Python code

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import time

from adafruit_circuitplayground import cp

# Set values based on the user’s ambient temperature measured in degrees Celsius.
temperature_min = 20
temperature_max = 40

# Loop forever
while True:
    scale = round(10 * (cp.temperature - temperature_min) / (temperature_max - temperature_min))

    # Get through NeoPixels #0 to #9.
    for p in range(10):
        if p < scale:
            cp.pixels[p] = (255, 255, 255) # (Turn on the NeoPixel.)
        else:
            cp.pixels[p] = (0, 0, 0) # (Turn off the NeoPixel.)

    # Depending on the switch, write to
    # * the serial console (if True, i.e. left), or to
    # * the CircuitPython storage (if False, i.e. right).
    if cp.switch:
        print("Temperature is", "{:.2f}".format(cp.temperature), "°C scaled to", scale, "in [", temperature_min, "°C,", temperature_max, "°C ]")
        print( (cp.temperature, scale, temperature_min, temperature_max) )
    else:
        f = open("temperature.csv", "a")
        f.write(repr(cp.temperature) + "," + repr(scale) + "," + repr(temperature_min) + "," + repr(temperature_max) + "\n")
        f.close()

    # Sleep 1 second to slow down the readings.
    time.sleep(1)

import storage

from adafruit_circuitplayground import cp

storage.remount("/", readonly=cp.switch)