It's a exercise for Raspberry Pi Pico running CircuitPython 6.2.0-beta.2, to read AHT20+BMP280 Temperature, Humidity and Pressure Sensor Module, and display on SSD1306 I2C OLED.
AHT20+BMP280 Digital Temperature, Humidity and Pressure Sensor Module
It's a module adopts the digital temperature and humidity sensor AHT20 and Bosch BPM280 composed of Aosong, I2C mainstream output,
In this exercise, both the I2C from AHT20+BMP280 module and from SSD1306 OLED connect to one common I2C port of Raspberry Pi Pico.
Visit https://circuitpython.org/libraries, download the appropriate bundle for your version of CircuitPython. Unzip the file, and copy the needed file/directory to /lib directory of your Raspberry Pi Pico CIRCUITPY driver.
cpyPico_bmp280_simpletest.py, read BMP280 sensor. Basically it is modifed from the bmp280_simpletest.py example come with the downloaed Adafruit CircuitPython Library, with change of GPIO for I2C only.
If you looking for read the sensor module only, only adafruit_ahtx0.mpy and adafruit_bmp280.mpy are needed. adafruit_displayio_ssd1306.mpy, adafruit_display_shapes and adafruit_display_text directories are needed for ssd1306 I2C OLED.
For more on using ssd1306 with adafruit_displayio_ssd1306.mpy (framebuffer), refer last post "Raspberry Pi Pico/CircuitPython + ssd1306 I2C OLED using adafruit_displayio_ssd1306 driver".
Example code:
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
"""Simpletest Example that shows how to get temperature,
pressure, and altitude readings from a BMP280"""
import time
import board
# import digitalio # For use with SPI
import busio
import adafruit_bmp280
# Create library object using our Bus I2C port
#i2c = busio.I2C(board.SCL, board.SDA)
SDA = board.GP8
SCL = board.GP9
i2c = busio.I2C(SCL, SDA)
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)
# OR create library object using our Bus SPI port
# spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
# bmp_cs = digitalio.DigitalInOut(board.D10)
# bmp280 = adafruit_bmp280.Adafruit_BMP280_SPI(spi, bmp_cs)
# change this to match the location's pressure (hPa) at sea level
bmp280.sea_level_pressure = 1013.25
while True:
print("\nTemperature: %0.1f C" % bmp280.temperature)
print("Pressure: %0.1f hPa" % bmp280.pressure)
print("Altitude = %0.2f meters" % bmp280.altitude)
time.sleep(2)
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
import time
import board
import adafruit_ahtx0
import busio
# Create the sensor object using I2C
SDA = board.GP8
SCL = board.GP9
i2c = busio.I2C(SCL, SDA)
sensor = adafruit_ahtx0.AHTx0(i2c)
#sensor = adafruit_ahtx0.AHTx0(board.I2C())
while True:
print("\nTemperature: %0.1f C" % sensor.temperature)
print("Humidity: %0.1f %%" % sensor.relative_humidity)
time.sleep(2)
"""
Raspberry Pi Pico/CircuitPython exercise
to read BMP280 using adafruit_bmp280,
display on ssd1306 I2C OLED using adafruit_displayio_ssd1306
"""
import os
import time
import board
import busio
import adafruit_bmp280
import displayio
import terminalio
import adafruit_displayio_ssd1306
from adafruit_display_text import label
displayio.release_displays()
print()
print("Machine: \t\t\t" + os.uname()[4])
print("CircuitPython: \t\t\t" + os.uname()[3])
print(adafruit_bmp280.__name__ + " : \t\t" + adafruit_bmp280.__version__)
print(adafruit_displayio_ssd1306.__name__ + " : \t" + adafruit_displayio_ssd1306.__version__)
print()
# I2C common used by AHT20/BMP280 module and ssd1306 I2C OLED
SDA = board.GP8
SCL = board.GP9
i2c = busio.I2C(SCL, SDA)
#display connected I2C devices address
if(i2c.try_lock()):
print("i2c.scan(): " + str(i2c.scan()))
i2c.unlock()
print()
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)
# change this to match the location's pressure (hPa) at sea level
bmp280.sea_level_pressure = 1013.25
ssd1306_i2c_addr = 60
display_width =128
display_height = 64
NUM_OF_COLOR = 2
display_bus = displayio.I2CDisplay(i2c, device_address=ssd1306_i2c_addr)
display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=display_width, height=display_height)
#================================================
# Make the display context
group = displayio.Group(max_size=10)
bitmap = displayio.Bitmap(display_width, display_height, NUM_OF_COLOR)
bitmap_palette = displayio.Palette(NUM_OF_COLOR)
bitmap_palette[0] = 0x000000
bitmap_palette[1] = 0xFFFFFF
tileGrid = displayio.TileGrid(bitmap,
pixel_shader=bitmap_palette,
x=0, y=0)
group.append(tileGrid)
# Draw a label
text_group = displayio.Group(max_size=10, scale=2)
text_temp = label.Label(terminalio.FONT, text="temperature:", color=0xFFFFFF)
text_temp.anchor_point = (0.0, 0.0)
text_temp.anchored_position = (0, 0)
text_pres = label.Label(terminalio.FONT, text="pressure:", color=0xFFFFFF)
text_pres.anchor_point = (0.0, 0.0)
text_pres.anchored_position = (0, 10)
text_alti = label.Label(terminalio.FONT, text="altitude:", color=0xFFFFFF)
text_alti.anchor_point = (0.0, 0.0)
text_alti.anchored_position = (0, 20)
text_group.append(text_temp)
text_group.append(text_pres)
text_group.append(text_alti)
group.append(text_group)
display.show(group)
#================================================
time.sleep(0.5)
text_temp.text = "%0.1f C" % bmp280.temperature
text_pres.text = "%0.1f hPa" % bmp280.pressure
text_alti.text = "%0.2f m" % bmp280.altitude
print("\nTemperature: %0.1f C" % bmp280.temperature)
print("Pressure: %0.1f hPa" % bmp280.pressure)
print("Altitude = %0.2f meters" % bmp280.altitude)
while True:
temp = bmp280.temperature
pres = bmp280.pressure
alti = bmp280.altitude
text_temp.text = "%0.1f C" % temp
text_pres.text = "%0.1f hPa" % pres
text_alti.text = "%0.2f m" % alti
print("\nTemperature: %0.1f C" % temp)
print("Pressure: %0.1f hPa" % pres)
print("Altitude = %0.2f meters" % alti)
time.sleep(2)
#print("- bye -")
while True:
pass
"""
Raspberry Pi Pico/CircuitPython exercise
to read AHT20 using adafruit_ahtx0,
display on ssd1306 I2C OLED using adafruit_displayio_ssd1306
"""
import os
import time
import board
import adafruit_ahtx0
import busio
import displayio
import terminalio
import adafruit_displayio_ssd1306
from adafruit_display_text import label
from adafruit_display_shapes.roundrect import RoundRect
from adafruit_display_shapes.rect import Rect
displayio.release_displays()
print()
print("Machine: \t\t\t" + os.uname()[4])
print("CircuitPython: \t\t\t" + os.uname()[3])
print(adafruit_ahtx0.__name__ + " : \t\t" +
adafruit_ahtx0.__version__)
print(adafruit_displayio_ssd1306.__name__ + " : \t" +
adafruit_displayio_ssd1306.__version__)
print()
# I2C common used by AHT20/BMP280 module and ssd1306 I2C OLED
SDA = board.GP8
SCL = board.GP9
i2c = busio.I2C(SCL, SDA)
#display connected I2C devices address
if(i2c.try_lock()):
print("i2c.scan(): " + str(i2c.scan()))
i2c.unlock()
print()
ath20 = adafruit_ahtx0.AHTx0(i2c)
ssd1306_i2c_addr = 60
display_width =128
display_height = 64
NUM_OF_COLOR = 2
display_bus = displayio.I2CDisplay(i2c, device_address=ssd1306_i2c_addr)
display = adafruit_displayio_ssd1306.SSD1306(display_bus, width=display_width, height=display_height)
"""
ref:
Adafruit Display_Text Library
~ https://circuitpython.readthedocs.io/projects/display_text/en/latest/index.html
Adafruit Display_Shapes Library
~ https://circuitpython.readthedocs.io/projects/display-shapes/en/latest/index.html
"""
#================================================
# Make the display context
group = displayio.Group(max_size=10)
bitmap = displayio.Bitmap(display_width, display_height, NUM_OF_COLOR)
bitmap_palette = displayio.Palette(NUM_OF_COLOR)
bitmap_palette[0] = 0x000000
bitmap_palette[1] = 0xFFFFFF
tileGrid = displayio.TileGrid(bitmap,
pixel_shader=bitmap_palette,
x=0, y=0)
group.append(tileGrid)
#---------------------------
group_temp = displayio.Group(max_size=10, scale=1)
group_temp.x = 0
group_temp.y = 0
label_temp = label.Label(terminalio.FONT, text="temperature", color=0xFFFFFF)
label_temp.anchor_point = (0.0, 0.0)
label_temp.anchored_position = (0, 0)
label_temp_width = label_temp.bounding_box[2]
label_temp_height = label_temp.bounding_box[3]
shape_temp = RoundRect(x=0, y=0,
width=label_temp_width,
height=label_temp_height,
r=6,
fill=0x000000,
outline=0xFFFFFF, stroke=1)
group_temp.append(shape_temp)
group_temp.append(label_temp)
#---------------------------
group_humi = displayio.Group(max_size=10, scale=1)
group_humi.x = 40
group_humi.y = 30
label_humi = label.Label(terminalio.FONT, text="humidity", color=0xFFFFFF)
label_humi.anchor_point = (0.0, 0.0)
label_humi.anchored_position = (0, 0)
label_humi_width = label_humi.bounding_box[2]
label_humi_height = label_humi.bounding_box[3]
shape_humi = Rect(x=0, y=0,
width=label_humi_width,
height=label_humi_height,
fill=0x000000,
outline=0xFFFFFF, stroke=1)
group_humi.append(shape_humi)
group_humi.append(label_humi)
#---------------------------
group.append(group_humi)
group.append(group_temp)
display.show(group)
#================================================
#prepare for moving
tempXMove = +1
tempYMove = +1
tempXLim = display_width - 1 - label_temp_width
tempYLim = display_height - 1 - label_temp_height
humiXMove = -1
humiYMove = +1
humiXLim = display_width - 1 - label_humi_width
humiYLim = display_height - 1 - label_humi_height
NxMeasureMs = time.monotonic() + 3
while True:
time.sleep(0.05)
if time.monotonic() > NxMeasureMs:
NxMeasureMs = time.monotonic() + 1
temp = ath20.temperature
humi = ath20.relative_humidity
label_temp.text = " %0.1f C" % temp
label_humi.text = " %0.1f %% " % humi
print("\nTemperature: %0.1f C" % temp)
print("Humidity: %0.1f %%" % humi)
#Move Temperate group
x = group_temp.x + tempXMove
group_temp.x = x
if tempXMove > 0:
if x >= tempXLim:
tempXMove = -1
else:
if x <= 0:
tempXMove = +1
y = group_temp.y + tempYMove
group_temp.y = y
if tempYMove > 0:
if y > tempYLim:
tempYMove = -1
else:
if y <= 0:
tempYMove = +1
#Move Humidity group
x = group_humi.x + humiXMove
group_humi.x = x
if humiXMove > 0:
if x >= humiXLim:
humiXMove = -1
else:
if x <= 0:
humiXMove = +1
y = group_humi.y + humiYMove
group_humi.y = y
if humiYMove > 0:
if y > humiYLim:
humiYMove = -1
else:
if y <= 0:
humiYMove = +1
No comments:
Post a Comment