bluey-beacon - parse sensor data

bluey-beacon-3.py

# constant
pow_16 = 65536.0

# decode temperature
def decodeT(temp_val):
    return ((temp_val / pow_16) * 165 - 40)

# decode humidity
def decodeH(humid_val):
    return ((humid_val / pow_16) * 100)

# decode ambient light
def decodeL(adc_ch0, adc_ch1):
    result = 999.99
    channelRatio = (adc_ch1)/(float)(adc_ch0);
    # below formula is from datasheet
    if(channelRatio >= 0 and channelRatio <= 0.52):
        result = (0.0315 * adc_ch0) - (0.0593 * adc_ch0 * pow(channelRatio, 1.4))
    elif(channelRatio > 0.52 and channelRatio <= 0.65):
        result = (0.0229 * adc_ch0) - (0.0291 * adc_ch1)
    elif(channelRatio > 0.65 and channelRatio <= 0.80):
        result = (0.0157 * adc_ch0) - (0.0180 * adc_ch1)
    elif(channelRatio > 0.80 and channelRatio <= 1.30):
        result = (0.00338 * adc_ch0) - (0.00260 * adc_ch1)
    elif(channelRatio > 1.30):
        result = 0;
    return result

# decode T/H/L data
def decodeData(x1, x2, x3, x4):
    T = decodeT(x1)
    H = decodeH(x2)
    L = decodeL(x3, x4)
    return (T, H, L)