AS7343: Tufty 2040 spectrometer example.

Author: Gadgetoid

micropython/examples/breakout_as7343/tufty_spectrometer.py

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+from picographics import PicoGraphics, DISPLAY_TUFTY_2040, PEN_P4
+from breakout_as7343 import BreakoutAS7343
+from pimoroni_i2c import PimoroniI2C
+
+
+display = PicoGraphics(DISPLAY_TUFTY_2040, pen_type=PEN_P4, rotate=90)
+
+WIDTH, HEIGHT = display.get_bounds()
+
+BLACK = display.create_pen(0, 0, 0)
+
+FZ = display.create_pen(0, 0, 128)
+FY = display.create_pen(0, 255, 0)
+FXL = display.create_pen(255, 128, 0)
+NIR = display.create_pen(128, 0, 0)
+F2 = display.create_pen(128, 0, 128)
+F3 = display.create_pen(0, 0, 255)
+F4 = display.create_pen(0, 128, 255)
+F6 = display.create_pen(128, 64, 0)
+
+F1 = display.create_pen(196, 0, 196)
+F5 = display.create_pen(64, 255, 64)
+F7 = display.create_pen(255, 0, 0)
+F8 = display.create_pen(196, 0, 0)
+
+WHITE = display.create_pen(255, 255, 255)
+
+i2c = PimoroniI2C(sda=4, scl=5)
+as7343 = BreakoutAS7343(i2c)
+
+as7343.set_channels(18)
+as7343.set_gain(1024)
+as7343.set_measurement_time(33)  # Roughly 30fps at 16ms/measurement
+as7343.set_integration_time(27800)
+
+as7343.set_illumination_current(4)
+as7343.set_illumination_led(True)
+
+
+BAR_WIDTH = 18
+BAR_SPACING = 4
+MARGIN = display.measure_text("NIR") + 2
+BAR_HEIGHT = WIDTH - MARGIN
+
+OFFSET_LEFT = int((HEIGHT - ((BAR_WIDTH + BAR_SPACING) * 12)) / 2)
+
+# Satrting max values for auto-ranging
+# From figure 8 of the datasheet
+MAX_VALUES = [
+    2711,
+    4684,
+    5970,
+    13226,
+    2371,
+    962,
+    3926,
+    4170,
+    7760,
+    1967,
+    6774,
+    1166
+]
+
+LABELS = [
+    "FZ",
+    "FY",
+    "FXL",
+    "NIR",
+    "F2",
+    "F3",
+    "F4",
+    "F6",
+    "F1",
+    "F5",
+    "F7",
+    "F8"
+]
+
+
+while True:
+    display.set_pen(0)
+    display.clear()
+    readings = as7343.read()
+    for i, reading in enumerate(readings):
+        MAX_VALUES[i] = max(reading, MAX_VALUES[i])
+        scaled = int(reading / MAX_VALUES[i] * BAR_HEIGHT)
+
+        y = i * (BAR_WIDTH + BAR_SPACING)
+        y += OFFSET_LEFT
+
+        display.set_pen(i + 1)
+        display.rectangle(MARGIN, y, scaled, BAR_WIDTH)
+
+        display.set_pen(WHITE)
+        display.text(LABELS[i], 0, y + 1)
+
+    display.update()