Wireless Barometric Pressure Device

[Wayne]

Are there any recommendations for a wireless (900 MHz preferably) barometric pressure transducer? The application is when using the weewx-rtldavis driver to capture data from the Davis Integrated Sensor Suite. Since the pressure sensor for the Vantage Vue/PRO2 products is part of the Davis console device and is not broadcast wirelessly, from where are SDR weewx users getting their barometric pressure data?

I understand the Davis Envoy includes a pressure sensor but I prefer to spend less than $200.

Wayne

[vince]

Not wireless but an inexpensive bme280 connected to a raspi and the bme280wx extension works fine.  https://github.com/vinceskahan/weewx-bme280-howto is how I set mine up when I was fiddling with that stuff.  The sensor I bought was $16 at Amazon in the spring.

Alternate solution might be an ecowitt gw1000 or 1100 or 1200 gateway device with Gary's gw1000 driver running as an extension to query it periodically if you are ok with the gateway occasionally phoning home to China.  I put mine on a separate VLAN from the weewx system.   A gateway is around $30 or so typically.

[Jimi Lawson]

When my old Maplin station console failed last year I setup weexw on a RPi 3B using SDR to get the outdorr sensor signals,  I did the same as Vince and used a "Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor" to get pressure, indoor temp & humidty. Trouble free for nearly 18 months now.

[Wayne]

Did not know about the BME sensor! Looks like a great solution. Inexpensive, too. Many thanks.

Wayne

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[michael.k...@gmx.at]

The indoor Humi/Temp/Baro Sensor from Ecowitt is available for 915MHz. https://shop.ecowitt.com/collections/temp-humidity-sensor/products/wh32-indoor

The mentioned BME280 is also great for measuring pressure (but not so good for Humi/Temp).

[Jimi Lawson]

Over the last 18 months my BME 280 Pressure/ temp/ humidty readings have pretty much agreed with my stand alone monitor (which I positioned next to the BME for the first few months as a check)

Jimi

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[michael.k...@gmx.at]

@Jimi: this is depending on the environment the bme280 is working. The data sheet mentions that the operation range is only for non-condensing environments. If you run your BME280 indoors, you're most likely fine. I ran some of them outdoors, in very humid conditions, especially below freezing point, the BME280 is just not the right sensor to use.

[Jimi Lawson]

I quite agree, if I'd been intending to use it outside I wouldn't have picked the BME280 (outdoors in Scotland isn't what you would describe as a non-condensing environment 😉) It would have been too much trouble to protect it against the weather and would have needed either a long cable or moving the RPi outside, neither of which are particularly practical in my situation, I'd have looked for an outdoor wireless solution instead.

But as a replacement for the pressure, indoor temp & humidity data from an dead indoor console,  it's ideal I.M.O. It's positioned where the console used to be, 18" from the RPi that weewx runs on, so all the data from it is from the same environment as the last 12 years and so far the data from it has been quite consistent with the previous data.

Jimi

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