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ESP32-nano base multi-function temperature and humidity sensor

Overview

This is an esp32-nano base connected to a DHT11 temperature and humidity sensor and a 4P OLED display. The technical content is not high and the welding is also very simple. There is a chip resistor and a chip capacitor. Pay attention to the alignment direction when connecting.

1306 display(0x3c, 26, 27 ) ;//SDA SCL//13 15 #include
Arduino 3.0_SSD1306_display( 0x3c , 26 , 27 ) ;//SDA SCL// 13 15 #include #include #include #define DHTPIN 25 #define DHTTYPE DHT11 DHT_Unified dht(DHTPIN, DHTTYPE); uint32_t delayMS; int Tline[55] = {0}; int Hline[55] = {0}; int led = 22; bool ledmode = 1, count = 1; void setup() { display.setFont(ArialMT_Plain_10); for(int i = 0; i <= 45; ++i){ display.init(); display.drawString(i, 25, "BY"); display.drawString(110 - i, 25, "CY");//The opening animation can be renamed display.display(); delay(10); } Serial.begin(115200 ); dht.begin(); pinMode(led, OUTPUT); Serial.println("Modified Temperature, Humidity Serial Monitor Example"); sensor_t sensor; dht.temperature().getSensor(&sensor); dht.humidity().getSensor(&sensor); delayMS = 1000; } void loop() { // put your main code here, to run repeatedly: delay(delayMS); sensors_event_t event; dht.temperature().getEvent(&event); int warn = 0; char T[10]; float Te; dtostrf(event.temperature,3,1,T); if (isnan(event.temperature)) { Serial.println("Error reading temperature!"); } else { Te = event.temperature; } dht.humidity().getEvent(&even t); char H[10]; dtostrf(event.relative_humidity,3,1,H); if (isnan(event.relative_humidity)) { Serial.println("Error reading humidity!"); } else { float Hu = event.relative_humidity; //float Fa = 1.8 * Te + 32; //float comfort = Fa - (0.55 - 0.55 * Hu) * (Fa - 58); float comfort = (1. 1818 * Te + 18.18) * (0.88 + 0.002 * Hu) + (Te - 32) / (45 - Te) + 17.4; char COMFORT[10]; Serial.println(comfort);

dtostrf(comfort,3,1,COMFORT);
int showx = 50;
display.init();

if(comfort < 0){ //舒适度评价
display.drawString(showx, 10, "ice");
warn = 2;
}
else if(comfort < 25){
display.drawString(showx, 10, "very cold");
warn = 2;
}
else if(comfort < 38){
display.drawString(showx, 10, "cold");
warn = 1;
}
else if(comfort < 50){
display.drawString(showx, 10, "a little cold");
warn = 1;
}
else if(comfort < 58){
display.drawString(showx, 10, "comfortable");
warn = 0;
}
else if(comfort < 70){
display.drawString(showx, 10, "best");
warn = 0;
}
else if(comfort < 75){
display.drawString(showx, 10, "comfortable");
warn = 0;
}
else if(comfort < 79){
display.drawString(showx, 10, "a little hot");
warn = 1;
}
else if(comfort < 84){
display.drawString(showx, 10, "hot");
warn = 1;
}
else if(comfort < 88){
display.drawString(showx, 10, "very hot");
warn = 2;
}
else{
display.drawString(showx, 10, "torridity");
warn = 2;
}

//Very uncomfortable 18
//uncomfortable 13
display.drawString(0, 0, "T: C comfort:");
display.drawString(0, 10, "H: %"); //x,y
display.drawString(12, 0, T);
display.drawString(12, 10, H);
display.drawString(90, 0, COMFORT);

//开始绘制折线

display.drawLine(5, 23, 5, 63);//T坐标轴
display.drawString(3, 20, "^");
display.drawLine(5, 63, 55, 63);
display.drawString(56, 55, "T");

display.drawLine(68, 23, 68, 63);//H坐标轴
display.drawString(66, 20, "^");
display.drawLine(68, 63, 118, 63);
display.drawString(119, 55, "H");

Te = (int)(Te);
Hu = (int)(Hu);
Serial.println(Te);
Serial.println(Hu);
for(int i = 1; i <= 50; ++i){//T折线(笨方法)
Tline[i - 1] = Tline[i];
}
Tline[50] = Te;
for(int i = 1; i < 50; ++i){
display.drawLine(i + 4, 103 - Tline[i] * 2, i + 5, 103 - Tline[i + 1] * 2);
}

for(int i = 1; i <= 50; ++i){//H折线
Hline[i - 1] = Hline[i];
}
Hline[50] = Hu;
for(int i = 1; i < 50; ++i){
display.drawLine(i + 67, 63 - (Hline[i] / 2.5), i + 68, 63 - (Hline[i + 1] / 2.5));
}

if(warn == 1){ //舒适度报警
display.drawString(120, 10, "!");
if(count){
ledmode = !ledmode;
digitalWrite(led, ledmode);
count = 0;
}
else{
count = 1;
}
}
else if(warn == 2){
display.drawString(120, 10, "!!");
ledmode = !ledmode;
digitalWrite(led, ledmode);
}
else{
ledmode = 1;
digitalWrite(led, ledmode);
}

display.display();
}
}
```
初代代码（仅有显示温湿度功能）
```
#include "SSD1306.h"

SSD1306 display(0x3c, 26, 27);//SDA SCL//13 15

//

#include
#include
#include
#define DHTPIN 25 // Pin which is connected to the DHT sensor.

#define DHTTYPE DHT11
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;

void setup() {
display.setFont(ArialMT_Plain_24);
for(int i = 0; i <= 30; ++i){
display.init();//清屏
//display.setFont(ArialMT_Plain_24);
display.drawString(i, 18, "BY");
display.drawString(100 - i, 18, "CY");
display.display();//刷新
delay(10);
}
// put your setup code here, to run once:
Serial.begin(115200);
dht.begin();
Serial.println("Modified Temperature, Humidity Serial Monitor Example");
sensor_t sensor;
dht.temperature().getSensor(&sensor);
dht.humidity().getSensor(&sensor);
//delayMS = sensor.min_delay / 1000;
delayMS = 1000;
}

void loop() {
// put your main code here, to run repeatedly:
delay(delayMS);
sensors_event_t event;
dht.temperature().getEvent(&event);

char T[10];
dtostrf(event.temperature,3,1,T);

if (isnan(event.temperature)) {
Serial.println("Error reading temperature!");
}
else {

}
dht.humidity().getEvent(&event);

char H[10];
dtostrf(event.relative_humidity,3,1,H);

if (isnan(event.relative_humidity)) {
Serial.println("Error reading humidity!");
}
else {
display.init();//清屏
//display.setFont(ArialMT_Plain_24);
display.drawString(0, 30, "H:");
display.drawString(35, 30, H);
display.drawString(95, 30, "%");
display.drawString(0, 0, "T:");
display.drawString(35, 0, T);
display.drawString(95, 0, "C");
display.display();//刷新
display.display();//刷新
}
}
```

Design Files

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