Text
Changing The Font
Change the font:
display.set_font(font)
Bitmap fonts. These are aligned from their top-left corner.
bitmap6
bitmap8
bitmap14_outline
Vector (Hershey) fonts. These are aligned to their midline.
sans
gothic
cursive
serif_italic
serif
I can only get the bitmap fonts working.
Anyone got luck with the Vector fonts?
I tried
display.set_font(“gothic”)
display.set_font(gothic)
cheers
Thanks for the pointer, I think I’ve seen it before. Nice to revisit.
p.s. Just saw 1.19.2 out, will update and see. :-)
p.p.s. I use text edit in osx, I should really change to something else. tired of getting code switched.
My bme688 is getting 99405 for pressure and 95167 for gas resist.
When I covert that pressure number to psi I get around 1440psi (using web formula * 0.0145038).
That number doesn’t look right to me, I wonder what all your pressure number look like?
And I am digging out what that gas resist number represent… VOC? AOI?
I just divide it by 100 to get milibars, mb. 994mb would be a very low pressure. It’s 1010mb here as I type this. Something’s not right?
so I question my bme688 reading.
hmmm…
My mechanical “hangs on the wall” barometer goes from 960mb to 1070mb.
Right now It’s reading 1006mb and my BME280 is saying 1008mb.
I’m on a sea coast, about 100 or so feet above sea level.
Does your pressure reading change over time? Even a little bit? Keep in mind that any change will be small, and slow. A normal rate of change for mine is about 1 mb per hour if a low pressure system is moving in.
Here is my logic, tell me what you think of it.
According to some web source, (which looks good to me) mentioned:
1 hPa = 1mb, and
1hPa * 0.0145038 = 1 psi
therefore, I am convinced that your reading and mine from the read function returned are in fact hPa x 100. Yeap, 100 times hPa.
That’s why when you move two digit to the left get your mb reading, and I, am getting 1440 psi, which if I do the same gets me 14.4 psi, which sound about right.
So the pal in the picture is getting hPa from his (read function and sensor). And you and I are getting 100 * hPa from our (read function and sensor). I am not sure which one to pin (function or sensor), yet.
interesting
It outputs pressure in Pascals, Pa. 1 pa = 0.01 mb.
So 100800 Pa is 1008mb. That’s why I divide by 100. The local forecasts all use mb so I do too. It just happens that the math for me is easy.
I have noticed that on one of my BME280’s the very first pressure reading is very low. The next reading is accurate, and all after that are fine. Being fussy I put a 1 sec delay in before displaying any readings. I let it take readings, but don’t display any of them for a second. Here is part of the BME68X example
while True:
temperature, pressure, humidity, gas, status, _, _ = bmp.read()
heater = "Stable" if status & STATUS_HEATER_STABLE else "Unstable"
print("{:0.2f}c, {:0.2f}Pa, {:0.2f}%, {:0.2f} Ohms, Heater: {}".format(
temperature, pressure, humidity, gas, heater))
time.sleep(1.0)
P.g. 13 of the above data sheet, mentioned unit of pressure is hPa.
See, something isn’t right.
But I am glad we are working around it.
Below is what I got so far, sharing it here.
Will leave bme688 alone for now. Going to work on SCD41 next (or RV3028?).
I have yet to figure out why bme688_pressure_min is off, and still can’t get upload pic work for me.
Will post a pic of the screen when I can.
# universal
import utime
import jpegdec
# setup breakout garden base
from pimoroni_i2c import PimoroniI2C
PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
# setup 1.54” square breakout LCD
# https://github.com/pimoroni/pimoroni-pico/tree/main/micropython/modules/picographics#drawing-text
import picographics
from picographics import PicoGraphics, DISPLAY_LCD_240X240, PEN_RGB332
display = PicoGraphics(display=DISPLAY_LCD_240X240, rotate=0, pen_type=PEN_RGB332)
display.set_backlight(0.5)
# define colors
black = display.create_pen(000, 000, 000)
lightblue = display.create_pen(000, 236, 255)
green = display.create_pen(000, 255, 000)
red = display.create_pen(255, 000, 000)
grey = display.create_pen(120, 120, 120)
orange = display.create_pen(255, 140, 000)
violet = display.create_pen(255, 000, 255)
yellow = display.create_pen(255, 255, 000)
white = display.create_pen(255, 255, 255)
# BME688 Section start
# air quality: IAQ indoor air quality index, calculated by Bosch software BSEC library
# air temperature: -40 .. 85cel
# air pressure : 300 .. 1100hPa
# air humidity : 0 .. 100%
# VOC values in the air (volatile organic compounds)
# setup BME688 breakout sensor (i2c address= 0x77?)
from breakout_bme68x import BreakoutBME68X
bme688 = BreakoutBME68X(i2c)
#begin
# declear a list with initial number -41 and 86
# bme688 temperature sensor range is -40 to 85
bme688_temperature_list = [-41,86]
# declear a list with initial number -1 and 101
# bme688 humidity sensor range is 0 - 100
bme688_humidity_list=[-1,101]
#declear a list with initial number 299 and 1101
# bme688 pressure sensor range is 300 to 1100
bme688_pressure_list = [299,1101]
while True:
# sensors reading. Factory stated gas_index and meas_index will be zero.
temperature, pressure, humidity, gas_resistance, status, gas_index, meas_index = bme688.read()
# Temperature
# collect and sort
bme688_temperature_list.append(temperature)
bme688_temperature_list.sort()
# pick the 2nd and before last
bme688_temp_min = bme688_temperature_list[1]
bme688_temp_max = bme688_temperature_list[-2]
#remove duplicate so the list does not grow to infinite
bme688_temperature_list= list(set(bme688_temperature_list))
# Celsius to Fahrenheit
bme688_temperature_f = temperature * 1.8 + 32
# Humidity
bme688_humidity_list.append(humidity)
bme688_humidity_list.sort()
bme688_humidity_min = bme688_humidity_list[1]
bme688_humidity_max = bme688_humidity_list[-2]
bme688_humidity_list = list(set(bme688_humidity_list))
# Pressure
bme688_pressure_list.append(pressure)
bme688_pressure_list.sort()
bme688_pressure_min = bme688_pressure_list[1]
bme688_pressure_max = bme688_pressure_list[-2]
bme688_pressure_list = list(set(bme688_pressure_list))
# convert pressure (hPa) to other unit
# spec says hPa but I think I am getting 100 times hPa
# so i am here further divide the vaule by 100
# feel free to adjust accordingly
bme688_pressure_psi = ( pressure * 0.0145038 ) / 100
bme688_pressure_min = ( bme688_pressure_min * 0.0145038) / 100
bme688_pressure_max = ( bme688_pressure_max * 0.0145038) / 100
# Display
# font select bitmap6 bitmap8 bitmap14_outline sans gothic cursive serif_italic serif
display.set_font("serif")
# C degree @coordinate x=1 y=30
display.set_pen(white)
display.text('{:.1f}'.format(temperature) , 1, 30,240,2)
# @ coordinate x=5 y=65
display.text('{:.1f}'.format(bme688_temp_min), 5, 65,240,1)
# @coordinate x=95 y=65
display.text('{:.1f}'.format(bme688_temp_max) ,95 ,65,240,1)
# F degree @coordinate x=155 y=30
display.set_pen(yellow)
display.text('{:.0f}'.format(bme688_temperature_f) ,155,30,240,2)
# Humidity @coordinate x=1 y=105
display.set_pen(lightblue)
display.text('{:.1f}'.format(humidity) ,1,105,240,2)
# @coordinate x=5 y=140
display.text('{:.1f}'.format(bme688_humidity_min) ,5,140,240,1)
# @coordinate x=95 y=140
display.text('{:.1f}'.format(bme688_humidity_max) ,95,140,240,1)
# Pressure @coordinate x=5 y=180
display.set_pen(orange)
display.text('{:.1f}'.format(bme688_pressure_psi) ,5, 180,240,2)
# @coordinate x=5 y=215
display.text('{:.1f}'.format(bme688_pressure_min) ,5,215,240,1)
# @coordinate x=95 y=215
display.text('{:.1f}'.format(bme688_pressure_max) ,95,215,240,1)
# Gas @coordinate x=135 y=115
display.set_pen(violet)
display.text('{:.0f}'.format(gas_resistance) ,135, 115,240,1)
# Status @coordinate x=165 y=175
display.set_pen(green)
display.text('{:.0f}'.format(status) ,165,175,240,1)
# display refresh
display.update()
utime.sleep(1)
display.set_pen(black)
display.clear()
# BME688 Section end
The library used to read it likely factors into it. The Pimoroni code outputs in Pa. Pa is what I get on a Pi and Pico using the Pimoroni Python and Micro Python code.
The sensor reads in hPa, and outputs in hPA. What gets output by the code is in Pa.
As near as I can tell anyway.
I see, make sense now.
Thanks to clear that up for me. :-)
Keep in mind that the pressure changes very slowly over a long time frame. I have a Pi based setup that graphs Temperature, Pressure, and Humidity. The pressure is graphed over a 2 hour time frame. A 2mb change in 2 hours is considered “changing rapidly”.
Three display weather graphing setup - Discussion / Projects - Pimoroni Buccaneers
Just added 1 like to that
Neat little screens.
That one runs 24 / 7 and is a very good indication of how the weatheer is changing.
yea, says here. The function returns Pa
Below code includes SCD41, going to run it for a while.
Decided to use rv3028 with pi 4 instead, and a GPS breakout I have yet to buy.
If I could edit the post title to include SCD41, that would be nice.
p.s. with below code, pico will run froze after a while because of memory, I will adjust to use less list function and revisit.
# universal
import utime
import jpegdec
# setup breakout garden base
from pimoroni_i2c import PimoroniI2C
PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
# setup 1.54” square breakout LCD
# https://github.com/pimoroni/pimoroni-pico/tree/main/micropython/modules/picographics#drawing-text
import picographics
from picographics import PicoGraphics, DISPLAY_LCD_240X240, PEN_RGB332
display = PicoGraphics(display=DISPLAY_LCD_240X240, rotate=0, pen_type=PEN_RGB332)
display.set_backlight(0.5)
# define colors
black = display.create_pen(000, 000, 000)
lightblue = display.create_pen(000, 236, 255)
green = display.create_pen(000, 255, 000)
red = display.create_pen(255, 000, 000)
grey = display.create_pen(120, 120, 120)
orange = display.create_pen(255, 140, 000)
violet = display.create_pen(255, 000, 255)
yellow = display.create_pen(255, 255, 000)
white = display.create_pen(255, 255, 255)
# setup SCD41 breakout sensor
import breakout_scd41
breakout_scd41.init(i2c)
breakout_scd41.start()
# setup BME688 breakout sensor (i2c address= 0x77?)
from breakout_bme68x import BreakoutBME68X
bme688 = BreakoutBME68X(i2c)
# BME688 declear list section start
# air quality: IAQ indoor air quality index, calculated by Bosch software BSEC library
# air temperature: -40 .. 85cel
# air pressure : 300 .. 1100hPa
# air humidity : 0 .. 100%
# VOC values in the air (volatile organic compounds)
# declear a list with initial number -41 and 86
# bme688 temperature sensor range is -40 to 85
bme688_temperature_list = [-41,86]
# declear a list with initial number -1 and 101
# bme688 humidity sensor range is 0 - 100
bme688_humidity_list=[-1,101]
#declear a list with initial number 299 and 1101
# bme688 pressure sensor range is 300 to 1100
bme688_pressure_list = [299,1101]
# BME688 declear list section end
# SCD41 declear list section start
# CO2 measurement range 0 .. 40,000ppm
# measurment accuracy range 400 .. 5,000ppm
# Humidity measurement range 0% .. 100%RH
# Temperature measurement range -10 .. 60C
# scd41 temperature sensor range is -10 to 60
scd41_temperature_list = [-11,61]
# scd41 humidity sensor range is 0 to 100%
scd41_humidity_list = [-1,101]
#scd41 co2 sensor measurement accuracy is 400 to 5000ppm
scd41_co2_list = [399,5001]
# SCD41 declear list section end
#
while True:
# sensors reading. Factory stated gas_index and meas_index will be zero.
temperature, pressure, humidity, gas_resistance, status, gas_index, meas_index = bme688.read()
# Temperature
# collect and sort
bme688_temperature_list.append(temperature)
bme688_temperature_list.sort()
# pick the 2nd and before last
bme688_temp_min = bme688_temperature_list[1]
bme688_temp_max = bme688_temperature_list[-2]
#remove duplicate so the list does not grow to infinite
bme688_temperature_list= list(set(bme688_temperature_list))
# Celsius to Fahrenheit
bme688_temperature_f = temperature * 1.8 + 32
# Humidity
bme688_humidity_list.append(humidity)
bme688_humidity_list.sort()
bme688_humidity_min = bme688_humidity_list[1]
bme688_humidity_max = bme688_humidity_list[-2]
bme688_humidity_list = list(set(bme688_humidity_list))
# Pressure
bme688_pressure_list.append(pressure)
bme688_pressure_list.sort()
bme688_pressure_min = bme688_pressure_list[1]
bme688_pressure_max = bme688_pressure_list[-2]
bme688_pressure_list = list(set(bme688_pressure_list))
# convert pressure (Pa) to other unit
# read function return value in Pa
# sensor value in hPa
bme688_pressure_psi = ( pressure * 0.0145038 ) / 100
#bme688_pressure_min = ( bme688_pressure_min * 0.0145038) / 100
#bme688_pressure_max = ( bme688_pressure_max * 0.0145038) / 100
# Display
# font select bitmap6 bitmap8 bitmap14_outline sans gothic cursive serif_italic serif
display.set_font("serif")
# C degree @coordinate x=1 y=30
display.set_pen(white)
display.text('{:.1f}'.format(temperature) , 1, 30,240,2)
# @ coordinate x=5 y=65
display.text('{:.1f}'.format(bme688_temp_min), 5, 65,240,1)
# @coordinate x=95 y=65
display.text('{:.1f}'.format(bme688_temp_max) ,95 ,65,240,1)
# F degree @coordinate x=155 y=30
display.set_pen(yellow)
display.text('{:.0f}'.format(bme688_temperature_f) ,155,30,240,2)
# Humidity @coordinate x=1 y=105
display.set_pen(lightblue)
display.text('{:.1f}'.format(humidity) ,1,105,240,2)
# @coordinate x=5 y=140
display.text('{:.1f}'.format(bme688_humidity_min) ,5,140,240,1)
# @coordinate x=95 y=140
display.text('{:.1f}'.format(bme688_humidity_max) ,95,140,240,1)
# Pressure @coordinate x=5 y=180
display.set_pen(orange)
display.text('{:.1f}'.format(bme688_pressure_psi) ,5, 180,240,2)
# @coordinate x=5 y=215
#display.text('{:.1f}'.format(bme688_pressure_min) ,5,215,240,1)
# @coordinate x=95 y=215
#display.text('{:.1f}'.format(bme688_pressure_max) ,95,215,240,1)
# Gas @coordinate x=135 y=115
display.set_pen(violet)
display.text('{:.0f}'.format(gas_resistance) ,135, 115,240,1)
# Status @coordinate x=165 y=175
display.set_pen(green)
display.text('{:.0f}'.format(status) ,165,175,240,1)
# display refresh
display.update()
utime.sleep(5)
display.set_pen(black)
display.clear()
# BME688 Section end
# SCD41 Section start
#if breakout_scd41.ready():
scd41_co2,scd41_temperature,scd41_humidity = breakout_scd41.measure()
# Temperature
# collect and sort
scd41_temperature_list.append(scd41_temperature)
scd41_temperature_list.sort()
# pick the 2nd and before last
scd41_temp_min = scd41_temperature_list[1]
scd41_temp_max = scd41_temperature_list[-2]
#remove duplicate so the list does not grow to infinite
scd41_temperature_list= list(set(scd41_temperature_list))
# Humidity
# collect and sort
scd41_humidity_list.append(scd41_humidity)
scd41_humidity_list.sort()
# pick the 2nd and before last
scd41_humidity_min = scd41_humidity_list[1]
scd41_humidity_max = scd41_humidity_list[-2]
#remove duplicate so the list does not grow to infinite
scd41_humidity_list= list(set(scd41_humidity_list))
# co2
# collect and sort
scd41_co2_list.append(scd41_co2)
scd41_co2_list.sort()
# pick the 2nd and before last
scd41_co2_min = scd41_co2_list[1]
scd41_co2_max = scd41_co2_list[-2]
#remove duplicate so the list does not grow to infinite
scd41_co2_list= list(set(scd41_co2_list))
# Display
# font select bitmap6 bitmap8 bitmap14_outline sans gothic cursive serif_italic serif
display.set_font("serif")
# C degree @coordinate x=1 y=30
display.set_pen(white)
display.text('{:.1f}'.format(scd41_temperature) ,1, 30,240,2)
# @ coordinate x=5 y=65
display.text('{:.1f}'.format(scd41_temp_min), 5, 65,240,1)
# @coordinate x=95 y=65
display.text('{:.1f}'.format(scd41_temp_max) ,95 ,65,240,1)
# Humidity @coordinate x=1 y=105
display.set_pen(lightblue)
display.text('{:.1f}'.format(scd41_humidity) ,1,105,240,2)
# @coordinate x=5 y=140
display.text('{:.1f}'.format(scd41_humidity_min) ,5,140,240,1)
# @coordinate x=95 y=140
display.text('{:.1f}'.format(scd41_humidity_max) ,95,140,240,1)
# co2 @coordinate x=5 y=180
display.set_pen(violet)
display.text('{:.0f}'.format(scd41_co2) ,1,180,240,2)
# @coordinate x=5 y=215
display.text('{:.0f}'.format(scd41_co2_min) ,5,215,240,1)
# @coordinate x=95 y=215
display.text('{:.0f}'.format(scd41_co2_max) ,115,215,240,1)
# display refresh
display.update()
utime.sleep(5)
display.set_pen(black)
display.clear()
# SCD41 Section end
The current and forecast pressure settings for local airfields can provide a useful sanity check for your local pressure readings. These are readily available online from a number of web sites eg METAR TAF : Gloucestershire Airport, Gloucester England
You may also be interested in adjusting for any difference in height between your location and the airfield elevation. This can easily be done either manually, or using an online calculator such as Conversion to sea-level pressure Calculator - High accuracy calculation