broadcast");
          //client.subscribe("rpi/xyz"); //subscribe more topics here
          
        } 
        else {
          //attempt not successful
          Serial.print("failed, rc=");
          Serial.print(client.state());
          Serial.println(" trying again in 2 seconds");
    
          blink_led(3,200); //blink LED three times (200ms on duration) to show that MQTT server connection attempt failed
          // Wait 2 seconds before retrying
          delay(2000);
        }
  }
  
}

//this function will be executed whenever there is data available on subscribed topics
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  // Check if a message is received on the topic "rpi/broadcast"
  if (String(topic) == "rpi/broadcast") {
      if(messageTemp == "10"){
        Serial.println("Action: blink LED");
        blink_led(1,1250); //blink LED once (for 1250ms ON time)
      }
  }

  //Similarly add more if statements to check for other subscribed topics 
}

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(115200);

  setup_wifi();
  client.setServer(mqtt_server,1883);//1883 is the default port for MQTT server
  client.setCallback(callback);
}

void loop() {
  
  if (!client.connected()) {
    connect_mqttServer();
  }

  client.loop();
  
  long now = millis();
  if (now - lastMsg > 4000) {
    lastMsg = now;

    client.publish("esp32/sensor1", "88"); //topic name (to which this ESP32 publishes its data). 88 is the dummy value.
    
  }
  
}