The circuit at EasyEDA, the free online circuit design platform
Arduino Connection Pins
The code
JLCPCB - Make your own circuit boad from 2$
3D Parts
Well Done

Published September 12, 2019 © CC BY-NC-SA

Arduino Wireless Weather Station

In this DIY guide I will show you how to make your own wireless weather station.

AdvancedFull instructions provided2,505

Things used in this project

Hardware components

Master PCB Custom Circuit

Slave PCB Custom PCB

Microchip ATmega328

with Arduino UNO bootloader

28 dip socket

16 MHz Crystal

Capacitor 22 pF

Capacitor 100 nF

Capacitor 10 µF

Resistor 10k ohm

Screw Terminal 2P 2.54mm

Pin Header 1x5 Female 2.54mm

Basic 8x2 Character LCD - Black on Green 5V

Trimmer Potentiometer, 20 kohm

Wireless Serial Transceiver Module HC12

Push Button

DC Power Connector, Jack

Toggle Switch, Toggle

Arduino USB 2 Serial micro

Software apps and online services

Arduino IDE

Arduino Web Editor

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Soldering iron (generic)

Solder Wire, Lead Free

Story

Introduction

In this DIY guide I will show you how to make your own wireless weather station. In this project I decided to make my own PCB that is based on Arduino UNO microcontroller - Atmega328p.

Bellow you will find the electronic schematic with PCB layout so you can easily produce it.

~Project updates can be found here:

https://www.ardumotive.com/arduino-wireless-weathe...

Let's get started

1 / 5

The circuit at EasyEDA, the free online circuit design platform

EasyEDA is a free, zero- install, cloud-based EDA tool, designed to give electrical engineers, educators, engineering students and electronics hobbyists an Easier EDA Experience. It is easy to use circuit design, circuit simulator and PCB design that runs in your web browser.

Arduino Connection Pins

--> For Master StationLCD

RS pin to Arduino Pin 3 EN pin to Arduino Pin 4 D4 pin to Arduino Pin 5D5 pin to Arduino Pin 6D6 pin to Arduino Pin 7 D7 pin to Arduino Pin 11

DHT Sensor

Data pin to Arduino Pin 2

HC-12

TX pin to Arduino Pin 8RX pin to Arduino Pin 9

--> For Slave/Sensor StationDHT Sensor

Data pin to Arduino Pin 8

DS18B20 Sensor

Data pin to Arduino Pin 2

Photocell

to Arduino A0

The code

Connect your circuit with TTL to USB module with 5 cables to the programming header. The pins RX and TX must be cross-connected.

NOTE: If you are using the Arduino UNO board make sure to remove the ATmega328 IC from it first and connect the headers RX to RX and TX to TX pins of the board. The RS pin must be connected to Arduino UNO reset pin.

Download File

JLCPCB - Make your own circuit boad from 2$!

Enter here to produce your PCB board!

Use JLCPCB for $2 PCB Fabrication & 2-day Build Time, the quality is really good, check the below photo of our pcb board.

Download File

3D Parts

1 / 4

Download File

Well Done!

I hope you liked this, let me know in the comments!!!

Schematics

Code

/*  
 *  Weather Station - Arduino Based by Ardumotive.com
 *  Code for Master Unit - More info can be found at http://www.ardumotive.com/workshop.html 
 *  Dev: Michalis Vasilakis // Ver 1.0 // Date: 20/11/2018
 */

/***CONFIGURATION ****/
const long interval = 5000;  // ms
const int slaves = 1; //Number of slaves (max 16) (go to line 95 and complete the if statement for every sensor)
/*********************/
//Libraries
#include <LiquidCrystal.h>
#include <SoftwareSerial.h>
#include "DHT.h"
//DHT Sensor
#define DHTPIN 2
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE);
//LCD 16x2 Pinout
#define RS 3
#define EN 4
#define D4 5
#define D5 6
#define D6 7
#define D7 11
LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);
SoftwareSerial sSerial(8, 9); // RX, TX
//Variables
int temp=0;
int hum=0;
char incomingByte; 
String command;
boolean messageCompleted=false;
boolean newMessage=false;
unsigned long previousMillis = 0;        
int next=0;

void setup() {
  Serial.begin(9600);
  sSerial.begin(9600);
  lcd.begin(8,2);
  lcd.print("Weather");
  lcd.setCursor(0,1);
  lcd.print("Station");
}

void loop() {
  requestFromSlaves();
  communication();
}

void requestFromSlaves(){
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    if(next<slaves){
      String msg = "<D"+String(next,HEX)+">";
      sSerial.write(msg.c_str());
      next++;
    }
    else{
      readDHT(); //Read the sensor of the 'Master Station'
      next=0;
    }
    
  }
}

void communication(){
  if (sSerial.available()){
    incomingByte = sSerial.read();
    if(incomingByte=='>'){
      messageCompleted=true;
      newMessage=false;
    }
    else if (incomingByte=='<'){
      newMessage=true;
    }

    if (newMessage){
      command.concat(incomingByte);
    }
  }

  if(messageCompleted){
    if (command.charAt(1)=='S'){
      if (command.charAt(2)=='0'){   //<--- 0 is the number of slave sensor station address
        String msg = command.substring(3);
        lcd.clear();
        lcd.print("Balcony:"); //Change line 1 text
        lcd.setCursor(0,1);
        lcd.print(msg);
      }
      // Config for more sensors:
  /*  else if (command.charAt(2)=='1'){ //<--- 1 is the number of slave sensor station address
        String msg = command.substring(3);
        lcd.clear();
        lcd.print("My room:"); //Change line 1 text
        lcd.setCursor(0,1);
        lcd.print(msg);
      }
  */   
    }
    command="";
    messageCompleted=false;
  }
  
}

void readDHT(){
  hum = dht.readHumidity();
  temp = dht.readTemperature();
  String msg = String(temp) + "C " + String(hum) + "%";
  lcd.clear();
  lcd.print("Here...");
  lcd.setCursor(0,1);
  lcd.print(msg);
}

/*  
 *  Weather Station - Arduino Based by Ardumotive.com
 *  Code for Slave Sensor Unit with DHT sensor
 *  More info can be found at http://www.ardumotive.com/workshop.html 
 *  Dev: Michalis Vasilakis // Ver 1.0 // Date: 20/11/2018
 */

/***CONFIGURATION ****/
const long interval = 5000;  // ms
String ADDR = "0"; //Device address from 0 to f
#define SENSOR_TYPE 1 // Type of sensor in slave unit. Can be 1 for DHT, 2 for DS18B20 or 3 for PHOTOCELL
/*********************/
//Libraries
#include "DHT.h"
#include <OneWire.h>
#include <DallasTemperature.h>
//DHT Sensor
#define DHTPIN 8
#define DHTTYPE DHT22   // Change "DHT22" only if you are using a different DHT sensor (!). eg DHT11
DHT dht(DHTPIN, DHTTYPE);
//DS18B20
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
//Photocell
#define PHOTOCELL A0

//Variables
int temp=0;
int hum=0;
String res;
char incomingByte; 
String command;
boolean messageCompleted=false;
boolean newMessage=false;
String fromSensor;
unsigned long previousMillis = 0;       

void setup() {
  Serial.begin(9600);
  switch (SENSOR_TYPE) {
    case 1:
      dht.begin();
      break;
    case 2:
      sensors.begin();
      break;
    case 3:
      break;
  }
}

void loop() {
  communication();
  switch (SENSOR_TYPE) {
    case 1:
      readDHT();
      break;
    case 2:
      readDS18B20();
      break;
    case 3:
      readPhotocell();
      break;
  } 
}

void readDHT(){
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    hum = dht.readHumidity();
    temp = dht.readTemperature();
    fromSensor = "<S"+ADDR+String(temp) + "C " + String(hum) + "%>";
  }
}
void readDS18B20(){
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    sensors.requestTemperatures(); 
    temp = sensors.getTempCByIndex(0);
    fromSensor = "<S"+ADDR+ "Temp " + "C>";
  }
}
void readPhotocell(){
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    int photocellReading = analogRead(PHOTOCELL);
    if (photocellReading < 10) {
      res = "Dark";
    } else if (photocellReading < 200) {
      res = "Dim";
    } else if (photocellReading < 500) {
      res = "Light";
    } else if (photocellReading < 800) {
      res = "Bright";
    }
    fromSensor = "<S"+ADDR + res+">";
  }
}
void communication(){
  if (Serial.available()){
    incomingByte = Serial.read();
    if(incomingByte=='>'){
      messageCompleted=true;
      newMessage=false;
    }
    else if (incomingByte=='<'){
      newMessage=true;
    }
    if (newMessage){
      command.concat(incomingByte);
    }
  }
  if(messageCompleted){
    if (command.charAt(1)=='D'){
      if (command.substring(2)==ADDR){ 
        Serial.print(fromSensor);
      }
    }
    command="";
    messageCompleted=false;
  }
}

Arduino Wireless Weather Station