Adding code for CLUE servo barometer

Adding code for the CLUE Servo Barometer project. Servo's range is mapped to barometric pressure range. CLUE's display shows temperature and pressure readings. A button and B button determine if the readings are shown in US or imperial units

Author: BlitzCityDIY

CLUE_Servo_Barometer/code.py

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+# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import simpleio
+import adafruit_bmp280
+import pwmio
+import displayio
+from adafruit_motor import servo
+import terminalio
+from adafruit_clue import clue
+from adafruit_display_text import label
+
+#  board display
+#  scaling for terminalio font
+display = board.DISPLAY
+group = displayio.Group(scale=3)
+
+#  text elements
+temp_header = "Temperature:"
+press_header = "Pressure:"
+temp_text = "   ºC"
+press_text = "   hPa"
+font = terminalio.FONT
+blue = 0x0000FF
+red = 0xFF0000
+
+#  pwm setup for servo
+pwm = pwmio.PWMOut(board.D0, duty_cycle=2 ** 15, frequency=50)
+gauge = servo.Servo(pwm)
+
+#  bmp280 sensor setup
+i2c = board.I2C()  # uses board.SCL and board.SDA
+bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)
+
+bmp280.sea_level_pressure = 1013.25
+
+#  temperature text elements
+temp_label = label.Label(font, text=temp_header, color=red, x=5, y=10)
+temp_data = label.Label(font, text=temp_text, color=red, x=5, y=25)
+
+#  pressure text elements
+press_label = label.Label(font, text=press_header, color=blue, x=5, y=50)
+press_data = label.Label(font, text=press_text, color=blue, x=5, y=65)
+
+#  adding text to display group
+group.append(temp_label)
+group.append(press_label)
+group.append(temp_data)
+group.append(press_data)
+
+display.show(group)
+
+#  function to convert celcius to fahrenheit
+def c_to_f(temp):
+    temp_f = (temp * 9/5) + 32
+    return temp_f
+
+#  function to convert hPa to inHg
+def hpa_to_inHg(hPa):
+    inches_mercury = hPa * 0.02953
+    return inches_mercury
+
+#  time.monotonic clock
+clock = 0
+#  units state
+us_units = False
+
+while True:
+    #  non-blocking 2 second delay
+    if (clock + 2) < time.monotonic():
+        #  map servo range to barometric pressure range
+        servo_value = simpleio.map_range(bmp280.pressure, 970, 1050, 180, 0)
+        #  set servo to pressure
+        gauge.angle = servo_value
+        #  print data for debugging
+        print("\nTemperature: %0.1f C" % bmp280.temperature)
+        print("Pressure: %0.1f hPa" % bmp280.pressure)
+        print(servo_value)
+        #  if not US units...
+        if not us_units:
+            #  update temp & pressure text in celcius and hPa
+            temp_data.text = "%0.1f ºC" % bmp280.temperature
+            press_data.text = "%0.1f hPa" % bmp280.pressure
+        #  if US units...
+        if us_units:
+            #  convert celcius to fahrenheit
+            temp_fahrenheit = c_to_f(bmp280.temperature)
+            #  convert hPa to inHg
+            pressure_inHg = hpa_to_inHg(bmp280.pressure)
+            #  update temp & pressure text
+            temp_data.text = "%0.1f ºF" % temp_fahrenheit
+            press_data.text = "%0.1f inHg" % pressure_inHg
+        #  reset time.monotonic() clock
+        clock = time.monotonic()
+    #  if a button is pressed, us_units is False, show imperial
+    if clue.button_a:
+        us_units = False
+    #  if b button is pressed, us_units is True, show US units
+    if clue.button_b:
+        us_units = True