Examples: adding sensor-stick-temperature.py

Author: thirdr

examples/sensor-stick-temperature.py

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+# ICON [[(-20.0, 16.67), (-20.0, 12.22), (-15.56, 7.78), (-15.56, 16.67), (-20.0, 16.67)], [(-11.11, 16.67), (-11.11, 3.33), (-6.67, -1.11), (-6.67, 16.67), (-11.11, 16.67)], [(-2.22, 16.67), (-2.22, -1.11), (2.22, 3.39), (2.22, 16.67), (-2.22, 16.67)], [(6.67, 16.67), (6.67, 3.39), (11.11, -1.06), (11.11, 16.67), (6.67, 16.67)], [(15.56, 16.67), (15.56, -5.56), (20.0, -10.0), (20.0, 16.67), (15.56, 16.67)], [(-20.0, 5.17), (-20.0, -1.11), (-4.44, -16.67), (4.44, -7.78), (20.0, -23.33), (20.0, -17.06), (4.44, -1.5), (-4.44, -10.39), (-20.0, 5.17)]]
+# NAME Temperature
+# DESC Display data from your Multi Sensor Stick!
+
+from presto import Presto
+from breakout_bme280 import BreakoutBME280
+from picovector import ANTIALIAS_BEST, PicoVector, Polygon, Transform
+import machine
+
+# Setup for the i2c and bme sensor
+bme = BreakoutBME280(machine.I2C())
+
+# Setup for the Presto display
+presto = Presto(ambient_light=True)
+display = presto.display
+WIDTH, HEIGHT = display.get_bounds()
+
+CX = WIDTH // 2
+CY = HEIGHT // 2
+
+# Colours
+BLACK = display.create_pen(0, 0, 0)
+hue = 0.05
+BACKGROUND = display.create_pen_hsv(hue, 0.8, 1.0)  # We'll use this one for the background.
+FOREGROUND = display.create_pen_hsv(hue, 0.5, 1.0)  # Slightly lighter for foreground elements.
+TEXT_COLOUR = display.create_pen_hsv(hue, 0.2, 1.0)
+
+# Pico Vector
+vector = PicoVector(display)
+vector.set_antialiasing(ANTIALIAS_BEST)
+t = Transform()
+
+vector.set_font("Roboto-Medium.af", 96)
+vector.set_font_letter_spacing(100)
+vector.set_font_word_spacing(100)
+vector.set_transform(t)
+
+
+class Widget(object):
+    def __init__(self, x, y, w, h, radius=10, text_size=42):
+        self.x = x
+        self.y = y
+        self.w = w
+        self.h = h
+        self.r = radius
+        self.text = None
+        self.size = text_size
+        self.title = None
+
+        self.widget = Polygon()
+        self.widget.rectangle(self.x, self.y, self.w, self.h, (self.r, self.r, self.r, self.r))
+
+    def draw(self):
+
+        display.set_pen(FOREGROUND)
+        vector.draw(self.widget)
+
+        if self.text:
+            display.set_pen(TEXT_COLOUR)
+            vector.set_font_size(self.size)
+            x, y, w, h = vector.measure_text(self.text)
+            tx = int((self.x + self.w // 2) - (w // 2))
+            ty = int((self.y + self.h // 2) + (h // 2)) + 5
+            vector.text(self.text, tx, ty)
+
+        if self.title:
+            display.set_pen(TEXT_COLOUR)
+            vector.set_font_size(14)
+            x, y, w, h = vector.measure_text(self.title)
+            tx = int((self.x + self.w // 2) - (w // 2))
+            ty = self.y + 15
+            vector.text(self.title, tx, ty)
+
+    def set_label(self, text):
+        self.text = text
+
+    def set_title(self, title):
+        self.title = title
+
+
+# We'll use a rect with rounded corners for the background.
+background_rect = Polygon()
+background_rect.rectangle(0, 0, WIDTH, HEIGHT, (10, 10, 10, 10))
+
+widgets = [
+    Widget(10, 7, WIDTH - 20, HEIGHT // 2 - 5, 10, 82),  # Temperature
+    Widget(10, CY + 10, (WIDTH // 2) - 15, HEIGHT // 2 - 17, 10, 26),  # Pressure
+    Widget(CX + 5, CY + 10, (WIDTH // 2) - 15, HEIGHT // 2 - 17, 10, 52)  # Humidity
+]
+
+
+widgets[0].set_title("Temperature")
+widgets[1].set_title("Pressure")
+widgets[2].set_title("Humidity")
+
+while True:
+
+    # Clear screen and draw our background rectangle
+    display.set_pen(BLACK)
+    display.clear()
+    display.set_pen(BACKGROUND)
+    vector.draw(background_rect)
+
+    # Get readings and format strings
+    reading = bme.read()
+    temp_string = f"{reading[0]:.1f}C"
+    pressure_string = f"{reading[1] // 100:.0f} hPa"
+    humidity_string = f"{reading[2]:.0f}%"
+
+    # Update the widget labels
+    widgets[0].set_label(temp_string)
+    widgets[1].set_label(pressure_string)
+    widgets[2].set_label(humidity_string)
+
+    # Draw all of our widgets to the display
+    for w in widgets:
+        w.draw()
+
+    # Update the screen so we can see our changes
+    presto.update()