explorer.py

# This example lets you plug a BME680 or BME688 breakout into your Pico Explorer to make a little indoor weather station, with barometer style descriptions.

import time
from breakout_bme68x import BreakoutBME68X
from pimoroni_i2c import PimoroniI2C
from pimoroni import PICO_EXPLORER_I2C_PINS
from picographics import PicoGraphics, DISPLAY_PICO_EXPLORER

# set up the hardware
display = PicoGraphics(display=DISPLAY_PICO_EXPLORER)
i2c = PimoroniI2C(**PICO_EXPLORER_I2C_PINS)
bme = BreakoutBME68X(i2c, address=0x76)

# lets set up some pen colours to make drawing easier
TEMPCOLOUR = display.create_pen(0, 0, 0)  # this colour will get changed in a bit
WHITE = display.create_pen(255, 255, 255)
BLACK = display.create_pen(0, 0, 0)
RED = display.create_pen(255, 0, 0)
GREY = display.create_pen(125, 125, 125)


# converts the temperature into a barometer-type description and pen colour
def describe_temperature(temperature):
    global TEMPCOLOUR
    if temperature < 10:
        description = "very cold"
        TEMPCOLOUR = display.create_pen(0, 255, 255)
    elif 10 <= temperature < 20:
        description = "cold"
        TEMPCOLOUR = display.create_pen(0, 0, 255)
    elif 20 <= temperature < 25:
        description = "temperate"
        TEMPCOLOUR = display.create_pen(0, 255, 0)
    elif 25 <= temperature < 30:
        description = "warm"
        TEMPCOLOUR = display.create_pen(255, 255, 0)
    elif temperature >= 30:
        description = "very warm"
        TEMPCOLOUR = display.create_pen(255, 0, 0)
    else:
        description = ""
        TEMPCOLOUR = display.create_pen(0, 0, 0)
    return description


# comment out the function above and uncomment this one for yorkshire mode
"""
def describe_temperature(temperature):
    global TEMPCOLOUR
    if temperature < 10:
        description = "frozzed"
        TEMPCOLOUR = display.create_pen(0, 255, 255)
    elif 10 <= temperature < 20:
        description = "nithering"
        TEMPCOLOUR = display.create_pen(0, 0, 255)
    elif 20 <= temperature < 25:
        description = "fair t' middlin"
        TEMPCOLOUR = display.create_pen(0, 255, 0)
    elif 25 <= temperature < 30:
        description = "chuffing warm"
        TEMPCOLOUR = display.create_pen(255, 255, 0)
    elif temperature >= 30:
        description = "crackin t' flags"
        TEMPCOLOUR = display.create_pen(255, 0, 0)
    else:
        description = ""
        TEMPCOLOUR = display.create_pen(0, 0, 0)
    return description
"""


# converts pressure into barometer-type description
def describe_pressure(pressure):
    if pressure < 970:
        description = "storm"
    elif 970 <= pressure < 990:
        description = "rain"
    elif 990 <= pressure < 1010:
        description = "change"
    elif 1010 <= pressure < 1030:
        description = "fair"
    elif pressure >= 1030:
        description = "dry"
    else:
        description = ""
    return description


# converts humidity into good/bad description
def describe_humidity(humidity):
    if 40 < humidity < 60:
        description = "good"
    else:
        description = "bad"
    return description


while True:
    display.set_pen(BLACK)
    display.clear()

    # read the sensors
    temperature, pressure, humidity, gas_resistance, status, gas_index, meas_index = bme.read()

    # pressure comes in pascals which is a reight long number, lets convert it to the more manageable hPa
    pressurehpa = pressure / 100

    # draw a thermometer/barometer thingy
    display.set_pen(GREY)
    display.circle(190, 190, 40)
    display.rectangle(180, 45, 20, 140)

    # switch to red to draw the 'mercury'
    display.set_pen(RED)
    display.circle(190, 190, 30)
    thermometerheight = int(120 / 30 * temperature)
    if thermometerheight > 120:
        thermometerheight = 120
    if thermometerheight < 1:
        thermometerheight = 1
    display.rectangle(186, 50 + 120 - thermometerheight, 10, thermometerheight)

    # drawing the temperature text
    display.set_pen(WHITE)
    display.text("temperature:", 10, 10, 240, 3)
    display.set_pen(TEMPCOLOUR)
    display.text('{:.1f}'.format(temperature) + 'C', 10, 30, 240, 5)
    display.set_pen(WHITE)
    display.text(describe_temperature(temperature), 10, 60, 240, 3)

    # and the pressure text
    display.text("pressure:", 10, 90, 240, 3)
    display.text('{:.0f}'.format(pressurehpa) + 'hPa', 10, 110, 240, 5)
    display.text(describe_pressure(pressurehpa), 10, 140, 240, 3)

    # and the humidity text
    display.text("humidity:", 10, 170, 240, 3)
    display.text('{:.0f}'.format(humidity) + '%', 10, 190, 240, 5)
    display.text(describe_humidity(humidity), 10, 220, 240, 3)

    # time to update the display
    display.update()

    # waits for 1 second and clears to BLACK
    time.sleep(1)