109 lines
3.4 KiB
Python
109 lines
3.4 KiB
Python
# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import time
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import board
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import simpleio
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import adafruit_bmp280
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import pwmio
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import displayio
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from adafruit_motor import servo
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import terminalio
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from adafruit_clue import clue
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from adafruit_display_text import label
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# pwm setup for servo
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pwm = pwmio.PWMOut(board.D0, duty_cycle=2 ** 15, frequency=50)
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gauge = servo.Servo(pwm)
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# bmp280 sensor setup
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i2c = board.I2C() # uses board.SCL and board.SDA
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# i2c = board.STEMMA_I2C() # For using the built-in STEMMA QT connector on a microcontroller
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bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)
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# change depending on your location's elevation
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NOMINAL_PRESSURE = 1005.94
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PRESSURE_RANGE = 40 # hPa, expected pressure range variance caused by local weather
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PRESSURE_LOW_LIM = NOMINAL_PRESSURE - PRESSURE_RANGE
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PRESSURE_HIGH_LIM = NOMINAL_PRESSURE + PRESSURE_RANGE
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# board display
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# scaling for terminalio font
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display = board.DISPLAY
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group = displayio.Group(scale=3)
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# text elements
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temp_header = "Temperature:"
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press_header = "Pressure:"
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temp_text = " ºC"
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press_text = " hPa"
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font = terminalio.FONT
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blue = 0x0000FF
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red = 0xFF0000
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# temperature text elements
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temp_label = label.Label(font, text=temp_header, color=red, x=5, y=10)
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temp_data = label.Label(font, text=temp_text, color=red, x=5, y=25)
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# pressure text elements
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press_label = label.Label(font, text=press_header, color=blue, x=5, y=50)
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press_data = label.Label(font, text=press_text, color=blue, x=5, y=65)
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# adding text to display group
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group.append(temp_label)
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group.append(press_label)
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group.append(temp_data)
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group.append(press_data)
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display.root_group = group
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# function to convert celsius to fahrenheit
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def c_to_f(temp):
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temp_f = (temp * 9/5) + 32
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return temp_f
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# function to convert hPa to inHg
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def hpa_to_inHg(hPa):
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inches_mercury = hPa * 0.02953
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return inches_mercury
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# time.monotonic clock
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clock = 0
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# units state
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metric_units = False
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while True:
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# non-blocking 2 second delay
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if (clock + 2) < time.monotonic():
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# map servo range to barometric pressure range
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servo_value = simpleio.map_range(bmp280.pressure,
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PRESSURE_LOW_LIM, PRESSURE_HIGH_LIM, 180, 0)
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# set servo to pressure
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gauge.angle = servo_value
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# print data for debugging
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print("\nTemperature: %0.1f C" % bmp280.temperature)
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print("Pressure: %0.1f hPa" % bmp280.pressure)
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print(servo_value)
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# if metric units...
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if metric_units:
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# update temp & pressure text in celsius and hPa
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temp_data.text = "%0.1f ºC" % bmp280.temperature
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press_data.text = "%0.1f hPa" % bmp280.pressure
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# if imperial units...
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else:
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# convert celsius to fahrenheit
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temp_fahrenheit = c_to_f(bmp280.temperature)
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# convert hPa to inHg
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pressure_inHg = hpa_to_inHg(bmp280.pressure)
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# update temp & pressure text
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temp_data.text = "%0.1f ºF" % temp_fahrenheit
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press_data.text = "%0.1f inHg" % pressure_inHg
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# reset time.monotonic() clock
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clock = time.monotonic()
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# if a button is pressed, metric_units is True, show metric
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if clue.button_a:
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metric_units = True
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# if b button is pressed, metric_units is False, show imperial units
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if clue.button_b:
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metric_units = False
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