Estimated WBGT meter (25±3℃) for CircuitPython on Particle Xenon

code.py

import time
import board
import pulseio
from adafruit_motor import servo
from adafruit_dht import DHT11
from collections import namedtuple

StatusLED = namedtuple('StatusLED', ['r', 'g', 'b'])
led = StatusLED(
    pulseio.PWMOut(board.RGB_LED_RED, frequency=5000, duty_cycle=65535),
    pulseio.PWMOut(board.RGB_LED_GREEN, frequency=5000, duty_cycle=65535),
    pulseio.PWMOut(board.RGB_LED_BLUE, frequency=5000, duty_cycle=65535)
)


def setLED(r, g, b):
    led.r.duty_cycle = int((1.0 - r) * 65535)
    led.g.duty_cycle = int((1.0 - g) * 65535)
    led.b.duty_cycle = int((1.0 - b) * 65535)


pwm = pulseio.PWMOut(board.D2, frequency=50)
s = servo.Servo(pwm, min_pulse=500, max_pulse=2350)
s.fraction = 0.5

dhts = [DHT11(board.D12), DHT11(board.D11)]
failure = 0

setLED(0.1, 0, 0.1)
time.sleep(2)

while True:
    try:
        t1, h1 = dhts[0].temperature, dhts[0].humidity
        t2, h2 = dhts[1].temperature, dhts[1].humidity
        t, h = (t1 + t2) / 2, h = (h1 + h2) / 2

        # https://www.wbgt.env.go.jp/pdf/ic_rma/2301/mat05_3.pdf
        wbgt = c.wbgt = 0.85 * t + 0.14 * h - 6.15

        center = 25
        rng = 3
        r = min(max((center - wbgt) / rng, -1.0), 1.0) * 0.5 + 0.5

        print("%f %f %f %f %f %f" % (t1, h1, t2, h2, wbgt, r))
        setLED(0, 0, 0.1)
        s.fraction = r
        time.sleep(1)
        s.fraction = None
        setLED(0, 0.05, 0.05)
        time.sleep(59)

        failure = 0
    except Exception as e:
        print(e)
        failure += 1
        if failure >= 10:
            print("Something is wrong. Reboot recommended")
            setLED(0.1, 0, 0)
            time.sleep(5)
        else:
            setLED(0.1, 0.1, 0)
            time.sleep(3)