Measure Temperature and Humidity using M5Stack Core 2 with DHT11 and DHT22
Measure Temperature and Humidity using M5Stack Core 2 ESP32 with DHT11 and DHT22 )
Learn how to measure temperature and humidity with DHT11, DHT22, DHT21 sensor with M5Stack Core 2. First learn how to prepare Arduino IDE to work with M5Stack Core 2 ESCP3 device. Then wiring diagram for DHT11 DHT22 with PCB and bare module with resistor is shown. Actual wiring is shown next for all 3 modules. Then code is fully explained so you know how to customize it.
At the end measuring temperature and humidity is demonstrated using DHT11 and DHT22.
What values can this code show?
In the code where it says unsigned int unit=3; change the unit=0 to 5
0=C celsius
1=F fahrenheit
2=Humidity
3=C celsius and Humidity
4=F fahrenheit and Humidity
5=C celsius and F fahrenheit
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Required Videos to watch
-Introduction to M5Stack Core2 ESP32 module-Introduction to VL53L0X
Chapters in this video
- 00:55 Introduction
- 03:48 Wiring Explained
- 07:33 Arduino IDE Drivers
- 09:06 Code Explained
- 21:00 Measuring temperature with DHT11, DHT22
M5Stack Core2 wiht DHT11 DHT22: Main
Click on image to enlarge
Resources for this module
- M5Stack Core2 Documention page
- M5Stack Core2 Product page
- ESP32-D0WDQ6-V3 Datasheet (pdf)
- Robojax Crash Course on Arduino: Learn Arduino in 30 Minutes (code and video)
- Robojax Arduino Course on Udemy
- Get Early Access to my videos via Patreon
M5Stack Core 2 ESP32 with DHT11 and DHT22
/*
* file: M5Stack_DHT11_DHT22
Measure Temperature and Humidity using DHT11, DHT22, DHT21 Sensor and dispaly on M5Stack Core 2 ESP32 IoT board
* Written by Ahmad Shamshiri on April 22, 2021 in Ontario, Canada
* Watch video instruciton https://youtu.be/ZDZm_QOlCJo
www.Robojax.com youTube http://youTube.com/robojaxTV
*
*
* This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.*
* This code has been download from Robojax.com
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <M5Core2.h>
const int refresh=3000;//read every 3 seconds
unsigned int unit=3;//
// 0=C celsius
// 1=F fahrenheit
// 2=Humidity
// 3=C and Humidity
// 4=F and Humidity
// 5=C and F
char *title[]={"Temperature","Temperature","Humidity"};
char *unitText[]={"C","F","%"};
//set more color. see https://docs.m5stack.com/#/en/api/lcd
unsigned int backgroundColor= YELLOW;
unsigned int temperatureTitleColor= BLACK;
unsigned int temperatureValueColor= RED;
unsigned int humidityTitleColor= BLACK;
unsigned int humidityValueColor= RED;
unsigned int background2Color= TFT_CYAN;
uint8_t titleV,unitV,degree;
uint8_t line1TitleY=3;
uint8_t line1ValueY=40;
uint8_t line2TitleY=110;
uint8_t line2ValueY=150;
#include "DHT.h"
#define DHTPIN 27
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);
float temperatureCValue,temperatureFValue, humidityValue,myValue1,myValue2;//
// ****** DHT settings end (Robojax.com )
void readTemperature();
void displayTemperature(uint8_t line );
void setup() {
M5.begin();
M5.Lcd.setTextSize(4);
Serial.begin(9600);//default is 115200
Serial.println("M5Stack DHT Test ");
// Robojax.com code for ESP32 DHT11 DHT22
dht.begin();
delay(1000);
}
void loop() {
readTemperature();//reads the temperature and humidity
displayMyValue();//displays tempereture or humidity
//printOnSerial();
delay(refresh);
}
/*
* www.robojax.com
* see video https://youtu.be/ZDZm_QOlCJo
* for details
*/
void readTemperature()
{
temperatureCValue = dht.readTemperature();// Read temperature as Celsius (the default)
humidityValue = dht.readHumidity();// Reading humidity
temperatureFValue = dht.readTemperature(true);// Read temperature as Fahrenheit (isFahrenheit = true)
}//readTemperature() end
void displayMyValue()
{
switch (unit) {
case 1:
titleV = 1;
unitV =1;
myValue1= temperatureFValue;
displayTemperature( 1 , true);
break;
case 2:
titleV = 2;
unitV =2;
myValue1= humidityValue;
displayTemperature( 1, false );
break;
case 3:
titleV = 0;
unitV =0;
myValue1= temperatureCValue;
displayTemperature( 1 , true);
titleV = 2;
unitV =2;
myValue2= humidityValue;
displayTemperature( 2, false );
break;
case 4:
titleV = 1;
unitV =1;
myValue1= temperatureFValue;
displayTemperature( 1 , true);
titleV = 2;
unitV =2;
myValue2= humidityValue;
displayTemperature( 2 , false);
break;
case 5:
titleV = 0;
unitV =0;
myValue1= temperatureCValue;
displayTemperature( 1, true);
titleV = 1;
unitV =1;
myValue2= temperatureFValue;
displayTemperature( 2 , true);
break;
default:
titleV = 0;
unitV =0;
myValue1= temperatureCValue;
displayTemperature(1, true);
break;
}
}//displayMyValue() end
/*
* isplayTemperature(uint8_t line, bool degree)
* Displays temperature on Core2 screen
* See video for details
* https://youtu.be/ZDZm_QOlCJo
*/
void displayTemperature(uint8_t line, bool degree)
{
uint8_t Y_lineTitle,Y_lineValue;
float valueToDisplay;
//M5.Lcd.fillScreen(backgroundColor);
M5.Lcd.setTextColor(temperatureTitleColor);
M5.Lcd.setTextSize(4);
if(line ==1){
Y_lineTitle =line1TitleY;
Y_lineValue =line1ValueY;
valueToDisplay=myValue1;
//M5.Lcd.fillRect(0, 0, 340, line2TitleY, backgroundColor);
M5.Lcd.fillScreen(backgroundColor);
}else{
//M5.Lcd.drawRect(0, line2TitleY, 340, 240-line2TitleY, background2Color);
M5.Lcd.fillRect(0, line2TitleY, 340, 240-line2TitleY, background2Color);
Y_lineTitle =line2TitleY;
Y_lineValue =line2ValueY;
valueToDisplay=myValue2;
}
M5.Lcd.setCursor(3,Y_lineTitle);
M5.Lcd.print(title[titleV]);
M5.Lcd.setTextColor(temperatureValueColor);
M5.Lcd.setTextSize(7);
M5.Lcd.setCursor(3,Y_lineValue);
M5.Lcd.printf("%.1f", valueToDisplay);
if(degree){
printDegree();//print degree symbol if needed
}
M5.Lcd.print(unitText[unitV]);
}
/*
* displayHumidity()
* displays humidity from DHT11 or DHT22 on Core 2
* written by Ahmad Shamshiri
* on April 21, 2021 in Ajax, Ontario, Canada
* www.Robjax.com
*/
void displayHumidity()
{
M5.Lcd.setTextColor(humidityTitleColor);
M5.Lcd.setTextSize(4);
M5.Lcd.setCursor(3,110);
M5.Lcd.print(title[2]); //humidity title
M5.Lcd.setTextColor(humidityValueColor);
M5.Lcd.setTextSize(7);
M5.Lcd.setCursor(3,150);
M5.Lcd.printf("%.1f", humidityValue);
M5.Lcd.print(unitText[2]);
}//displayHumidity() end
/*
* printDegree()
* prints degree symbol
* Written by Ahmad Shamshiri
* on April 2, 2021 at 23:53
* www.robojax.com
*/
void printDegree()
{
M5.Lcd.setTextSize(3);
M5.Lcd.print("o");
M5.Lcd.setTextSize(7);
M5.Lcd.setCursor(M5.Lcd.getCursorX()+15,M5.Lcd.getCursorY());
}//printDegree() end
/*
written by Ahmad Shamshiri for Robojax, Robojax.com
on April 21, 2021 in Ajax, Ontario, Canada
*/
void printOnSerial()
{
Serial.print(title[unit]);
Serial.print(" ");
Serial.print(myValue1);
Serial.print(unitText[unit]);
Serial.println();
}//printOnSerial() end