BarometricSensor

Introduction

The ESP module can read a BMP085 temperature/Barometric pressure sensor using the I2C protocol.

The DHT sensor needs to be connected to a the I2C pins on the ESP module. These pins can be configured on the hardware tab.

Hardware

The BMP085 sensor can be connected directly to an ESP module by using the two pins SDA and SCL.

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Use 3.3V break boards only. Sometimes, it could be necessary to add a 100nF ceramic capacitor across the power terminals of the BMP085/180

Design considerations

The standard pins for I2C are Do not use GPIO015 as an input for the DHT11/22. During startup of the ESP8266, this pin must be Low for proper operation. It is better to avoid using GPIO00 as an input as well. This pin must be High at startup, unless program mode is required. The data pin of the DHT11/22 needs a pull-up resistor. A value of 4k7 - 10k proves to be sufficient.

Software

ESP Easy

The BMP085/180 communicates with the ESP8266 through the I2C interface, so first use the Hardware tab in the web interface of ESP Easy to find out what pins are being used for SDA and SDC. They can be altered if required.

Next use the device tab on the ESP Easy webinterface and create a new task by editing one of the available tasks. Select "BMP085 Barometric Sensor" from the dropdown box.

Enter the IDX found in the Domoticz device page. That should be all.

Optional settings

Use of formulas

Use of value names

ESP Connexio

Syntax: BMP085Read "var"