Observe Bluetooth advertisements for Govee H5075 and H5177 thermo-gygrometer and print out temperature, humidity, battery level

observe.py

import datetime
from time import sleep
from bleson import get_provider, Observer

def c2f(val):
    return round(32 + 9*val/5, 2)

last = {}

def temp_hum(values, battery, address):
    global last
    # print(values.hex())
    values = int.from_bytes(values, 'big')
    if address not in last or last[address] != values:
        last[address] = values
        temp = float(values / 10000)
        hum = float((values % 1000) / 10)
        print("{0} {1} Temp: {2} F  Humidity: {3} %  Battery: {4} %".format(datetime.datetime.now().isoformat(), address, c2f(temp), hum, battery))

def on_advertisement(advertisement):
    # print(dir(advertisement))
    # ['__bytes__', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__len__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_name', 'address', 'address_type', 'adv_itvl', 'appearance', 'flags', 'mfg_data', 'name', 'name_is_complete', 'public_tgt_addr', 'raw_data', 'rssi', 'service_data', 'svc_data_uuid128', 'svc_data_uuid16', 'svc_data_uuid32', 'tx_pwr_lvl', 'type', 'uri', 'uuid128s', 'uuid16s', 'uuid32s']

    mfg_data = advertisement.mfg_data
    if mfg_data is not None:
        # print(advertisement)
        if advertisement.name == 'GVH5177_9835':
            address = advertisement.address
            temp_hum(mfg_data[4:7], mfg_data[7], address)
        # elif mfg_data[0] == 0x88:
        elif advertisement.name == 'GVH5075_391D':
            address = advertisement.address
            temp_hum(mfg_data[3:6], mfg_data[6], address)
            # print(mfg_data.hex())

# device info
# Advertisement(flags=0x05, name='GVH5075_391D', txpower=None, uuid16s=[UUID16(0xec88)], uuid128s=[], rssi=-29, mfg_data=b'\x88\xec\x00\x03QOd\x00')
# Advertisement(flags=0x05, name='GVH5177_9835', txpower=None, uuid16s=[UUID16(0xec88)], uuid128s=[], rssi=-49, mfg_data=b'\x01\x00\x01\x01\x03l\xbfd')

adapter = get_provider().get_adapter()

observer = Observer(adapter)
observer.on_advertising_data = on_advertisement

observer.start()
while True:
    sleep(60)
observer.stop()

Tested on Raspberry Pi Zero W, Python 3.7.x

Script requires sudo. Maybe if I figure out which device its reading, I can flip the permission to avoid sudo.

Setup and run:

sudo apt install python3-pip
pip3 install bleson

sudo python3 observe.py

Hi @tchen,

I modified your script for use with a H5074... available here: https://gist.github.com/danricho/8cb2212cf8ed2d1e49903d118ec081b3.

Thanks for sharing your script!

@danricho nice!

Works perfect for my temp/humid sensor, thanks a lot.

To make it work for mine, which is called GVH5075_4FD9, I had to add it to the lower if statement. The data parses perfectly.

Hi @tchen I forked your gist and added support for the Govee H5102.
Thanks for your script.

By the way, on Linux if you use the setcap command as in the bleson instructions, https://bleson.readthedocs.io/en/latest/installing.html, then you do not need root permissions.

It also works nicely for my GVH5104_1F19, thanks a lot!

I have put my device into the freezer, bluetooth connection was still there.
Just the values returned didn't match the displayed values anymore, once going below 0 degC.

This has fixed the issue (I don't know much about python, it could be done in a better way probably):

        last[address] = values
        v1 = values & 0x7fffff
        temp = int( v1 / 1000 ) / 10.0
        if v1 != values: temp = -temp
        hum = float((v1 % 1000) / 10)

Hi @tchen I forked your gist and added support for the Govee H5102. Thanks for your script.

By the way, on Linux if you use the setcap command as in the bleson instructions, https://bleson.readthedocs.io/en/latest/installing.html, then you do not need root permissions.

@mukoan Thank you for the tip!