import math
from cs1237 import CS1237
from machine import Pin

clock = Pin(2)
data = Pin(4)

ADC_RATE = 40

cs1237 = CS1237(clock, data)
cs1237.config(gain=1, rate=ADC_RATE)

print(repr(cs1237.get_config()))

THERMISTOR_BETA = 3950.0
THERMISTOR_R25 = 10e3

THERMISTOR_RINF = THERMISTOR_R25 * math.exp(-THERMISTOR_BETA / 298.15)

# Filter constant in seconds
FILTER_RC = 1
FILTER_A = 1 / ADC_RATE / (FILTER_RC / 1 / ADC_RATE)

temperature_filtered = 25
while True:
    raw_value = cs1237.read()
    value = float(raw_value) / (2**24 - 1)

    if value > 0.9999:
        value = 0
    else:
        value = 10e3 * 1 / (1 / value - 1)

    temperature = THERMISTOR_BETA / math.log(value / THERMISTOR_RINF) - 273.15

    temperature_filtered = (
        temperature_filtered * (1 - FILTER_A) + temperature * FILTER_A
    )

    print(temperature_filtered)