Code:
'''
Weather Display
Pico + Lipo Shim
Pico Display Pack V1
BME280 Breakout - Temperature, Pressure, Humidity Sensor
'''
import machine
import utime
import gc
from machine import ADC, Pin
from breakout_bme280 import BreakoutBME280
from pimoroni_i2c import PimoroniI2C
# Pico Display boilerplate
import picodisplay as display # Comment this line out to use PicoDisplay2
# import picodisplay2 as display # Uncomment this line to use PicoDisplay2
width = display.get_width()
height = display.get_height()
gc.collect()
display_buffer = bytearray(width * height * 2)
display.init(display_buffer)
display.set_backlight(0.5)
PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
bme = BreakoutBME280(i2c)
vsys = ADC(29) # reads the system input voltage
charging = Pin(24, Pin.IN) # reading GP24 tells us whether or not USB power is connected
conversion_factor = 3 * 3.3 / 65535
full_battery = 4.2 # these are our reference voltages for a full/empty battery, in volts
empty_battery = 2.8 # the values could vary by battery size/manufacturer so you might need to adjust them
# lets set up some pen colors to make drawing easier
tempcolor = display.create_pen(0, 255, 0) # this colour will get changed in a bit
humidcolor = display.create_pen(0, 255, 0) # this colour will get changed in a bit
presscolor = display.create_pen(0, 255, 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)
green = display.create_pen(0, 255, 0)
blue = display.create_pen(0, 0, 255)
yellow = display.create_pen(255, 255, 0)
orange = display.create_pen(255, 140, 0)
# converts the temperature into a description and pen colour
def describe_temperature(temperature):
global tempcolor
if temperature < 0:
description = "very cold"
tempcolor = blue
elif 0 <= temperature < 12:
description = "cold"
tempcolor = yellow
elif 12 <= temperature < 17:
description = "cool"
tempcolor = green
elif 17 <= temperature < 25:
description = "warm"
tempcolor = green
elif 25 <= temperature < 30:
description = "hot"
tempcolor = orange
elif temperature >= 30:
description = "very hot"
tempcolor = red
else:
description = ""
tempcolor = black
return description
min_temp = None
max_temp = None
# converts humidity into good/bad description and pen color
def describe_humidity(humidity):
global humidcolor
if humidity < 30:
description = "low dry"
humidcolor = orange
elif 30 <= humidity < 61:
description = "ok"
humidcolor = green
elif 61 <= humidity < 81:
description = "high"
humidcolor = yellow
elif humidity >= 81:
description = "very high"
humidcolor = red
else:
description = ""
humidcolor = black
return description
# converts pressure into barometer-type description and pen color
def describe_pressure(pressure):
global presscolor
if pressure < 982:
description = "very low"
presscolor = red
elif 982 <= pressure < 1004:
description = "low"
presscolor = yellow
elif 1004 <= pressure < 1026:
description = "unsettled"
presscolor = green
elif 1026 <= pressure < 1048:
description = "high"
presscolor = blue
elif pressure >= 1048:
description = "very high"
presscolor = orange
else:
description = ""
presscolor = black
return description
start_time = utime.time()
while True:
# fills the screen with black
display.set_pen(0, 0, 0)
display.clear()
time_elapsed = utime.time() - start_time
# read the sensors
temperature, pressure, humidity = bme.read()
# convert pressure to mb
pressuremb = pressure / 100
#240x135 pixel IPS display
# draw the temperature reading
display.set_pen(tempcolor)
display.text('{:.1f}'.format(temperature) + '`c', 10, 10, 240, 3)
display.set_pen(white)
display.text(describe_temperature(temperature), 10, 30, 240, 3)
# and the humidity reading
display.set_pen(humidcolor)
display.text('{:.0f}'.format(int(humidity)) + '%', 10, 50, 240, 3)
display.set_pen(white)
display.text(describe_humidity(int(humidity)), 10, 70, 240, 3)
# drawing the pressure reading
display.set_pen(presscolor)
display.text('{:.0f}'.format(pressuremb) + 'mb', 10, 90, 240, 3)
display.set_pen(white)
display.text(describe_pressure(pressuremb), 10, 110, 240, 3)
voltage = vsys.read_u16() * conversion_factor
percentage = 100 * ((voltage - empty_battery) / (full_battery - empty_battery))
if percentage > 100:
percentage = 100.00
# adding text
display.set_pen(0, 255, 0)
if charging.value() == 1: # if it's plugged into USB power...
display.text("Charging!", 110, 10, 240, 3)
display.set_led(0,0,125)
else: # if not, display the battery stats
display.text("Battery!", 110, 10, 240, 3)
display.set_led(125,0,0)
display.text('{:.2f}'.format(voltage) + "v", 135, 30, 240, 3)
display.text('{:.0f}%'.format(percentage), 140, 50, 240, 3)
# time to update the display
display.update()
# waits for 1 second and clears to black
utime.sleep(1)
display.set_pen(black)
display.clear()
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