I have given it a good try to make my Tufty work with my SDC-41 CO2 sensor but I am having no luck, mainly because I have no programming skills but also because I have no luck.
If there is anyone out there with a working sketch they don’t mind sharing that would be great, barring that are there any talented people out there that want to make a few bucks?
The end goal is to display my name and title, centered and the CO2 level in one of the corners.
What code have you tried so far, examples etc, and did they work?
I don’t have that breakout but I do have a BME280 wired up to my Tufty displaying the temperature, humidity and pressure. I can post it if you want to have a look.
This is my current attempt to get the sensor up:
import time
import pimoroni_i2c
import breakout_scd41
from picographics import PicoGraphics, DISPLAY_TUFTY_2040, PEN_RGB332
display = PicoGraphics(display=DISPLAY_TUFTY_2040, pen_type=PEN_RGB332, rotate=180)
PINS_BREAKOUT_GARDEN = {“sda”: 4, “scl”: 5}
PINS_PICO_EXPLORER = {“sda”: 20, “scl”: 21}
i2c = pimoroni_i2c.PimoroniI2C(**PINS_PICO_EXPLORER)
breakout_scd41.init(i2c)
breakout_scd41.start()
display.set_backlight(1.0)
display.set_pen(background_pen)
display.clear()
while True:
if breakout_scd41.ready():
co2, temperature, humidity = breakout_scd41.measure()
display.set_pen(display.create_pen(0, 0, 0))
display.set_font(‘bitmap8’)
display.text(co2, 75, 10, 320, 5)
time.sleep(1.0)
I suspect (although I can’t double check, with a lack of Tufty in my life!) that you want to be using PINS_BREAKOUT_GARDEN rather than PINS_PICO_EXPLORER.
Or at least, that’s my first thought trying to make sense of the Tufty schematic :-)
Still crashing :(
import time
import pimoroni_i2c
import breakout_scd41
from picographics import PicoGraphics, DISPLAY_TUFTY_2040, PEN_RGB332
display = PicoGraphics(display=DISPLAY_TUFTY_2040, pen_type=PEN_RGB332, rotate=180)
PINS_BREAKOUT_GARDEN = {“sda”: 4, “scl”: 5}
i2c = pimoroni_i2c.PimoroniI2C(**PINS_BREAKOUT_GARDEN)
breakout_scd41.init(i2c)
breakout_scd41.start()
display.set_backlight(1.0)
display.set_pen(background_pen)
display.clear()
while True:
if breakout_scd41.ready():
co2, temperature, humidity = breakout_scd41.measure()
display.set_pen(display.create_pen(0, 0, 0))
display.set_font(‘bitmap8’)
display.text(co2, 75, 10, 320, 5)
time.sleep(1.0)
I know the address of this breakout is 0x62, maybe that is different than the 41? I asked support if this Adafruit SDC40 would work and they said it was the same, but maybe the address is different?
What you say “crashing”, what exactly is happening? Are you getting an error message?
Looking at the SCD41 code, it looks to be expecting 0x62 so that’s not it.
(side note; if you enclose your code in ``` then it should format it nicely, and make it easier for us to make sense of!)
Thanks for the tip.
By crashing I mean the display stops and no numbers are printed.
Well, it looks like you’re not refreshing the display (display.update() after you’ve added your text), for a start.
You probably also want to clear the display before you start writing to it, or it will get messy, but let’s get you displaying something before worrying about that :)
Warning wall of code to follow. This is my Tufty BME280 code.
If you click the </> (Preformatted Text) option its the same as using code tags.
i2c = PimoroniI2C(sda=(4), scl=(5)) is what I use, and it is pins 4 and 5, not 20, 21.
You want to
get your info
display your info
display.update()
time.sleep
display.set_pen(black)
display.clear()
wash,rinse and repeat. ;)
import utime
import machine
import picographics
from picographics import PicoGraphics, DISPLAY_TUFTY_2040, PEN_RGB332
display = PicoGraphics(display=DISPLAY_TUFTY_2040, rotate=180, pen_type=PEN_RGB332)
display.set_backlight(1.0)
display.set_font("bitmap8")
from breakout_bme280 import BreakoutBME280
from pimoroni_i2c import PimoroniI2C
i2c = PimoroniI2C(sda=(4), scl=(5))
bme = BreakoutBME280(i2c)
from breakout_rtc import BreakoutRTC
from machine import RTC
RV3028 = BreakoutRTC(i2c)
rtc = BreakoutRTC(i2c)
if rtc.is_12_hour:
rtc.set_24_hour()
from machine import ADC, Pin
# set up the ADCs for measuring battery voltage
vbat_adc = ADC(29)
vref_adc = ADC(28)
vref_en = Pin(27)
vref_en.init(Pin.OUT)
vref_en.value(0)
usb_power = Pin(24, Pin.IN)
full_battery = 4.5
empty_battery = 2.5
# Setup light sensor
lux_pwr = Pin(27, Pin.OUT)
lux_pwr.value(1) # Turn on power!
lux = ADC(26)
from pimoroni import Button
button_a = Button(7, invert=False)
button_b = Button(8, invert=False)
button_c = Button(9, invert=False)
button_up = Button(22, invert=False)
button_down = Button(6, invert=False)
button_boot = Button(23, invert=True)
t_color = display.create_pen(0,255,0)
h_color = display.create_pen(0,255,0)
p_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)
display.set_pen(black)
display.clear()
# converts the temperature into a description and pen colour
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
# converts humidity into good/bad description and pen color
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
# converts pressure into barometer-type description and pen color
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
# graphs current values for Temperature, Humidity and Pressure
def draw_graph(temp_value, press_value, humid_value):
scaled_temp = int(temperature * 10)
if scaled_temp <= 9:
scaled_temp =9
if scaled_temp >= 310:
scaled_temp =310
describe_temperature(temperature)
display.set_pen(yellow)
display.circle(9,98,9)
display.rectangle(9,89,116,19)
display.set_pen(green)
#display.rectangle(127,89,38,19)
display.rectangle(127,89,38,19)
display.set_pen(green)
display.rectangle(165,89,73,19)
display.set_pen(orange)
display.rectangle(240,89,28,19)
display.set_pen(red)
display.rectangle(270,89,44,19)
display.circle(310,98,9)
display.set_pen(black)
display.circle((scaled_temp),98,9)
display.set_pen(white)
display.circle((scaled_temp),98,5)
display.set_pen(t_color)
display.text(describe_temperature(temperature),130,52,scale=4)
scaled_humid = int(humidity * (320 / 100))
if scaled_humid <= 9:
scaled_humid =9
if scaled_humid >= 310:
scaled_humid =310
describe_humidity(humidity)
display.set_pen(red)
display.circle(9, 164, 9)
display.rectangle(12,155,82,19)
display.set_pen(green)
display.rectangle(96,155,94,19)
display.set_pen(yellow)
display.rectangle(192,155,62,19)
display.set_pen(orange)
display.rectangle(256,155,55,19)
display.circle(310,164,9)
display.set_pen(black)
display.circle((scaled_humid),164,9)
display.set_pen(white)
display.circle((scaled_humid),164,5)
display.set_pen(h_color)
display.text(describe_humidity(humidity),130,117,scale=4)
scaled_press = int((pressuremb - 960) * 3)
if scaled_press <= 9:
scaled_press =9
if scaled_press >= 310:
scaled_press =310
describe_pressure(pressuremb)
display.set_pen(red)
display.circle(9, 230, 9)
display.rectangle(12,221,50,19)
display.set_pen(yellow)
display.rectangle(64,221,62,19)
display.set_pen(green)
display.rectangle(128,221,62,19)
display.set_pen(blue)
display.rectangle(192,221,62,19)
display.set_pen(orange)
display.rectangle(256,221,52,19)
display.circle(310, 230, 9)
display.set_pen(black)
display.line(127,221,127,240)
display.circle((scaled_press),230,9)
display.set_pen(white)
display.circle((scaled_press),230,5)
display.set_pen(p_color)
display.text(describe_pressure(pressuremb),130,184,scale=4)
def describe_month(month):
month = rtc.get_month()
if month == 1:
description = "January"
elif month == 2:
description = "February"
elif month == 3:
description = "March"
elif month == 4:
description = "April"
elif month == 5:
description = "May"
elif month == 6:
description = "June"
elif month == 7:
description = "July"
elif month == 8:
description = "August"
elif month == 9:
description = "September"
elif month == 10:
description = "October"
elif month == 11:
description = "November"
elif month == 12:
description = "December"
return description
def describe_date(date):
date = rtc.get_date()
if date == 1:
description = "st"
elif date == 2:
description = "nd"
elif date == 3:
description = "rd"
elif date == 21:
description = "st"
elif date == 22:
description = "nd"
elif date == 23:
description = "rd"
elif date == 31:
description = "st"
else:
description = "th"
return description
start_time = utime.time()
while True:
time_elapsed = utime.time() - start_time
hours = rtc.get_hours()
minutes = rtc.get_minutes()
month = rtc.get_month()
date = rtc.get_date()
if rtc.read_periodic_update_interrupt_flag():
rtc.clear_periodic_update_interrupt_flag()
if rtc.update_time():
rtc_date = rtc.string_date()
rtc_time = rtc.string_time()
if button_a.is_pressed:
print ("Button A pressed")
utime.sleep(0.2)
if button_b.is_pressed:
if percentage >= 50:
display.set_pen(green)
display.text("Battery",0,9,scale=3)
display.text("{:0.2f}v".format(vbat),150,9,scale=3)
display.text("{:0.0f}%".format(percentage),265,9,scale=3)
elif 50 > percentage > 20:
display.set_pen(yellow)
display.text("Battery",0,9, scale=3)
display.text("{:0.2f}v".format(vbat),150,9,scale=3)
display.text("{:0.0f}%".format(percentage),265,9,scale=3)
elif percentage <= 20:
display.set_pen(red)
display.text("Battery",0,9,scale=3)
display.text("{:0.2f}v".format(vbat),150,9,scale=3)
display.text("{:0.0f}%".format(percentage),265,9,scale=3)
else:
display.set_pen(white)
if hours == 0:
display.text(f"{12}:{minutes:02} AM",5,9,scale=3)
elif 0 < hours < 10:
display.text(f"{hours:1}:{minutes:02} AM",5,9,scale=3)
elif 10 <= hours < 12:
display.text(f"{hours:2}:{minutes:02} AM",0,9,scale=3)
elif hours == 12:
display.text(f"{hours:2}:{minutes:02} PM",0,9,scale=3)
elif hours >12:
hours = hours - 12
if hours <10:
display.text(f"{hours:1}:{minutes:02} PM",5,9,scale=3)
elif 10 <= hours < 12:
display.text(f"{hours:2}:{minutes:02} PM",0,9,scale=3)
elif hours == 12:
display.text(f"{hours:2}:{minutes:02} AM",0,9,scale=3)
display.text(f"{describe_month(month)} {date}{describe_date(date)}",130,9,scale=3)
if button_c.is_pressed:
print ("Button C pressed")
utime.sleep(0.2)
if button_up.is_pressed:
display.set_backlight(1.0)
utime.sleep(0.2)
if button_down.is_pressed:
display.set_backlight(0.4)
utime.sleep(0.2)
if button_boot.is_pressed:
print ("Button BOOT/USR pressed")
utime.sleep(0.2)
#reading = lux.read_u16()
#print (reading)
temperature, pressure, humidity = bme.read()
pressuremb = pressure / 100
temperature = round(temperature)
humidity = round(humidity)
pressure = round(pressure)
display.set_pen(white)
display.text("{:0.0f}°C" .format(temperature), 5, 52, scale=4)
display.text("{:0.0f}%".format(humidity), 5, 118, scale=4)
display.text("{:0.0f}mb".format(pressuremb), 5, 184, scale=4)
draw_graph(temperature, pressure, humidity)
vref_en.value(1)
vdd = 1.24 * (65535 / vref_adc.read_u16())
vbat = (
(vbat_adc.read_u16() / 65535) * 3 * vdd
)
vref_en.value(0)
# convert the raw ADC read into a voltage, and then a percentage
percentage = 100 * ((vbat - empty_battery) / (full_battery - empty_battery))
if percentage > 100:
percentage = 100
if percentage < 0:
percentage = 0
if time_elapsed < 0.5:
temperature, pressure, humidity = bme.read()
display.set_pen(black)
display.clear()
display.update()
utime.sleep(1)
else:
display.update()
utime.sleep(1)
display.set_pen(black)
display.clear()
utime.sleep(1)