Doug Domke
Published © GPL3+

Tiny Internet Weather Station

An easy to build simple weather station that connects to your smartphone via WiFi and Blynk.

IntermediateFull instructions provided25,150
Tiny Internet Weather Station

Things used in this project

Hardware components

Arduino Nano 33 IoT
Arduino Nano 33 IoT
BME weather sensor
0.96 in OLED display - 128x 64
Plastic Case 3.9" x 2.7"
Micro USB cable
Male to Female breadboard jumper wires
USB Wall Charger

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Hot glue gun (generic)
Hot glue gun (generic)


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Schematic for Tiny Internet Weather Station


Tiny Internet Weather Station

With WiFi and Blynk to Smartphone
This sketch is for the Arduino Nano 33 IoT
It uses a BME280 sensor board
It uses a 0.96 inch 128 x 64 OLED display
It connects through WiFi to the Blynk cloud server for display of weather data on a smartphone
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BME280.h>  // BME280 library
#include <avr/dtostrf.h>  // used to convert weather numbers to strings for display on OLED
#include <ss_oled.h>  // OLED library
// Next two includes required to make Nano 33 IoT work with Blynk
#include <WiFiNINA.h>
#include <BlynkSimpleWiFiNINA.h>

char auth[] = "YourBlynkProjectCode";
char ssid[] = "YourWifiID";
char pass[] = "YourWiFiPassword";

Adafruit_BME280 bme; // use I2C interface
Adafruit_Sensor *bme_temp = bme.getTemperatureSensor();
Adafruit_Sensor *bme_pressure = bme.getPressureSensor();
Adafruit_Sensor *bme_humidity = bme.getHumiditySensor();

#define SDA_PIN 5
#define SCL_PIN 4
#define RESET_PIN -1
#define OLED_ADDR -1
#define FLIP180 0
#define INVERT 0
#define USE_HW_I2C 0
#define MY_OLED OLED_128x64
#define OLED_WIDTH 128
#define OLED_HEIGHT 64

SSOLED ssoled; // instance of OLED

BlynkTimer timer;  // instance of Blynk timer

void setup() {
  if (!bme.begin(0x76)) {  // wait until sensor is detected
    while (1) delay(10);
  oledInit(&ssoled, MY_OLED, OLED_ADDR, FLIP180, INVERT, USE_HW_I2C, SDA_PIN, SCL_PIN, RESET_PIN, 400000L);
  oledFill(&ssoled, 0x0, 1);
  Blynk.begin(auth, ssid, pass);  // comment this line out to operate weather station without Blynk
  timer.setInterval(60000L, myupdate);  // runs myupdate once per minute
  myupdate();  // run an initial update of display and data to Blynk because main loop waits one minute

void loop() {;   // Blynk prefers to run by itself in the main loop.;   // Everything else is handled through Blynk timer

// this routine is called by the Blynk timer to update both the OLED display and push data to Blynk
void myupdate(){
  sensors_event_t temp_event, pressure_event, humidity_event;
  float ctemp = temp_event.temperature;  // get temp in centigrade
  float ftemp = 32 + (9*ctemp)/5;  // convert temp to fahrenheit
  float hum = humidity_event.relative_humidity;  // get relative humidity
  float ppress = pressure_event.pressure; // get pressure in mm
  float mpress = 1.3 + ppress/33.8939; // convert to inch Hg and add 1.3 to match actual locally reported barometric
                                       // pressure.  You may want to remove the 1.3 and/or add your own adjustment. 
  char mytemp[8]; 
  dtostrf(ftemp, 6, 2, mytemp); // convert temp to a string
  char myhum[8]; 
  dtostrf(hum, 6, 2, myhum); // convert humidity to a string
  char mypress[8]; 
  dtostrf(mpress, 6, 2, mypress); // convert pressure to a string
  // update OLED display
  oledWriteString(&ssoled, 0,2,1,(char *)"Weather Station", FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,2,3,(char *)"Temp = ", FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,50,3,(char *)mytemp, FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,105,3,(char *)"F", FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,2,5,(char *)"Humid=", FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,50,5,(char *)myhum, FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,105,5,(char *)"%", FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,2,7,(char *)"Press=", FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,50,7,(char *)mypress, FONT_NORMAL, 0, 1);
  oledWriteString(&ssoled, 0,105,7,(char *)"in", FONT_NORMAL, 0, 1);
  // push new weather data to Blynk
  Blynk.virtualWrite(V3, ftemp);
  Blynk.virtualWrite(V4, hum); 
  Blynk.virtualWrite(V5, mpress);  


Doug Domke

Doug Domke

1 project • 86 followers


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