Comprehensive Project: Arduino Uno Temperature and Humidity Meter

Performance Parameters① Main Control Chip: ATmega328P② Digital Input/Output Pins: 14③ PWM Pins: 6④ Storage (Code Space) 32KB⑤ RAM (Runtime Storage) 2KB; EEPROM (Power-off Storage) 1KB⑥ Crystal Oscillator 16MHzOnline Simulation: https://wokwi.com/

Arduino Uno Tutorial ①: Install Arduino IDE

Arduino Uno Tutorial ②: Development Board and LED Testing Arduino Uno Tutorial ③: Button Control LED, with Practice Questions Arduino Uno Tutorial ④: Analog Quantity, Using ADC to Measure Voltage Arduino Uno Tutorial ⑤: External Interrupt, with Practice QuestionsArduino Uno Tutorial ⑥: Serial Communication, Sending and ReceivingArduino Uno Tutorial ⑦: 0.96 Inch OLED Screen Arduino Uno Tutorial ⑧: 0.96 Inch OLED Screen Chinese & Image DisplayArduino Uno Tutorial ⑨: DHT11 Temperature and Humidity SensorArduino Uno Tutorial ⑩: Comprehensive Project – Temperature and Humidity Meter

(1) IntroductionWe have previously learned about the OLED screen and DHT11 temperature and humidity sensor, so we can create a simple temperature and humidity meter project that displays DHT11’s temperature and humidity data through the OLED screen.OLED Tutorial: 【Arduino Uno Tutorial】 (VII) 0.96 Inch OLED Screen DHT11 Tutorial: 【Arduino Uno Tutorial】 (IX) DHT11 Temperature and Humidity Sensor(2) Program① Import Library Files

#include &lt;dht11.h&gt;#include &lt;U8g2lib.h&gt;#include &lt;Wire.h&gt;

② Define SCL Pin A5, SDA Pin A4 Set U8G2 Screen Library Pins, and Define DHT11 Sensor and Pins

#define BOARD_I2C_SCL   A5#define BOARD_I2C_SDA   A4   U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ BOARD_I2C_SCL, /* data=*/ BOARD_I2C_SDA, /* reset=*/ U8X8_PIN_NONE);  dht11 DHT11;//Define Sensor Type#define DHT11PIN 2//Define Sensor Connection Pin.

③ Define the Character Pattern for the Word “Temperature and Humidity”

uint8_t day[][32] ={{0x00,0x00,0xC4,0x1F,0x48,0x10,0x48,0x10,0xC1,0x1F,0x42,0x10,0x42,0x10,0xC8,0x1F,0x08,0x00,0xE4,0x3F,0x27,0x25,0x24,0x25,0x24,0x25,0x24,0x25,0xF4,0x7F,0x00,0x00},/*"Temperature",0*/{0x00,0x00,0xE4,0x1F,0x28,0x10,0x28,0x10,0xE1,0x1F,0x22,0x10,0x22,0x10,0xE8,0x1F,0x88,0x04,0x84,0x04,0x97,0x24,0xA4,0x14,0xC4,0x0C,0x84,0x04,0xF4,0x7F,0x00,0x00},/*"Humidity",1*/{0x80,0x00,0x00,0x01,0xFC,0x7F,0x44,0x04,0x44,0x04,0xFC,0x3F,0x44,0x04,0x44,0x04,0xC4,0x07,0x04,0x00,0xF4,0x0F,0x24,0x08,0x42,0x04,0x82,0x03,0x61,0x0C,0x1C,0x70},/*"Degree",2*/};

④ Initialize Function Set Serial Communication, Baud Rate 115200 Set U8G2 Initialization, and Set Font

void setup(){    Serial.begin(115200);    Serial.println("Init u8g2 ....");  u8g2.begin();  u8g2.setFont(u8g2_font_ncenB08_tr); //Set Font}

⑤ Loop Function Set temp and humi Two Integer Variables DHT11 Read Sensor Information Save DHT11 Sensor Data in Variables Each Time the Screen is Updated, Clear the Cache U8G2 Set Chinese and Variables, and Upload the Cache to the Screen

void loop() {  int temp = 0;  int humi = 0;  DHT11.read(DHT11PIN); //Update all sensor information    humi = DHT11.humidity;  temp = DHT11.temperature;   u8g2.clearBuffer();  //Clear Cache     u8g2.drawXBM(2,2,16,16,day[0]);  u8g2.drawXBM(18,2,16,16,day[2]);  u8g2.drawXBM(2,30,16,16,day[1]);  u8g2.drawXBM(18,30,16,16,day[2]);  u8g2.setCursor (50, 14);  u8g2.println(temp);  u8g2.setCursor (50, 42);  u8g2.println(humi);   u8g2.sendBuffer();   Serial.print("Current Temperature (℃): ");  Serial.println(temp);  Serial.print("Current Humidity (%): ");  Serial.println(humi);   delay(2000);}

⑥ Phenomenon Display

⑦ Complete Code

#include &lt;dht11.h&gt;//Import DHT11 Library#include &lt;U8g2lib.h&gt;#include &lt;Wire.h&gt;#define BOARD_I2C_SCL   A5#define BOARD_I2C_SDA   A4   U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ BOARD_I2C_SCL, /* data=*/ BOARD_I2C_SDA, /* reset=*/ U8X8_PIN_NONE);  /********************###Define###********************/dht11 DHT11;//Define Sensor Type#define DHT11PIN 2//Define Sensor Connection Pin. uint8_t day[][32] ={{0x00,0x00,0xC4,0x1F,0x48,0x10,0x48,0x10,0xC1,0x1F,0x42,0x10,0x42,0x10,0xC8,0x1F,0x08,0x00,0xE4,0x3F,0x27,0x25,0x24,0x25,0x24,0x25,0x24,0x25,0xF4,0x7F,0x00,0x00},/*"Temperature",0*/{0x00,0x00,0xE4,0x1F,0x28,0x10,0x28,0x10,0xE1,0x1F,0x22,0x10,0x22,0x10,0xE8,0x1F,0x88,0x04,0x84,0x04,0x97,0x24,0xA4,0x14,0xC4,0x0C,0x84,0x04,0xF4,0x7F,0x00,0x00},/*"Humidity",1*/{0x80,0x00,0x00,0x01,0xFC,0x7F,0x44,0x04,0x44,0x04,0xFC,0x3F,0x44,0x04,0x44,0x04,0xC4,0x07,0x04,0x00,0xF4,0x0F,0x24,0x08,0x42,0x04,0x82,0x03,0x61,0x0C,0x1C,0x70},/*"Degree",2*/}; void setup(){    Serial.begin(115200);    Serial.println("Init u8g2 ....");  u8g2.begin();  u8g2.setFont(u8g2_font_ncenB08_tr); //Set Font} void loop() {  int temp = 0;  int humi = 0;  DHT11.read(DHT11PIN); //Update all sensor information    humi = DHT11.humidity;  temp = DHT11.temperature;   u8g2.clearBuffer();  //Clear Cache     u8g2.drawXBM(2,2,16,16,day[0]);  u8g2.drawXBM(18,2,16,16,day[2]);  u8g2.drawXBM(2,30,16,16,day[1]);  u8g2.drawXBM(18,30,16,16,day[2]);  u8g2.setCursor (50, 14);  u8g2.println(temp);  u8g2.setCursor (50, 42);  u8g2.println(humi);   u8g2.sendBuffer();   Serial.print("Current Temperature (℃): ");  Serial.println(temp);  Serial.print("Current Humidity (%): ");  Serial.println(humi);   delay(2000);}

This Arduino Uno Beginner Tutorial is complete.

END

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Comprehensive Project: Arduino Uno Temperature and Humidity Meter

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