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Alejandro Guerrero 2026-09-27 17:21:39 +02:00
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97
libraries/DHT20/examples/DHT20/DHT20.ino Normal file
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//
// FILE: DHT20.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT;
uint8_t count = 0;
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire.begin();
DHT.begin(); // ESP32 default pins 21 22
delay(1000);
}
void loop()
{
if (millis() - DHT.lastRead() >= 1000)
{
// READ DATA
uint32_t start = micros();
int status = DHT.read();
uint32_t stop = micros();
if ((count % 10) == 0)
{
count = 0;
Serial.println();
Serial.println("Type\tHumidity (%)\tTemp (°C)\tTime (µs)\tStatus");
}
count++;
Serial.print("DHT20 \t");
// DISPLAY DATA, sensor has only one decimal.
Serial.print(DHT.getHumidity(), 1);
Serial.print("\t\t");
Serial.print(DHT.getTemperature(), 1);
Serial.print("\t\t");
Serial.print(stop - start);
Serial.print("\t\t");
switch (status)
{
case DHT20_OK:
Serial.print("OK");
break;
case DHT20_ERROR_CHECKSUM:
Serial.print("Checksum error");
break;
case DHT20_ERROR_CONNECT:
Serial.print("Connect error");
break;
case DHT20_MISSING_BYTES:
Serial.print("Missing bytes");
break;
case DHT20_ERROR_BYTES_ALL_ZERO:
Serial.print("All bytes read zero");
break;
case DHT20_ERROR_READ_TIMEOUT:
Serial.print("Read time out");
break;
case DHT20_ERROR_LASTREAD:
Serial.print("Error read too fast");
break;
default:
Serial.print("Unknown error");
break;
}
Serial.print("\n");
}
}
// -- END OF FILE --

17
libraries/DHT20/examples/DHT20/performance_0.1.2.txt Normal file
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...Arduino\libraries\DHT20\examples\DHT20\DHT20.ino
DHT20 LIBRARY VERSION: 0.1.2
IDE 1.8.19
Arduino UNO
Type Humidity (%) Temp (°C) Time (µs) Status
DHT20 70.8 21.4 86701 OK
DHT20 71.7 21.4 86702 OK
DHT20 69.2 21.4 86701 OK
DHT20 66.4 21.4 86702 OK
DHT20 64.4 21.4 86701 OK
DHT20 62.8 21.4 86701 OK
DHT20 61.7 21.4 86702 OK
DHT20 60.7 21.4 86701 OK
DHT20 60.1 21.4 86702 OK
DHT20 59.6 21.4 86702 OK

17
libraries/DHT20/examples/DHT20/performance_0.1.3.txt Normal file
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...Arduino\libraries\DHT20\examples\DHT20\DHT20.ino
DHT20 LIBRARY VERSION: 0.1.3
IDE 1.8.19
Arduino UNO
Type Humidity (%) Temp (°C) Time (µs) Status
DHT20 61.4 21.5 54684 OK
DHT20 61.4 21.5 54692 OK
DHT20 61.4 21.5 54692 OK
DHT20 61.4 21.5 54688 OK
DHT20 61.4 21.5 54704 OK
DHT20 61.4 21.5 54692 OK
DHT20 61.4 21.5 54692 OK
DHT20 61.4 21.5 46496 OK
DHT20 69.7 22.2 46492 OK
DHT20 79.9 22.3 54688 OK

18
libraries/DHT20/examples/DHT20/performance_0.1.4.txt Normal file
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...Arduino\libraries\DHT20\examples\DHT20\DHT20.ino
DHT20 LIBRARY VERSION: 0.1.4
IDE 1.8.19
Arduino UNO
Type Humidity (%) Temp (°C) Time (µs) Status
DHT20 56.6 21.7 44136 OK
DHT20 56.6 21.7 44136 OK
DHT20 56.7 21.7 44144 OK
DHT20 57.0 21.7 44140 OK
DHT20 57.4 21.7 44136 OK
DHT20 57.7 21.7 44140 OK
DHT20 58.1 21.7 44148 OK
DHT20 58.5 21.7 44140 OK
DHT20 58.7 21.7 44132 OK
DHT20 59.2 21.8 44140 OK

18
libraries/DHT20/examples/DHT20/performance_0.2.0.txt Normal file
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...Arduino\libraries\DHT20\examples\DHT20\DHT20.ino
DHT20 LIBRARY VERSION: 0.2.0
IDE 1.8.19
Arduino UNO
Type Humidity (%) Temp (°C) Time (µs) Status
DHT20 76.2 19.2 45964 OK
DHT20 76.1 19.2 45960 OK
DHT20 75.8 19.2 45956 OK
DHT20 75.6 19.2 45952 OK
DHT20 75.4 19.2 45972 OK
DHT20 75.2 19.2 45976 OK
DHT20 75.1 19.2 45964 OK
DHT20 74.9 19.2 45960 OK
DHT20 74.8 19.2 45956 OK
DHT20 74.6 19.2 45960 OK

104
libraries/DHT20/examples/DHT20_I2C_speed/DHT20_I2C_speed.ino Normal file
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//
// FILE: DHT20_I2C_speed.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
// NOTE datasheet states 400 KHz as maximum
#include "DHT20.h"
DHT20 DHT;
uint32_t start, stop;
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Serial.println("\nNOTE: datasheet states 400 KHz as maximum.\n");
Wire.begin();
DHT.begin(); // ESP32 default pins 21, 22
delay(2000);
for (uint32_t speed = 50000; speed < 850000; speed += 50000)
{
Wire.setClock(speed);
Serial.print(speed);
Serial.print("\t");
Serial.print(DHT.read()); // status
Serial.print("\t");
Serial.print(DHT.getHumidity(), 1);
Serial.print("\t");
Serial.print(DHT.getTemperature(), 1);
Serial.println();
delay(1000);
}
Serial.println();
for (uint32_t speed = 50000; speed < 850000; speed += 50000)
{
Wire.setClock(speed);
start = micros();
DHT.read();
stop = micros();
Serial.print(speed);
Serial.print("\t");
Serial.print(stop - start); // time
Serial.print("\t");
Serial.print(DHT.getHumidity(), 1);
Serial.print("\t");
Serial.print(DHT.getTemperature(), 1);
Serial.println();
delay(1000);
}
Serial.println();
for (uint32_t speed = 50000; speed < 850000; speed += 50000)
{
DHT.requestData();
while (DHT.isMeasuring());
Wire.setClock(speed);
start = micros();
DHT.readData();
stop = micros();
DHT.convert();
Serial.print(speed);
Serial.print("\t");
Serial.print(stop - start); // time
Serial.print("\t");
Serial.print(DHT.getHumidity(), 1);
Serial.print("\t");
Serial.print(DHT.getTemperature(), 1);
Serial.println();
delay(1000);
}
Serial.println("\ndone...");
}
void loop()
{
}
// -- END OF FILE --

61
libraries/DHT20/examples/DHT20_I2C_speed/performance_0.2.2.txt Normal file
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Board: UNO
IDE: 1.8.19
DHT20_I2C_speed.ino
DHT20 LIBRARY VERSION: 0.2.2
NOTE: datasheet states 400 KHz as maximum.
50000 0 48.7 17.3
100000 0 48.7 17.3
150000 0 48.7 17.3
200000 0 48.6 17.3
250000 0 48.6 17.3
300000 0 48.6 17.3
350000 0 48.6 17.3
400000 0 48.6 17.3
450000 0 48.6 17.3
500000 0 48.6 17.3
550000 0 48.6 17.3
600000 0 48.6 17.3
650000 0 48.6 17.3
700000 0 48.6 17.3
750000 0 48.6 17.3
800000 0 48.6 17.3
50000 46916 48.6 17.4
100000 44600 48.6 17.4
150000 44264 48.6 17.3
200000 43996 48.6 17.3
250000 44308 48.6 17.3
300000 43624 48.6 17.3
350000 44248 48.6 17.3
400000 44040 48.6 17.3
450000 43724 48.5 17.4
500000 43612 48.6 17.3
550000 43388 48.6 17.4
600000 43204 48.6 17.4
650000 44200 48.6 17.3
700000 44108 48.6 17.4
750000 43984 48.6 17.4
800000 43984 48.5 17.4
50000 1576 48.6 17.3
100000 836 48.6 17.4
150000 588 48.5 17.3
200000 472 48.6 17.4
250000 400 48.5 17.3
300000 336 48.6 17.4
350000 296 48.6 17.4
400000 284 48.6 17.3
450000 252 48.6 17.4
500000 244 48.6 17.3
550000 228 48.6 17.4
600000 216 48.6 17.3
650000 204 48.6 17.3
700000 200 48.5 17.4
750000 188 48.6 17.4
800000 188 48.6 17.4
done...

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libraries/DHT20/examples/DHT20_async/DHT20_async.ino Normal file
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//
// FILE: DHT20_async.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT;
uint32_t counter = 0;
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire.begin();
Wire.setClock(400000);
DHT.begin(); // ESP32 default 21, 22
delay(2000);
// start with initial request
Serial.println(DHT.requestData());
}
void loop()
{
uint32_t now = millis();
if (now - DHT.lastRead() > 1000)
{
DHT.readData();
DHT.convert();
Serial.print(DHT.getHumidity(), 1);
Serial.print(" %RH \t");
Serial.print(DHT.getTemperature(), 1);
Serial.print(" °C\t");
Serial.print(counter);
Serial.print("\n");
// new request
counter = 0;
DHT.requestData();
}
// other code here
counter++; // dummy counter to show async behaviour
}
// -- END OF FILE --

174
libraries/DHT20/examples/DHT20_lcd/DHT20_lcd.ino Normal file
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//
// FILE: DHT20_lcd.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT;
uint8_t count = 0;
uint32_t stop, start;
///////////////////////////////////////////////////////////////////////////
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
#define BL_OFF 0
#define BL_ON 1
/*
#define BACKLIGHT_PIN 7
#define En_pin 4
#define Rw_pin 5
#define Rs_pin 6
#define D4_pin 0
#define D5_pin 1
#define D6_pin 2
#define D7_pin 3
#define LED_OFF 0
#define LED_ON 1
*/
int displayAddress = 0x27;
// LCD object is created as a placeholder as the actual address is determined in setupDisplay()
// constructor needs an I2C address. Better solution would be a function to set the address
// runtime in the class.
LiquidCrystal_I2C lcd(displayAddress);
void setupDisplay()
{
lcd = LiquidCrystal_I2C(displayAddress, En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin);
lcd.begin(20, 4);
// lcd.setBacklightPin(BACKLIGHT_PIN, NEGATIVE);
lcd.setBacklightPin(BACKLIGHT_PIN, POSITIVE);
lcd.setBacklight(BL_ON);
}
void display()
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("TEMP:");
lcd.setCursor(6, 0);
lcd.print(DHT.getTemperature());
lcd.setCursor(0, 1);
lcd.print("HUM:");
lcd.setCursor(6, 1);
lcd.print(DHT.getHumidity());
lcd.setCursor(0, 3);
lcd.print("TIME:");
lcd.setCursor(6, 3);
lcd.print(stop - start);
}
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire.begin();
DHT.begin(); // ESP32 default pins 21 22
setupDisplay();
delay(1000);
}
void loop()
{
if (millis() - DHT.lastRead() >= 1000)
{
// READ DATA
start = micros();
int status = DHT.read();
stop = micros();
display();
if ((count % 10) == 0)
{
count = 0;
Serial.println();
Serial.println("Type\tHumidity (%)\tTemp (°C)\tTime (µs)\tStatus");
}
count++;
Serial.print("DHT20 \t");
// DISPLAY DATA, sensor has only one decimal.
Serial.print(DHT.getHumidity(), 1);
Serial.print("\t\t");
Serial.print(DHT.getTemperature(), 1);
Serial.print("\t\t");
Serial.print(stop - start);
Serial.print("\t\t");
switch (status)
{
case DHT20_OK:
Serial.print("OK");
break;
case DHT20_ERROR_CHECKSUM:
Serial.print("Checksum error");
break;
case DHT20_ERROR_CONNECT:
Serial.print("Connect error");
break;
case DHT20_MISSING_BYTES:
Serial.print("Missing bytes");
break;
case DHT20_ERROR_BYTES_ALL_ZERO:
Serial.print("All bytes read zero");
break;
case DHT20_ERROR_READ_TIMEOUT:
Serial.print("Read time out");
break;
case DHT20_ERROR_LASTREAD:
Serial.print("Error read too fast");
break;
default:
Serial.print("Unknown error");
break;
}
Serial.print("\n");
}
}
// -- END OF FILE --

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libraries/DHT20/examples/DHT20_offset/DHT20_offset.ino Normal file
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//
// FILE: DHT20_offset.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT;
uint8_t count = 0;
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire.begin();
Wire.setClock(400000);
DHT.begin(); // ESP32 default pins 21 22
delay(1000);
}
void loop()
{
// set an offset after 10 seconds.
if (millis() > 10000)
{
DHT.setTempOffset(1.7);
DHT.setHumOffset(-2.3);
}
// make a measurement every 2 seconds
if (millis() - DHT.lastRead() >= 2000)
{
// READ DATA
uint32_t start = micros();
int status = DHT.read();
uint32_t stop = micros();
if ((count % 10) == 0)
{
count = 0;
Serial.println();
Serial.println("Type\tHumidity (%)\tTemp (°C)\tTime (µs)\tStatus\tOffset");
}
count++;
Serial.print("DHT20 \t");
// DISPLAY DATA, sensor has only one decimal.
Serial.print(DHT.getHumidity(), 1);
Serial.print("\t\t");
Serial.print(DHT.getTemperature(), 1);
Serial.print("\t\t");
Serial.print(stop - start);
Serial.print("\t\t");
switch (status)
{
case DHT20_OK:
Serial.print("OK");
break;
case DHT20_ERROR_CHECKSUM:
Serial.print("Checksum error");
break;
case DHT20_ERROR_CONNECT:
Serial.print("Connect error");
break;
case DHT20_MISSING_BYTES:
Serial.print("Missing bytes");
break;
case DHT20_ERROR_BYTES_ALL_ZERO:
Serial.print("All bytes read zero");
break;
case DHT20_ERROR_READ_TIMEOUT:
Serial.print("Read time out");
break;
case DHT20_ERROR_LASTREAD:
Serial.print("Error read too fast");
break;
default:
Serial.print("Unknown error");
break;
}
Serial.print("\t");
Serial.print(DHT.getHumOffset());
Serial.print("\t");
Serial.print(DHT.getTempOffset());
Serial.print("\n");
}
}
// -- END OF FILE --

45
libraries/DHT20/examples/DHT20_plotter/DHT20_plotter.ino Normal file
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//
// FILE: DHT20_plotter.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT(&Wire);
void setup()
{
Wire.begin();
DHT.begin(); // ESP32 default pins 21 22
Serial.begin(115200);
Serial.println("Humidity, Temperature");
}
void loop()
{
if (millis() - DHT.lastRead() >= 1000)
{
// note no error checking
DHT.read();
Serial.print(DHT.getHumidity(), 1);
Serial.print(", ");
Serial.println(DHT.getTemperature(), 1);
}
}
// -- END OF FILE --

49
libraries/DHT20/examples/DHT20_read_status/DHT20_read_status.ino Normal file
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//
// FILE: DHT20_read_status.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT;
uint8_t count = 0;
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire.begin();
Wire.setClock(400000);
DHT.begin(); // ESP32 default pins 21 22
delay(2000);
}
void loop()
{
int status = DHT.readStatus();
Serial.println(status);
delay(1000);
}
// -- END OF FILE --

80
libraries/DHT20/examples/DHT20_test_esp/DHT20_test_esp.ino Normal file
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//
// FILE: DHT20_test_esp.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT(&Wire1); // 2nd I2C interface
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire1.begin(12, 13); // select your pin numbers here
delay(2000);
Serial.println("Type,\tStatus,\tHumidity (%),\tTemperature (C)");
}
void loop()
{
// READ DATA
Serial.print("DHT20, \t");
int status = DHT.read();
switch (status)
{
case DHT20_OK:
Serial.print("OK,\t");
break;
case DHT20_ERROR_CHECKSUM:
Serial.print("Checksum error,\t");
break;
case DHT20_ERROR_CONNECT:
Serial.print("Connect error,\t");
break;
case DHT20_MISSING_BYTES:
Serial.print("Missing bytes,\t");
break;
case DHT20_ERROR_BYTES_ALL_ZERO:
Serial.print("All bytes read zero");
break;
case DHT20_ERROR_READ_TIMEOUT:
Serial.print("Read time out");
break;
case DHT20_ERROR_LASTREAD:
Serial.print("Error read too fast");
break;
default:
Serial.print("Unknown error,\t");
break;
}
// DISPLAY DATA, sensor has only one decimal.
Serial.print(DHT.getHumidity(), 1);
Serial.print(",\t");
Serial.println(DHT.getTemperature(), 1);
delay(2000);
}
// -- END OF FILE --

82
libraries/DHT20/examples/DHT20_test_rp2040/DHT20_test_rp2040.ino Normal file
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//
// FILE: DHT20_test_rp2040.ino
// AUTHOR: Rob Tillaart
// PURPOSE: Demo for DHT20 I2C humidity & temperature sensor
// URL: https://github.com/RobTillaart/DHT20
//
// Always check datasheet - front view
//
// +--------------+
// VDD ----| 1 |
// SDA ----| 2 DHT20 |
// GND ----| 3 |
// SCL ----| 4 |
// +--------------+
#include "DHT20.h"
DHT20 DHT(&Wire); // or use 2nd I2C interface &Wire1
void setup()
{
Serial.begin(115200);
Serial.println(__FILE__);
Serial.print("DHT20 LIBRARY VERSION: ");
Serial.println(DHT20_LIB_VERSION);
Serial.println();
Wire1.setSDA(12); // select your pin numbers here
Wire1.setSCL(13); // select your pin numbers here
Wire1.begin();
delay(2000);
Serial.println("Type,\tStatus,\tHumidity (%),\tTemperature (C)");
}
void loop()
{
// READ DATA
Serial.print("DHT20, \t");
int status = DHT.read();
switch (status)
{
case DHT20_OK:
Serial.print("OK,\t");
break;
case DHT20_ERROR_CHECKSUM:
Serial.print("Checksum error,\t");
break;
case DHT20_ERROR_CONNECT:
Serial.print("Connect error,\t");
break;
case DHT20_MISSING_BYTES:
Serial.print("Missing bytes,\t");
break;
case DHT20_ERROR_BYTES_ALL_ZERO:
Serial.print("All bytes read zero");
break;
case DHT20_ERROR_READ_TIMEOUT:
Serial.print("Read time out");
break;
case DHT20_ERROR_LASTREAD:
Serial.print("Error read too fast");
break;
default:
Serial.print("Unknown error,\t");
break;
}
// DISPLAY DATA, sensor has only one decimal.
Serial.print(DHT.getHumidity(), 1);
Serial.print(",\t");
Serial.println(DHT.getTemperature(), 1);
delay(2000);
}
// -- END OF FILE --