Mini Weather Station using ATtiny85 and DHT22

Contents hide

1 Introduction

2 Hardware Components

3 DHT22 Pinout

4 Mini Weather Station Circuit

5 Connection Table

6 Code

7 Working Explanation

8 Applications and Uses

Introduction

Weather matters to all of us; good weather changes our moods, mind, and feelings. However, sometimes unexpected weather ruins our plan. It’s either a trip with our friends or a party with relatives if the weather is not better; it can spoil everything. And, therefore it is necessary to predict the weather, but for this, we need weather stations. So, here in this article, we will discuss How to make Weather Station using Attiny85 & SSD1306 OLED.

The weather station is basically the device used for weather observation and data collection. First and foremost, it gathers the most crucial information: temperature, atmospheric pressure, humidity, and so on. Here we are making a basic weather station with a DHT22.

This Project is sponsored by PCBWay. They have an open-source community, people can share their design projects with each other. Moreover, every time people place an order for your board, PCBWay will donate 10% of the cost of PCB to you, for your contribution to the Open Source Community.

Hardware Components

The following components are required to make Mini Weather Station Circuit

S.no	Component	Value	Qty
1.	Attiny85	–	1
2.	OLED Display Module	SSD1306	1
3.	Temp. & Humidity Sensor	DHT22	1
4.	PCB	–	1
5.	SMD Resistor	10k, 10k, 220	1, 1, 1
6.	SMD Switch	–	2
7.	Power Supply	3-5V	1
8.	Jumper wires	–	–

DHT22 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of DHT22

Mini Weather Station Circuit

Connection Table

DHT22	OLED Display	ATtiny85
VCC	Vcc	Vcc
GND	GND	GND
DAT	–	PB3
–	–	PB0
–	SCL	PB4
–	SDA	PB1
–	RES	Vcc
–	DC	GND
–	CS	PB3

Code

// Circuits DIY
// For Complete Details Visit -> https://circuits-diy.com  

#include "SSD1306_minimal.h"
#include <avr/pgmspace.h>

#define DEG "\xa7" "C"

SSD1306_Mini oled; // Declare the OLED object

void splash() {
 oled.startScreen();
 oled.clear(); // Clears the display

 oled.cursorTo(0, 0); // x:0, y:0
 oled.printString(" WEATHER STATION ");
 oled.cursorTo(0, 10); // x:0, y:23
 oled.printString("Temperature");
 oled.cursorTo(0, 20); // x:0, y:23
 oled.printString("Humidity");
 oled.cursorTo(0, 30); // x:0, y:23
 oled.printString("PCBWay.com"); 
}

void setup() {
 oled.init(0x3C); // Initializes the display to the specified address
 oled.clear(); // Clears the display
 delay(1000); // Delay for 1 second
 splash(); // Write something to the display (refer to the splash() method
}

void loop() {
}

Working Explanation

The working of this mini weather station is a simple DHT22 sensor sending data to the ATtiny85 microcontroller at D2 Digital Pin. ATtiny85 displays the received data using I2C communication on OLED Display.

Applications and Uses

Agriculture

Farms, and indeed agriculture on any scale, rely on weather data to direct many parts of their operations, such as the Irrigation of crops To help with planting decisions, keep an eye on the growing circumstances. Thus, this can help in agriculture.

Outdoor Sports

Many sports and leisure activities rely on the weather. Modern weather stations, with their capacity to automatically upload live weather data to a display, allow players to examine actual weather conditions before deciding to start.