I started with the all enviro_all_basic.py, not much of that left now. It was a good starting point though.
I tweaked the descriptors and added color coding based on the values of what they were describing.
It’s plugged into Pimoroni Pico Lipo 16mb, thus the Battery % display.
When on USB Power it displays “Charging”
Pressing B turns the backlight of and leaves it running in the background.
Pressing A turns the backlight back on.
Pressing X resets the min Max temperature.
Next mod is to setup auto backlight based on background light level.
import time
from machine import ADC, Pin
from picographics import PicoGraphics, DISPLAY_ENVIRO_PLUS
from pimoroni import RGBLED, Button
from breakout_bme68x import BreakoutBME68X, STATUS_HEATER_STABLE
from pimoroni_i2c import PimoroniI2C
from breakout_ltr559 import BreakoutLTR559
display = PicoGraphics(display=DISPLAY_ENVIRO_PLUS, rotate=90)
display.set_font("bitmap8")
WIDTH, HEIGHT = display.get_bounds()
BRIGHTNESS = 0.8
led = RGBLED(6, 7, 10, invert=True)
button_a = Button(12, invert=True)
button_b = Button(13, invert=True)
button_x = Button(14, invert=True)
button_y = Button(15, invert=True)
PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
vsys = ADC(29)
charging = Pin(24, Pin.IN)
conversion_factor = 3 * 3.3 / 65535
full_battery = 4.2
empty_battery = 2.8
bme = BreakoutBME68X(i2c, address=0x77)
ltr = BreakoutLTR559(i2c)
t_color = display.create_pen(0,255,0)
h_color = display.create_pen(0,255,0)
p_color = display.create_pen(0,255,0)
l_color = display.create_pen(0,255,0)
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)
grey = display.create_pen(120,120,120)
violet = display.create_pen(255,0,255)
cyan = display.create_pen(0,255,255)
magenta = display.create_pen(200, 0, 200)
def describe_temperature(temperature):
global t_color
if temperature < -10:
description = "Very Cold"
t_color = white
elif -10 <= temperature <= 0:
description = "Cold"
t_color = blue
elif 0 < temperature <= 12:
description = "Cool"
t_color = yellow
elif 12 < temperature <= 16:
description = "OK"
t_color = green
elif 16 < temperature <= 24:
description = "Warm"
t_color = green
elif 24 < temperature <= 27:
description = "Hot"
t_color = orange
elif temperature > 27:
description = "Very Hot"
t_color = red
return description
def describe_humidity(humidity):
global h_color
if humidity < 30:
description = "Low"
h_color = red
elif 30 <= humidity <= 60:
description = "OK"
h_color = green
elif 60 < humidity < 80:
description = "High"
h_color = yellow
elif humidity >= 80:
description = "Very High"
h_color = orange
return description
def describe_pressure(pressure):
global p_color
if pressure < 982:
description = "Very Low"
p_color = red
elif 982 <= pressure < 1004:
description = "Low"
p_color = yellow
elif 1004 <= pressure < 1026:
description = "OK"
p_color = green
elif 1026 <= pressure < 1048:
description = "High"
p_color = blue
elif pressure >= 1048:
description = "Very High"
p_color = orange
return description
def describe_light(lux):
#lux += 0.5
global l_color
if lux < 50:
description = "Dark"
l_color = magenta
elif 50 <= lux < 100:
description = "Dim"
l_color = cyan
elif 100 <= lux < 500:
description = "Light"
l_color = yellow
elif lux >= 500:
description = "Bright"
l_color = white
return description
min_temperature = 100.0
max_temperature = 0.0
led.set_rgb(0, 0, 0)
display.set_backlight(BRIGHTNESS)
display.set_pen(black)
display.update()
# the gas sensor gives a few weird readings to start, lets discard them
temperature, pressure, humidity, gas, status, _, _ = bme.read()
time.sleep(0.5)
temperature, pressure, humidity, gas, status, _, _ = bme.read()
time.sleep(0.5)
while True:
voltage = vsys.read_u16() * conversion_factor
percentage = 100 * ((voltage - empty_battery) / (full_battery - empty_battery))
if percentage > 100:
percentage = 100
if button_a.is_pressed:
display.set_backlight(BRIGHTNESS)
time.sleep(0.2)
elif button_b.is_pressed:
display.set_backlight(0)
time.sleep(0.2)
elif button_x.is_pressed:
min_temperature = 100.0
max_temperature = 0.0
display.set_backlight(BRIGHTNESS)
time.sleep(0.2)
elif button_y.is_pressed:
display.set_backlight(BRIGHTNESS)
time.sleep(0.2)
temperature, pressure, humidity, gas, status, _, _ = bme.read()
heater = "Stable" if status & STATUS_HEATER_STABLE else "Unstable"
temperature = round(temperature)
if temperature >= max_temperature:
max_temperature = temperature
if temperature <= min_temperature:
min_temperature = temperature
pressure = pressure / 100
pressure = round(pressure)
ltr_reading = ltr.get_reading()
lux = ltr_reading[BreakoutLTR559.LUX]
prox = ltr_reading[BreakoutLTR559.PROXIMITY]
if heater == "Stable" and ltr_reading is not None:
led.set_rgb(0, 0, 0)
display.set_pen(black)
display.clear()
display.set_pen(white)
display.text(f"{temperature:.0f}°C", 0, 0, WIDTH, scale=4)
describe_temperature(temperature)
display.set_pen(t_color)
display.text(describe_temperature(temperature), 90, 0, WIDTH, scale=4)
display.set_pen(cyan)
display.text(f"Min {min_temperature:.0f}", 0, 35, WIDTH, scale=3)
display.set_pen(cyan)
display.text(f"Max {max_temperature:.0f}", 125, 35, WIDTH, scale=3)
display.set_pen(white)
display.text(f"{humidity:.0f}% RH", 0, 75, WIDTH, scale=4)
display.text(f"{pressure:.0f}mb", 0, 120, WIDTH, scale=4)
display.text("Light", 0, 165, WIDTH, scale=4)
#display.text(f"{lux:.0f} lux", 0, 180, WIDTH, scale=4)
describe_humidity(humidity)
display.set_pen(h_color)
display.text(f"{describe_humidity(humidity)}", 125, 81, WIDTH, scale=3)
display.set_pen(p_color)
describe_pressure(pressure)
display.text(f"{describe_pressure(pressure)}", 125, 126, WIDTH, scale=3)
describe_light(lux)
display.set_pen(l_color)
display.text(f"{describe_light(lux)}", 125, 171, WIDTH, scale=3)
display.set_pen(blue)
if charging.value() == 1: # if it's plugged into USB power...
display.text("Charging", 50, 210, WIDTH, scale=4)
else:
if percentage >= 50:
display.set_pen(green)
display.text("Battery", 0, 210, WIDTH, scale=4)
display.text('{:.0f}%'.format(percentage), 155, 210, WIDTH, scale=4)
elif 50 > percentage > 20:
display.set_pen(yellow)
display.text("Battery", 0, 220, WIDTH, scale=3)
display.text('{:.0f}%'.format(percentage), 155, 220, WIDTH, scale=3)
elif percentage <= 20:
display.set_pen(red)
display.text("Battery", 0, 220, WIDTH, scale=3)
display.text('{:.0f}%'.format(percentage), 155, 220, WIDTH, scale=3)
display.update()
time.sleep(0.5)