Is Enviro HAT working for you reliably?

Hi Victoria.

I'm going to guess that the problem may be the connections - maybe the jumper wires are not well connected to the PINs or some may be faulty ? I had problems before with loose jumper wires.

Can you test it by snap the two together ?

Mine is working fine without those reading swings.

Try and test both snapped to see.

Thank you Bruno.

When I initially tested it while it was snapped on the PI - the first issue definitely was happening. The one with 90% of humidity readings.

It will be hard to snap it on now to test the other 2 issues because I use a lot of other GPIO pins that Enviro HAT will cover if I snap it on the PI. I will really need to disassemble the whole setup.

Hi ilvyanyatka

I have the enviro hat connected with jumper wires and the sensor is behaving reasonable well

in My blog# 10 at this location    I describe my script to check the Humidity in the growing house.

lI recall the test retuning different readings for Humidity, but the screenshots only display 88%?

I display the Humidity over time in my chart HERE

I'm away from my project this week but I'll see if I'm getting the same values as you describe.

when I get a chance.

Regards

Steve

Thank you Steve!

What exactly is in your code for

value = RoomHumidity.getValue()

Do you use bme280 object to access Enviro sensor?  Something like

    bus = SMBus(1) 

   bme280 = BME280(i2c_dev=bus)

    AirHumidity = bme280.get_humidity()

Or do you use some other library/object?

Victoria

This may seem a dumb question, but have you tried with the Pimoroni's examples ?

Because - in their examples - the sensor sits on top of the Raspberry PI, they perform some calculations to remove the average cpu temperature to give a sort of accurate reading of the ambient temperature. and you don't have it that way.

Here's my code, a simple one to read the temperature/humidity (without giving in to cpu temperature):

import time
import sys

from bme280 import BME280


bme280 = BME280()


try:

    while True:
        # get data
        print ("Temp: {}".format(bme280.get_temperature()))
        print ("Hum: {}".format(bme280.get_humidity()))

        time.sleep(5)
except KeyboardInterrupt:
    sys.exit(0)

And a run of it for 60 seconds:

Temp: 22.631540955626406
Hum: 78.25451136740215
Temp: 31.840742193745086
Hum: 26.63692386637497
Temp: 31.831073930848675
Hum: 26.830281509600262
Temp: 31.831718481676603
Hum: 26.85365856716121
Temp: 31.834618960458556
Hum: 26.818467172909095
Temp: 31.838486265644406
Hum: 26.75399488327368
Temp: 31.834618960458556
Hum: 26.91790856236235
Temp: 31.83913081652463
Hum: 26.683776162340155
Temp: 31.834618960458556
Hum: 26.818467172909095
Temp: 31.825595248994887
Hum: 26.871405382322422
Temp: 31.832040757092273
Hum: 26.567011411920134
Temp: 31.829140278392174
Hum: 26.812795837825956

I have it on top of the RPI, so, the values are acceptable.

I really don't have the swings of values you describe.

Just try the code and see.

Yes, it is the exact code I am using.

I don't adjust temperature When Enviro was snapped on, the temperature reading was a couple of degrees higher. Now it seems to be accurate when humidity is around 30%. It starts returning wrong values when humidity is over 50%.

Thank you for your help. I guess my sensors are just a bit defective.

Hi ilvyanyatka

Thanks so much for checking out my blog.

To answer your question, the code in the script is using a Python Classes from sensors.py.

The code for this class can be viewed in my blog testing my classes at  Blog# 8.1 (Part 1 of 2) EAS - System Build

specifically at this location RoomHumidity class in the blog

I will eventually post my entire source code up to a Git Repository, soon.

I recall during testing, the script that checks the humidity, rose as the water in the glass container was running.

Hope this answers your initial question

Steve K

Thank you.

I use the same code to get the values.

I guess my sensor is just defective. I just don't see another explanation for such a big swing in values.