MicroPython envirobit:bit library for the BBC micro:bit

Installing

enviro:bit consists of:

• a tcs3472 colour sensor,
• a bme280 temperature, pressure and humidity sensor
• a mems microphone

Files are supplied for each of these features, and you can pick and choose what to use in your project.

Copy the driver files from you need from the library/ folder into your "mu_code" folder, this might be in:

• C:\Users\YourUserName\mu_code on Windows
• /Users/YourUserName/mu_code on macOS

Create a new blank file in Mu for your project, leave it blank and Flash it to your micro:bit with the Flash button. You can close this for now.

Create another new file, save this one as "main.py" and keep it open.

Now open the "Files" dialog (you might have to close the "Repl" first) and drag and drop main.py and the driver .py files from the right pane, to the left pane.

When you reset your micro:bit, it will load main.py- so you can "import" the libraries and start writing your code here!

Function Reference

bme280

For temperature, pressure and humidity readings you must use the bme280 driver. First initialise it like so:

import bme280
bme = bme280.bme280

Your class instance, bme, will now have the following methods:

• bme.temperature() - return the temperature in degrees C
• bme.pressure() - return the pressure in hectopascals
• bme.humidity() - return the relative humidity in %
• bme.altitude() - return the altitude in feet, calculated against the current QNH value
• bme.set_qnh(value) - set the QNH value for calculating altitude

sound

For sound readings you must use the sound driver. First initialise it like so:

import sound
sound = sound.sound()

Your class instance, sound, will now have the following methods:

• sound.read() - take a reading of the sound level which you can use to compare different sound levels
• sound.wait_for_double_clap() - listen for a high sound level twice in a second, returns True if detected
• sound.wait_for_clap() - listen for a high sound level once in a second, returns True if detected

tcs3472

For tcs3472 readings you must use the tcs3472 driver. First initialise it like so:

import tcs3472

light_sensor = tcs3472.tcs3472() 

Your class instance, light_sensor, will now have the following methods:

• light_sensor.rgb() - returns the corrected levels of red, green and blue out of 255
• light_sensor.scaled() - return the amounts of red, green and blue on a scale of 0-1
• light_sensor.light() - return a raw reading of light level on a scale of 0-65535
• light_sensor.set_leds() - turn the leds on and off with 0 or 1