It is a very simple project, ideal for beginners<\/strong>but which has been highly requested by regular readers of the blog, so here it is, in the hope that it will be useful for you too.<\/p>\n\n\n\n There are many temperature sensors, quite a few humidity sensors, some atmospheric pressure sensors, and fewer that combine all three and do all three. with a certain quality in their measurements<\/strong>. The BME280 is an example of the latter type.<\/p>\n\n\n\n Considering what it delivers, and how well it does it, the BME280 is a very economical and highly recommended sensor<\/strong> when we want to obtain these three environmental measures.<\/p>\n\n\n\n This is a project that allows us to obtain measurements, with a fairly high degree of precision, of ambient temperature, relative humidity, and atmospheric pressure<\/strong> and display them on a web page, make graphs, send them to any system by means of MQTT, HTTP and others<\/strong>.<\/p>\n\n\n\n The project consists of only two components:<\/p>\n\n\n\n On the firmware side, we will be using ESP Easy, which will allow us to do a whole host of things without the need for programming<\/strong>.<\/p>\n\n\n\n One of the advantages of ESP Easy (and my favourite<\/strong>is that it enables us to connect to our project many different accessories without having to program or complicate our lives.<\/strong> with firmware modifications or adaptations.<\/p>\n\n\n\n The BME280 sensor, as we are going to use it, comes on a tiny printed circuit board of less than one square centimetre.<\/p>\n\n\n\n This sensor allows temperature measurement in the range -40 to + 85 \u00b0C with an accuracy of \u00b11 \u00b0C and a resolution of 0.01 \u00b0C.<\/p>\n\n\n\n Its range as a barometer is 300hPa to 1110 hPa, equivalent to an altitude of -500m to 9000m above sea level (you can also use it as an altimeter). With an absolute accuracy of \u00b11.0C and 1.0 hPa, and relative pressure of 0.12 hPa, equivalent to an accuracy of approximately \u00b11m.<\/p>\n\n\n\n As a hygrometer, the BME280 has a relative humidity measurement range of 0 to 100%, with an accuracy of \u00b13% Pa and a resolution of 0.008%.<\/p>\n\n\n\n The sensor's very low power consumption of only 3.6 \u00b5A for measurements at 1Hz (once per second) means that the sensor can run for years and years on even a small battery. In deep sleep mode it consumes only 0.1 \u00b5A, which means that the sensor can run for years and years on even a small battery. could be powered for tens of years from a single button cell battery.<\/strong>.<\/p>\n\n\n\n The module can communicate via I2C<\/strong> (up to 3,4 MHz) or SPI <\/strong>(up to 10 MHz), making it very easy to connect to a microprocessor such as the ESP8266, ESP32, Arduino and others.<\/p>\n\n\n\n In our case, we are going to communicate with it via I2C, which has the additional advantage of using only two pins of the ESP8266<\/strong> (which we can also use at the same time to communicate with other I2C devices, all of which can be used to communicate with other I2C devices). connected in parallel<\/strong>), leaving many ESP8266 pins free for other uses.<\/p>\n\n\n\n The power supply voltage of the sensor is 1.8 to 3.6V, but is available in either 3.3V modules as well as 5V modules<\/strong>The power supply, such as the one we are going to use in this tutorial, already incorporates the necessary level matching. You could use a 3.3V power supply by simply connecting the power supply to the 3V3 pin of the NodeMCU or Wemos D1 Mini.<\/p>\n\n\n\n There is a physically identical sensor, called the BMP280, which does not include atmospheric pressure measurement in exchange for being cheaper.<\/p>\n\n\n\n These are the main characteristics<\/strong> of the BME280 sensor:<\/p>\n\n\n\nWhat the project consists of<\/h2>\n\n\n\n
The BME280 sensor<\/h2>\n\n\n\n
![\"\"](\"https:\/\/emariete.com\/wp-content\/uploads\/2021\/01\/BME280.png\")
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