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Alejandro Guerrero 2026-09-27 17:21:39 +02:00
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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...