Desktop Multifunction Device: Time and Temperature

Last updated February 25, 2024

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Reading the Sensor

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Let's add temperature to the multifunction device using the ADT7410 on the Temperature and Motion Wing.

See Multifunction Device Part 1 for a parts list and assembly instructions.

Reading the Sensor

First we need to set up the sensor:

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#Import the `adafruit_adt7410` library
#get the I2C device
#instantiate the sensor:

import board
import adafruit_adt7410
i2c = board.I2C()
therm = adafruit_adt7410.ADT7410(i2c)

#functions to read the sensor:
def get_temp_C():
    "Temperature Celsius"
    T = therm.temperature
    return f"{T:0.1f} C"

def get_temp_F():
    "Temperature Fahrenheit"
    T = therm.temperature * 1.8 + 32
    return f"{T:0.1f} F"

#Import the `adafruit_adt7410` library
#get the I2C device
#instantiate the sensor:

import board
import adafruit_adt7410
i2c = board.I2C()
therm = adafruit_adt7410.ADT7410(i2c)

#functions to read the sensor:
def get_temp_C():
    "Temperature Celsius"
    T = therm.temperature
    return f"{T:0.1f} C"

def get_temp_F():
    "Temperature Fahrenheit"
    T = therm.temperature * 1.8 + 32
    return f"{T:0.1f} F"

We need a Label to display the sensor readings. We'll add it to our 'splash' screen. Then we'll write a function to update the label.

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import displayio
from adafruit_bitmap_font.bitmap_font import load_font
from adafruit_display_text.label import Label

METRIC = True
display = board.DISPLAY
splash = displayio.Group()
arial = load_font("/fonts/Arial-18.pcf")
temperature = Label(
	arial,
    text = "10.0 K",
    color = 0x3333FF,
    x = display.width * 3 // 8,
    y = display.height * 3 // 8)

display.root_group = splash

def loop():
    if METRIC:
        temperature.text = get_temp_C()
    else:
        temperataure.text = get_temp_F()

if __name__=="__main__":
    while True:
        loop()
        time.sleep(0.1)

import displayio
from adafruit_bitmap_font.bitmap_font import load_font
from adafruit_display_text.label import Label

METRIC = True
display = board.DISPLAY
splash = displayio.Group()
arial = load_font("/fonts/Arial-18.pcf")
temperature = Label(
	arial,
    text = "10.0 K",
    color = 0x3333FF,
    x = display.width * 3 // 8,
    y = display.height * 3 // 8)

display.root_group = splash

def loop():
    if METRIC:
        temperature.text = get_temp_C()
    else:
        temperataure.text = get_temp_F()

if __name__=="__main__":
    while True:
        loop()
        time.sleep(0.1)

You can find the Arial-18 font here: MagTag Google Calendar. Make a '/fonts' folder on your CIRCUITPY drive and save the font there.

A complete sketch is available on Github: code.py

This page (Desktop Multifunction Device: Time and Temperature) was last updated on February 25, 2024.