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atc1441 / ATC_MiThermometer

Custom firmware for the Xiaomi Thermometer LYWSD03MMC and Telink Flasher via USB to Serial converter
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Longer BLE range? #67

Open gabest11 opened 3 years ago

gabest11 commented 3 years ago

I found in the source that rf_set_power_level_index sets a fixed hard-coded value. According to this document, it corresponds to about 7.425 mA. It would be totally fine for me to increase this to the max (20 mA) and increase the interval between advertisments to 5 minutes or even longer, as it would be logged by home-assistant anyway. The question is, how much range could I gain by doing this? Is it worth it?

michapr commented 3 years ago

Don't forget that the device will send every x seconds anyway an advertising package so that it could be visible (used for scanning etc.) The provided "advertising time" here is only for advertising changed values in package.

So I think your battery could be empty fast...

BTW: what range do you need there?

atc1441 commented 3 years ago

An option would be to only set the TX power high every x minutes

Then it would not increase the drain a lot

gabest11 commented 3 years ago

I am trying to cover more sensors with a single esp32 in the house. The reception is lost over 10 meters or just in the next room. Uploaded a firmware into one with max strength and currently testing it.

gabest11 commented 3 years ago

It is either placebo or not working. I think it might reach a few meters further in the next room. But only detectable with my notebook, the esp thingy is too weak.

michapr commented 3 years ago

Try to use ESP32 with OpenMQTTGateway as sample - I have no problems at same floor, also from basement I receive data. (using ESP32 dev board)

JsBergbau commented 3 years ago

You could also try a Raspberry PI Zero W. This model has a very far bluetooth range.

marc-gist commented 3 years ago

You could also try a Raspberry PI Zero W. This model has a very far bluetooth range.

@JsBergbau have you done this? could you point me to a project/guide showing how to setup a PiZeroW with wifi and ble gateway to mqtt or HA?

michapr commented 3 years ago

@marc-gist you can use RPIEasy as sample. https://github.com/enesbcs/rpieasy

But with ESP32 and OpenMQTTGateway it is working also very well. https://github.com/1technophile/OpenMQTTGateway

JsBergbau commented 3 years ago

Hi @marc-gist,

you setup a RPI with RPI-OS, I recommend lite version for PI-Zero W. Just flash it to an SD Card, put the wpa_supplicant.conf into boot partition like described here https://www.raspberrypi.org/documentation/configuration/wireless/headless.md and add a file "ssh" without file extension. After that you boot your RPI-Zero W and can access it via Wifi without monitor and keyboard.

After that you install git by sudo apt install git and then you execute git clone https://github.com/JsBergbau/MiTemperature2 chmod +x *.sh chmod +x LYWSD03MMC.py Please look at the https://github.com/JsBergbau/MiTemperature2/blob/master/README.md of how to install the other requirements. After that you execute in the folder with ./LYWSD03MMC.py --atc --watchdogtimer 5 --callback sendToMQTT.sh You must adapt the sendToMQTT.sh for your needs, but it should be quite easy. Just read the https://github.com/JsBergbau/MiTemperature2/blob/master/README.md I hope that everything is well documentated.

With that script you can also enable "roaming" with multiple receivers.

elgatobavaria commented 1 year ago

An option would be to only set the TX power high every x minutes

Then it would not increase the drain a lot

Is it somehow possible with the custom firmware ?