ESP8266 Community Forum

- Thu Apr 16, 2015 7:50 am #14700 This library worked for me to control a SHT15
https://github.com/practicalarduino/SHT1x

- Thu Apr 16, 2015 8:32 am #14703

Now I get a new error:

Code: Select allundefined reference to `__ieee754_sqrt'

Is there a #include <math.h> in your code, or in the lib?

- Mon Apr 27, 2015 3:45 pm #15842 Got the bpm085 working on my esp-01.

Code: Select allHere is the code I added to the BMP085 library, it now compiles properly:

double powr(double a,double b){
return 1.0;
}

Note that the function name was changed from “pow” to “powr”.

And remember to change the function name in the library code. It occurs in two places.

Here:

int32_t Adafruit_BMP085::readSealevelPressure(float altitude_meters) {
float pressure = readPressure();
return (int32_t)(pressure / powpowr(1.0-altitude_meters/44330, 5.255));
}

And here:

float Adafruit_BMP085::readAltitude(float sealevelPressure) {
float altitude;
float pressure = readPressure();
altitude = 44330 * (1.0 – powpowr(pressure /sealevelPressure,0.1903));
return altitude;
}

Thanks to this article:
http://internetofhomethings.com/homethings/?p=359

Didn't found it out myself, so credits to the author of the site above. Hope it can help someone.

- Sun May 17, 2015 11:23 pm #17712 DHT11 and DHT22 complied and working, tested. Neither required a pullup resistor and have been working reliably for days. Library properties below:

Code: Select allname=DHT sensor library
version=1.0.0
author=Adafruit
maintainer=Adafruit <info@adafruit.com>
sentence=Arduino library for DHT11, DHT22, etc Temp & Humidity Sensors
paragraph=Arduino library for DHT11, DHT22, etc Temp & Humidity Sensors
category=Sensors
url=https://github.com/adafruit/DHT-sensor-library
architectures=*