View source for Team14 barometric pressure sensor

= PIM472 BME280 Temperature, Pressure, & Humidity Sensor =
The BME280 is a sensor from Bosch used for measuring the temperature, air pressure and humidity. It is a nice environmental sensor for indoors or even outdoors in a suitable enclosure. The breakout board is compatible with 3.3 or 5 operating supply voltage and uses an I2C interface. This makes the sensor compatible for operating using any model of Raspberry Pi or Arduino microcontroller.
* '''Pressure:''' range of 300 to 1100 hPa, sensitivity error ±0.25%, RMS Noise 0.2Pa
* '''Temperature:''' range of -40 to 85°C 
* '''Humidity:''' accuracy tolerance ±3% relative humidity

== Technical Specifications ==
If you’re using a Raspberry Pi, you can solder the PIM472 onto the bottom left 5 pins on your Raspberry Pi's GPIO header (pins 1, 3, 5, 6, 9).

===Pinout===
* '''2-6V''' - Power supply, compatible with 3.3V and 5V
* '''SDA''' - Serial Data Input: I2C communication
* '''SCL''' - Serial Clock Input: I2C communication
* '''GND''' - Ground

== Advantages and Disadvantages ==

=== Advantages ===
* Three sensors in one
* Many uses for mobile applications and wearables: health monitoring (heat stroke and dehydration warning, lung volume ), weather forecast, indoor and outdoor navigation, control of heating, ventilation, air conditioning (HVAC) systems, sports and leisure
* I2C and SPI bus interface

=== Disadvantages ===
* Price (~16€) high if you don’t need all three sensor functions

= Getting the BME280 to work =

== Wiring with Wemos D1 Mini ==
* Connect 2-6V to power supply (3.3V or 5V) - we use 5V
* Connect SDA to any I2C data SDA pin - GPIO4 (D2)
* Connect SCL to any I2C data SCL pin - GPIO5 (D1)
* Connect GND to ground - G

== Required Library ==
* Download and save this code as '''[https://github.com/RuiSantosdotme/ESP-MicroPython/blob/master/code/WiFi/HTTP_Client_IFTTT_BME280/BME280.py BME280.py]''' 
* Upload the code to the microcontroller

== Code Example ==
<syntaxhighlight lang="python" line='line'>

# import modules
from time import sleep
from machine import Pin, I2C
import BME280

# Initialise the BME280
sda = Pin(4)
scl = Pin(5)
i2c = machine.I2C(sda=sda, scl=scl)
bme280 = BME280.BME280(i2c=i2c)

# Print out temperature, air pressure and humidity values
while True:
    temperature = bme280.temperature
    pressure = bme280.pressure
    humidity = bme280.humidity
    
    print('Temperature: ', temperature)
    print('Air pressure: ', pressure)
    print('Humidity: ', humidity)
    print("----------------------")

    sleep(2)


</syntaxhighlight>

== Instructional Video ==