{"id":52295,"date":"2026-11-01T10:50:53","date_gmt":"2026-11-01T10:50:53","guid":{"rendered":"http:\/\/siratek.net\/index.php\/tutorials\/mini-weather-station\/"},"modified":"2026-11-01T10:50:53","modified_gmt":"2026-11-01T10:50:53","slug":"mini-weather-station","status":"publish","type":"siratek_tutorial","link":"https:\/\/siratek.net\/index.php\/tutorials\/mini-weather-station\/","title":{"rendered":"Project, a Mini Weather Station"},"content":{"rendered":"

<\/p>\n

What you will build<\/h2>\n

A small screen showing temperature, humidity and air pressure, with a three-hour pressure trend that tells you whether the weather is turning.<\/p>\n

Two sensors and a display, which does not sound like much. What makes it a project rather than three tutorials stacked together is that the three devices share one I2C bus and one small Arduino<\/strong>, and making that work teaches the things every multi-sensor build needs: address clashes, memory pressure, and the fact that one of your three parts is 3.3 V and the others are not.<\/p>\n

Before you begin<\/h2>\n

Parts<\/h3>\n\n\n\n\n\n\n\n\n\n
Part<\/th>\nSiratek product<\/th>\nIts own tutorial<\/th>\n<\/tr>\n<\/thead>\n
Arduino Uno<\/td>\n2219<\/td>\nGetting Started with Arduino Uno<\/em><\/td>\n<\/tr>\n
BMP280 pressure sensor<\/td>\n2910<\/td>\nPressure and Altitude with a BMP280<\/em><\/td>\n<\/tr>\n
DHT11 temperature and humidity<\/td>\n2837<\/td>\nRead Temperature and Humidity with DHT11<\/em><\/td>\n<\/tr>\n
0.96 inch OLED display<\/td>\n2459<\/td>\nA 0.96 inch OLED Display<\/em><\/td>\n<\/tr>\n
Breadboard and jumper wires<\/td>\n<\/td>\nUsing a Breadboard<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A logic level converter<\/strong>, Siratek 8440, is strongly recommended. See below.<\/p>\n

Three things to settle before wiring<\/h3>\n

The BMP280 is 3.3 V only.<\/strong> It has no regulator and no level shifter, so its VCC<\/code> goes to the Uno\u2019s 3.3V<\/code> pin. The OLED has a regulator and takes 5 V. Two devices on one bus wanting different supplies is the first real integration problem in this library, and Mixing 3.3 V and 5 V Safely<\/em> is the page that addresses it.<\/p>\n

For a bench build, powering the BMP280 from 3.3V<\/code> and sharing the bus works, and is out of specification for the reasons that page explains. For something you will keep, put a level converter between the Uno and the BMP280.<\/p>\n

The addresses do not clash, and you should confirm it anyway.<\/strong> The OLED answers at 0x3C and the BMP280 at 0x76. Run the bus scanner before building anything; thirty seconds now saves an hour later.<\/p>\n

The DHT11 is not on the bus at all.<\/strong> It has its own one-wire protocol and takes a digital pin of its own. Only two of the three devices share A4<\/code> and A5<\/code>.<\/p>\n

The memory problem, which decides the design<\/h3>\n

This project is the first in the library that genuinely runs out of RAM on an Uno, and it is worth understanding before you write anything.<\/p>\n\n\n\n\n\n\n\n\n
Consumer<\/th>\nApproximate RAM<\/th>\n<\/tr>\n<\/thead>\n
Adafruit SSD1306 screen buffer<\/td>\n1024 bytes<\/td>\n<\/tr>\n
Adafruit BMP280 and Unified Sensor<\/td>\na couple of hundred<\/td>\n<\/tr>\n
DHT library<\/td>\nmodest<\/td>\n<\/tr>\n
Everything else in your sketch<\/td>\nwhat is left of 2048<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

So the display alone takes half the board\u2019s memory<\/strong> before your variables exist. Add the three-hour history the trend needs and it gets tight.<\/p>\n

Three habits make it fit, and all three appear in the sketch below:<\/p>\n

    \n
  • Wrap every fixed string in F()<\/code><\/strong>, which keeps it in program memory.<\/li>\n
  • Store the pressure history as int<\/code>, not float<\/code>.<\/strong> Tenths of a hectopascal in a 16-bit integer is accurate enough and halves the array.<\/li>\n
  • Sample every ten minutes, not every second.<\/strong> Eighteen samples cover three hours; 10,800 would not fit and would tell you nothing more.<\/li>\n<\/ul>\n

    If the IDE warns about low memory, take it seriously here. It is the one project in this library where that warning is routinely the actual cause of trouble.<\/p>\n

    How it works<\/h2>\n

    The sketch has three jobs running at different rates, and none of them may block the others:<\/p>\n\n\n\n\n\n\n\n\n
    Job<\/th>\nHow often<\/th>\nWhy<\/th>\n<\/tr>\n<\/thead>\n
    Read the DHT11<\/td>\nEvery 2 seconds<\/td>\nIts minimum interval<\/td>\n<\/tr>\n
    Read the BMP280<\/td>\nEvery 2 seconds<\/td>\nFast; no reason to wait<\/td>\n<\/tr>\n
    Redraw the screen<\/td>\nEvery 2 seconds<\/td>\nMatches the readings<\/td>\n<\/tr>\n
    Record a pressure sample<\/td>\nEvery 10 minutes<\/td>\nEighteen of them is three hours<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    All four run from the millis()<\/code> pattern. There is no delay()<\/code> anywhere in loop()<\/code>.<\/p>\n

    The trend<\/strong> is the difference between the newest sample and the oldest, over three hours. The conventional threshold is 1.5 hPa: more than that falling suggests deteriorating weather, more than that rising suggests it is clearing. Those are meteorological conventions, not something the sensor knows.<\/p>\n

    Build it in stages<\/h2>\n

    Stage 1: scan the bus<\/h3>\n

    Before anything else, wire power and the two I2C lines to the OLED and the BMP280, and run the scanner from I2C, Two Wires and Many Devices<\/em>.<\/p>\n

    You should see 0x3C<\/strong> and 0x76<\/strong>. If you see only one, that device is wired and the other is not. If you see neither, SDA<\/code> and SCL<\/code> are swapped.<\/p>\n

    Do not proceed until both appear. Everything after this depends on it.<\/p>\n

    Stage 2: the display alone<\/h3>\n

    Get \u201cSiratek\u201d onto the screen with the OLED tutorial\u2019s example. That proves the display, the libraries and the memory situation in one step.<\/p>\n

    Note the memory figure the IDE reports. You will watch it fall as the project grows.<\/p>\n

    Stage 3: one sensor at a time<\/h3>\n

    Add the BMP280 and print pressure to the serial monitor. Then add the DHT11 and print temperature and humidity. Serial first, screen second: a reading that is wrong is much easier to see as a number than as part of a layout.<\/p>\n

    Stage 4: put it together<\/h3>\n

    The complete sketch below.<\/p>\n

    Pin reference<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Device<\/th>\nPin<\/th>\nConnect to<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
    OLED<\/td>\nGND<\/code><\/td>\nUno GND<\/code><\/td>\n<\/td>\n<\/tr>\n
    OLED<\/td>\nVDD<\/code><\/td>\nUno 5V<\/code><\/td>\nIt has a regulator<\/td>\n<\/tr>\n
    OLED<\/td>\nSCK<\/code><\/td>\nUno A5<\/code><\/td>\nI2C clock, despite the name<\/td>\n<\/tr>\n
    OLED<\/td>\nSDA<\/code><\/td>\nUno A4<\/code><\/td>\n<\/td>\n<\/tr>\n
    BMP280<\/td>\nGND<\/code><\/td>\nUno GND<\/code><\/td>\n<\/td>\n<\/tr>\n
    BMP280<\/td>\nVCC<\/code><\/td>\nUno 3.3V<\/code><\/strong><\/td>\nNever 5 V<\/strong><\/td>\n<\/tr>\n
    BMP280<\/td>\nSCL<\/code><\/td>\nUno A5<\/code><\/td>\nShared bus<\/td>\n<\/tr>\n
    BMP280<\/td>\nSDA<\/code><\/td>\nUno A4<\/code><\/td>\nShared bus<\/td>\n<\/tr>\n
    DHT11<\/td>\n+<\/code><\/td>\nUno 5V<\/code><\/td>\n<\/td>\n<\/tr>\n
    DHT11<\/td>\nOUT<\/code><\/td>\nUno D2<\/code><\/td>\nNot on the bus<\/td>\n<\/tr>\n
    DHT11<\/td>\n-<\/code><\/td>\nUno GND<\/code><\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \"A
    Two devices on one bus at different supply voltages, and a third that is not on the bus at all.<\/figcaption><\/figure>\n

    The complete sketch<\/h2>\n
    \/\/ Siratek: a mini weather station.\n\/\/ BMP280 and OLED share the I2C bus; the DHT11 has its own pin.\n\n#include <Wire.h>\n#include <Adafruit_GFX.h>\n#include <Adafruit_SSD1306.h>\n#include <Adafruit_BMP280.h>\n#include <DHT.h>\n\nAdafruit_SSD1306 display(128, 64, &Wire, -1);\nAdafruit_BMP280 bmp;\nDHT dht(2, DHT11);\n\n\/\/ Eighteen samples at ten minutes is three hours.\nconst int HISTORY = 18;\nint pressureTenths[HISTORY];      \/\/ hPa x 10, as int to save RAM\nint samples = 0;\n\nconst unsigned long READ_EVERY   = 2000;\nconst unsigned long SAMPLE_EVERY = 600000UL;\n\nunsigned long lastRead = 0;\nunsigned long lastSample = 0;\n\nfloat temperature = NAN;\nfloat humidity = NAN;\nfloat pressure = NAN;\n\nvoid setup() {\n  Serial.begin(9600);\n\n  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {\n    Serial.println(F(\"no display at 0x3C\"));\n    for (;;) { delay(100); }\n  }\n  display.clearDisplay();\n  display.setTextColor(SSD1306_WHITE);\n  display.setTextSize(1);\n  display.setCursor(0, 0);\n  display.println(F(\"Siratek\"));\n  display.println(F(\"starting...\"));\n  display.display();\n\n  if (!bmp.begin(0x76)) {\n    Serial.println(F(\"no BMP280 at 0x76: check VCC is on 3.3V\"));\n  }\n\n  dht.begin();\n\n  lastRead = millis() - READ_EVERY;\n  lastSample = millis() - SAMPLE_EVERY;\n}\n\nvoid takeReadings() {\n  float t = dht.readTemperature();\n  float h = dht.readHumidity();\n\n  \/\/ Keep the last good value rather than displaying nan.\n  if (!isnan(t)) temperature = t;\n  if (!isnan(h)) humidity = h;\n\n  pressure = bmp.readPressure() \/ 100.0F;\n}\n\nvoid recordSample() {\n  for (int i = HISTORY - 1; i > 0; i--) {\n    pressureTenths[i] = pressureTenths[i - 1];\n  }\n  pressureTenths[0] = (int) (pressure * 10.0F);\n\n  if (samples < HISTORY) {\n    samples++;\n  }\n}\n\n\/\/ Returns the three-hour change in hPa, or NAN while still collecting.\nfloat trend() {\n  if (samples < HISTORY) {\n    return NAN;\n  }\n  return (pressureTenths[0] - pressureTenths[HISTORY - 1]) \/ 10.0F;\n}\n\nvoid draw() {\n  display.clearDisplay();\n\n  display.setTextSize(1);\n  display.setCursor(0, 0);\n  display.print(F(\"Siratek\"));\n\n  display.setTextSize(2);\n  display.setCursor(0, 14);\n  if (isnan(temperature)) {\n    display.print(F(\"--\"));\n  } else {\n    display.print(temperature, 1);\n  }\n  display.setTextSize(1);\n  display.print(F(\" C\"));\n\n  display.setTextSize(1);\n  display.setCursor(0, 36);\n  display.print(F(\"humidity  \"));\n  if (isnan(humidity)) {\n    display.print(F(\"--\"));\n  } else {\n    display.print(humidity, 0);\n  }\n  display.print(F(\" %\"));\n\n  display.setCursor(0, 46);\n  display.print(F(\"pressure  \"));\n  display.print(pressure, 1);\n\n  display.setCursor(0, 56);\n  float change = trend();\n  if (isnan(change)) {\n    display.print(F(\"collecting history\"));\n  } else if (change < -1.5) {\n    display.print(F(\"falling: unsettled\"));\n  } else if (change > 1.5) {\n    display.print(F(\"rising: clearing\"));\n  } else {\n    display.print(F(\"steady\"));\n  }\n\n  display.display();\n}\n\nvoid loop() {\n  if (millis() - lastRead >= READ_EVERY) {\n    lastRead = millis();\n    takeReadings();\n    draw();\n  }\n\n  if (millis() - lastSample >= SAMPLE_EVERY) {\n    lastSample = millis();\n    recordSample();\n\n    Serial.print(F(\"sample \"));\n    Serial.print(samples);\n    Serial.print(F(\"\/\"));\n    Serial.print(HISTORY);\n    Serial.print(F(\"  \"));\n    Serial.println(pressure, 1);\n  }\n}<\/code><\/pre>\n
    Three decisions worth explaining<\/h3>\n
    Last good values are kept.<\/strong> A DHT11 read fails occasionally, and a screen showing nan<\/code> looks broken. Keeping the previous reading and only replacing it on success means a momentary failure is invisible, which is correct for a display that updates every two seconds.<\/p>\n
    clearDisplay()<\/code> is used freely.<\/strong> That is the opposite of the advice in the LCD tutorial, and right for the reason given there: on an OLED it clears a RAM buffer, and the screen only changes when display()<\/code> is called, so there is no flicker.<\/p>\n
    The trend says \u201ccollecting history\u201d for three hours.<\/strong> A project that silently shows \u201csteady\u201d before it has any data is lying. Saying what it is doing costs one branch.<\/p>\n
    Testing it<\/h2>\n\n\n\n\n\n\n\n\n\n
    Try this<\/th>\nIt should<\/th>\n<\/tr>\n<\/thead>\n
    Breathe gently near the DHT11<\/td>\nHumidity climbs several percent, then falls back<\/td>\n<\/tr>\n
    Hold the BMP280 and lift it a metre<\/td>\nPressure falls by about 0.1 hPa<\/td>\n<\/tr>\n
    Disconnect the DHT11<\/td>\nTemperature freezes at its last value, everything else carries on<\/td>\n<\/tr>\n
    Leave it three hours<\/td>\nThe trend line changes from \u201ccollecting history\u201d<\/td>\n<\/tr>\n
    Check the IDE\u2019s memory report<\/td>\nComfortably above 200 bytes free<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    The third is the one worth doing deliberately. Pulling a wire and watching the rest of the project continue is how you find out whether you built something robust or something brittle.<\/p>\n
    Making it yours<\/h2>\n
      \n
    • Log it.<\/strong> Add the SD card module and write a line every ten minutes alongside the sample. The data logger project does exactly this, and a month of pressure plotted in a spreadsheet is genuinely interesting.<\/li>\n
    • A real timestamp.<\/strong> The DS3231 gives each reading a date and time rather than an elapsed count.<\/li>\n
    • Swap the DHT11 for a DHT22.<\/strong> One word in the constructor, and you get a tenth of a degree instead of whole numbers. DHT22, Better Accuracy Than the DHT11<\/em> covers it.<\/li>\n
    • Move it to an ESP32.<\/strong> Everything becomes 3.3 V so the level question disappears, the memory pressure vanishes, and the MQTT project puts the readings on your phone.<\/li>\n<\/ul>\n
      That last one is the honest upgrade path. This project fits on an Uno, and only just.<\/p>\n
      Troubleshooting<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      Symptom<\/th>\nLikely cause<\/th>\nCheck or fix<\/th>\n<\/tr>\n<\/thead>\n
      Scanner finds nothing<\/td>\nSDA<\/code> and SCL<\/code> swapped<\/td>\nSDA<\/code> is A4<\/code>, SCL<\/code> is A5<\/code><\/td>\n<\/tr>\n
      Scanner finds only 0x3C<\/td>\nBMP280 not powered<\/td>\nCheck VCC<\/code> is on 3.3V<\/code><\/td>\n<\/tr>\n
      BMP280 dead after working<\/td>\n5 V applied to it<\/td>\nThat board is 3.3 V only<\/td>\n<\/tr>\n
      Display blank<\/td>\ndisplay()<\/code> not called, or wrong address<\/td>\nBoth are in setup()<\/code><\/td>\n<\/tr>\n
      Garbled display, random resets<\/td>\nOut of RAM<\/td>\nF()<\/code> on every string; keep history small<\/td>\n<\/tr>\n
      Temperature shows --<\/code><\/td>\nDHT11 read failing<\/td>\nCheck the 2 second interval and the wiring<\/td>\n<\/tr>\n
      Pressure reads 0<\/td>\nBMP280 not found<\/td>\nLook at the startup message<\/td>\n<\/tr>\n
      Trend never appears<\/td>\nFewer than 18 samples yet<\/td>\nThree hours at ten minutes each<\/td>\n<\/tr>\n
      Readings freeze<\/td>\nA delay()<\/code> in loop()<\/code><\/td>\nEverything is on millis()<\/code><\/td>\n<\/tr>\n
      Works alone, fails together<\/td>\nAddress clash or supply<\/td>\nScan with both connected<\/td>\n<\/tr>\n
      Temperature reads a degree or two high<\/td>\nSelf-heating, and the board nearby<\/td>\nMount the DHT11 away from the Uno<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      Sources and attribution<\/h2>\n
      All text, wiring guidance and code in this project are original Siratek work.<\/p>\n
        \n
      • Component behaviour is as described in Pressure and Altitude with a BMP280<\/em>, Read Temperature and Humidity with DHT11<\/em> and A 0.96 inch OLED Display<\/em>, including the BMP280\u2019s 3.3 V supply limit, the DHT11\u2019s two-second interval and the display\u2019s 1024-byte RAM buffer.<\/li>\n
      • The three-hour window and the 1.5 hPa threshold are conventional meteorological practice rather than properties of the sensor.<\/li>\n<\/ul>\n
        No third-party tutorial text, diagrams, photographs or code has been reproduced here.<\/p>\n
        <\/p>\n<\/body>","protected":false},"excerpt":{"rendered":"
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