Add adjust_to_sea_pressure function
Now describe_pressure() gives meaningful insights if you set the altitude
@@ -22,6 +22,9 @@ TEMPERATURE_OFFSET = 3
BRIGHTNESS = 0.8
+# change this to adjust pressure based on your altitude
+altitude = 0
+
# light the LED red if the gas reading is less than 50%
GAS_ALERT = 0.5
@@ -46,6 +49,18 @@ def graphic_equaliser():
led.set_rgb(0, ms, 0)
+def adjust_to_sea_pressure(pressure_hpa, temperature, altitude):
+ """
+ Adjust pressure based on your altitude.
+
+ credits to @cubapp https://gist.github.com/cubapp/23dd4e91814a995b8ff06f406679abcf
+ """
+
+ # Adjusted-to-the-sea barometric pressure
+ adjusted_hpa = pressure_hpa + ((pressure_hpa * 9.80665 * altitude) / (287 * (273 + temperature + (altitude / 400))))
+ return adjusted_hpa
+
+
def describe_pressure(pressure_hpa):
"""Convert pressure into barometer-type description."""
if pressure_hpa < 970:
@@ -213,6 +228,9 @@ while True:
# convert pressure into hpa
pressure_hpa = pressure / 100
+ # correct pressure
+ pressure_hpa = adjust_to_sea_pressure(pressure_hpa, corrected_temperature, altitude)
+
# read LTR559
ltr_reading = ltr.get_reading()
lux = ltr_reading[BreakoutLTR559.LUX]
