Ho comperato delle nuove sonde umidità e temperatura AHT25.
Su Nano non ho problemi, uso la libreria AHTxx che comprende anche la serie AHT20 e che è prevista per il Core di Spencer Konde.
Solo che su Attiny85, quando carico l'esempio AHT20_Serial, mi da questo errore:
C:\MEGA\sketchbook\libraries\AHTxx-main\src\AHTxx.cpp: In member function 'bool AHTxx::begin(uint32_t, uint32_t)':
C:\MEGA\sketchbook\libraries\AHTxx-main\src\AHTxx.cpp:95:8: error: 'class TwoWire' has no member named 'setWireTimeout'
Wire.setWireTimeout(stretch, false); //experimental! default 25000usec, true=Wire hardware will be automatically reset on timeout
^~~~~~~~~~~~~~
exit status 1
Errore durante la compilazione per la scheda ATtiny85 (Micronucleus / DigiSpark).
Se invece rimetto Nano come Scheda, l'errore sparisce ed il programma funziona...
Il programma è questo:
/***************************************************************************************************/
/*
This is an Arduino example for Aosong ASAIR AHT10/AHT15/AHT20/AHT21/AHT25/AM2301B/AM2311B
Digital Humidity & Temperature Sensor
written by : enjoyneering
sourse code: https://github.com/enjoyneering/
Aosong ASAIR AHT1x/AHT2x features:
- AHT1x +1.8v..+3.6v, AHT2x +2.2v..+5.5v
- AHT1x 0.25uA..320uA, AHT2x 0.25uA..980uA
- temperature range -40C..+85C
- humidity range 0%..100%
- typical accuracy T +-0.3C, RH +-2%
- typical resolution T 0.01C, RH 0.024%
- normal operating range T -20C..+60C, RH 10%..80%
- maximum operating rage T -40C..+80C, RH 0%..100%
- response time 8..30sec*
- I2C bus speed 100KHz..400KHz, 10KHz recommended minimum
*measurement with high frequency leads to heating
of the sensor, must be > 2 seconds apart to keep
self-heating below 0.1C
This device uses I2C bus to communicate, specials pins are required to interface
Board: SDA SCL Level
Uno, Mini, Pro, ATmega168, ATmega328..... A4 A5 5v
Mega2560................................. 20 21 5v
Due, SAM3X8E............................. 20 21 3.3v
Leonardo, Micro, ATmega32U4.............. 2 3 5v
Digistump, Trinket, ATtiny85............. PB0 PB2 5v
Blue Pill, STM32F103xxxx boards.......... PB9/PB7* PB8/PB6* 3.3v/5v
ESP8266 ESP-01........................... GPIO0** GPIO2** 3.3v/5v
NodeMCU 1.0, WeMos D1 Mini............... GPIO4/D2 GPIO5/D1 3.3v/5v
ESP32.................................... GPIO21/D21 GPIO22/D22 3.3v
*hardware I2C Wire mapped to Wire1 in stm32duino
see https://github.com/stm32duino/wiki/wiki/API#i2c
**most boards has 10K..12K pullup-up resistor
on GPIO0/D3, GPIO2/D4/LED & pullup-down on
GPIO15/D8 for flash & boot
Frameworks & Libraries:
ATtiny Core - https://github.com/SpenceKonde/ATTinyCore
ESP32 Core - https://github.com/espressif/arduino-esp32
ESP8266 Core - https://github.com/esp8266/Arduino
STM32 Core - https://github.com/stm32duino/Arduino_Core_STM32
GNU GPL license, all text above must be included in any redistribution,
see link for details - https://www.gnu.org/licenses/licenses.html
*/
/***************************************************************************************************/
#include <Wire.h>
#include <AHTxx.h>
#if defined(ESP8266)
#include <ESP8266WiFi.h>
#endif
float ahtValue; //to store T/RH result
AHTxx aht20(AHTXX_ADDRESS_X38, AHT2x_SENSOR); //sensor address, sensor type
/**************************************************************************/
/*
setup()
Main setup
*/
/**************************************************************************/
void setup()
{
#if defined(ESP8266)
WiFi.persistent(false); //disable saving wifi config into SDK flash area
WiFi.forceSleepBegin(); //disable AP & station by calling "WiFi.mode(WIFI_OFF)" & put modem to sleep
#endif
Serial.begin(115200);
Serial.println();
while (aht20.begin() != true) //for ESP-01 use aht20.begin(0, 2);
{
Serial.println(F("AHT2x not connected or fail to load calibration coefficient")); //(F()) save string to flash & keeps dynamic memory free
delay(5000);
}
Serial.println(F("AHT20 OK"));
//Wire.setClock(400000); //experimental I2C speed! 400KHz, default 100KHz
}
/**************************************************************************/
/*
loop()
Main loop
*/
/**************************************************************************/
void loop()
{
/* DEMO - 1, every temperature or humidity call will read 6-bytes over I2C, total 12-bytes */
Serial.println();
Serial.println(F("DEMO 1: read 12-bytes"));
ahtValue = aht20.readTemperature(); //read 6-bytes via I2C, takes 80 milliseconds
Serial.print(F("Temperature...: "));
if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
{
Serial.print(ahtValue);
Serial.println(F(" +-0.3C"));
}
else
{
printStatus(); //print temperature command status
if (aht20.softReset() == true) Serial.println(F("reset success")); //as the last chance to make it alive
else Serial.println(F("reset failed"));
}
delay(2000); //measurement with high frequency leads to heating of the sensor, see NOTE
ahtValue = aht20.readHumidity(); //read another 6-bytes via I2C, takes 80 milliseconds
Serial.print(F("Humidity......: "));
if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
{
Serial.print(ahtValue);
Serial.println(F(" +-2%"));
}
else
{
printStatus(); //print humidity command status
}
delay(2000); //measurement with high frequency leads to heating of the sensor, see NOTE
/* DEMO - 2, temperature call will read 6-bytes via I2C, humidity will use same 6-bytes */
Serial.println();
Serial.println(F("DEMO 2: read 6-byte"));
ahtValue = aht20.readTemperature(); //read 6-bytes via I2C, takes 80 milliseconds
Serial.print(F("Temperature: "));
if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
{
Serial.print(ahtValue);
Serial.println(F(" +-0.3C"));
}
else
{
printStatus(); //print temperature command status
}
ahtValue = aht20.readHumidity(AHTXX_USE_READ_DATA); //use 6-bytes from temperature reading, takes zero milliseconds!!!
Serial.print(F("Humidity...: "));
if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
{
Serial.print(ahtValue);
Serial.println(F(" +-2%"));
}
else
{
printStatus(); //print temperature command status not humidity!!! RH measurement use same 6-bytes from T measurement
}
delay(10000); //recomended polling frequency 8sec..30sec
}
/**************************************************************************/
/*
printStatus()
Print last command status
*/
/**************************************************************************/
void printStatus()
{
switch (aht20.getStatus())
{
case AHTXX_NO_ERROR:
Serial.println(F("no error"));
break;
case AHTXX_BUSY_ERROR:
Serial.println(F("sensor busy, increase polling time"));
break;
case AHTXX_ACK_ERROR:
Serial.println(F("sensor didn't return ACK, not connected, broken, long wires (reduce speed), bus locked by slave (increase stretch limit)"));
break;
case AHTXX_DATA_ERROR:
Serial.println(F("received data smaller than expected, not connected, broken, long wires (reduce speed), bus locked by slave (increase stretch limit)"));
break;
case AHTXX_CRC8_ERROR:
Serial.println(F("computed CRC8 not match received CRC8, this feature supported only by AHT2x sensors"));
break;
default:
Serial.println(F("unknown status"));
break;
}
}
