PicoVector: Add vector spectrometer example for PicoW Explorer.

Author: Gadgetoid

micropython/examples/picow_explorer/vector_spectrometer.py

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+import math
+import time
+from pimoroni_i2c import PimoroniI2C
+from breakout_as7262 import BreakoutAS7262
+from picographics import PicoGraphics, DISPLAY_PICO_W_EXPLORER, PEN_RGB332
+from picovector import PicoVector, Polygon, RegularPolygon, ANTIALIAS_X4
+
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+i2c = PimoroniI2C(**PINS_PICO_EXPLORER)
+
+# Set up the AS7262 Spectrometer
+as7262 = BreakoutAS7262(i2c)
+as7262.set_gain(BreakoutAS7262.X16)
+as7262.set_measurement_mode(BreakoutAS7262.CONT_ROYGBR)
+as7262.set_illumination_current(BreakoutAS7262.MA12)
+as7262.set_indicator_current(BreakoutAS7262.MA4)
+as7262.set_leds(True, True)
+
+# Set up the display
+display = PicoGraphics(DISPLAY_PICO_W_EXPLORER, pen_type=PEN_RGB332)
+display.set_backlight(0.8)
+
+# Set up PicoVector
+vector = PicoVector(display)
+vector.set_antialiasing(ANTIALIAS_X4)
+
+# Load an Alright Font
+result = vector.set_font("/AdvRe.af", 30)
+
+WIDTH, HEIGHT = display.get_bounds()
+
+CENTER_X = int(WIDTH / 2)
+CENTER_Y = int(HEIGHT / 2)
+
+RADIUS = 90
+DEBUG = False
+
+RED = display.create_pen(255, 0, 0)
+ORANGE = display.create_pen(255, 128, 0)
+YELLOW = display.create_pen(255, 255, 0)
+GREEN = display.create_pen(0, 255, 0)
+BLUE = display.create_pen(0, 0, 255)
+VIOLET = display.create_pen(255, 0, 255)
+
+BLACK = display.create_pen(0, 0, 0)
+GREY = display.create_pen(128, 128, 128)
+WHITE = display.create_pen(255, 255, 255)
+
+LABELS = ["R", "O", "Y", "G", "B", "V"]
+COLS = [RED, ORANGE, YELLOW, GREEN, BLUE, VIOLET]
+
+
+# Custom regular_polygon function to give each point its own "radius"
+def regular_polygon(o_x, o_y, radius, rotation):
+    sides = 6
+    angle = math.radians(360 / sides)
+    rotation = math.radians(rotation)
+
+    points = []
+
+    for side in range(sides):
+        current_angle = side * angle + rotation
+        x = math.cos(current_angle) * radius[side]
+        y = math.sin(current_angle) * radius[side]
+        points.append((int(x) + o_x, int(y) + o_y))
+
+    return points
+
+
+lines = RegularPolygon(CENTER_X, CENTER_Y, 6, RADIUS)
+label_points = list(RegularPolygon(CENTER_X, CENTER_Y, 6, RADIUS * 0.7, -(360 / 12)))
+
+
+while True:
+    # Clear to black
+    display.set_pen(BLACK)
+    display.clear()
+
+    # Add the title
+    display.set_pen(WHITE)
+    vector.text("Spectrograph", 5, -5)
+
+    # Get the spectrometer readings
+    reading = list(as7262.read())
+
+    # Print out the readings
+    if DEBUG:
+        for i in range(6):
+            print(f"{LABELS[i]}: {reading[i]:0.2f}", end=" ")
+        print("")
+
+    # Draw the lines separating each section
+    display.set_pen(GREY)
+    for (x, y) in lines:
+        display.line(CENTER_X, CENTER_Y, int(x), int(y))
+
+    # Scale readings for display
+    for i in range(6):
+        reading[i] = int(reading[i] / 3.0)
+        reading[i] = min(reading[i], RADIUS)
+
+    # Create a 6 point polygon with each points distance from the center
+    # scaled by the corresponding reading.
+    points = regular_polygon(CENTER_X, CENTER_Y, reading, 0)
+
+    # Split the polygon into six triangles, one for each channel
+    # draw each one, along with its corresponding label
+    point_a = points[-1]
+    for i in range(6):
+        point_b = points[i]
+        label_x, label_y = label_points[i]
+        display.set_pen(COLS[i])
+        vector.text(LABELS[i], int(label_x) - 5, int(label_y) - 20)
+        vector.draw(Polygon(point_a, point_b, (CENTER_X, CENTER_Y)))
+        point_a = point_b
+
+    display.update()
+    time.sleep(1.0 / 60)