Wanted WiFi thermometer with data dump to server and sleep mode

Question

Hello I am looking for a thermometer that: - connects to a defined wifi network - dumps the measurement result to a defined server available on that wifi network from time to time - goes to sleep to save battery life. I don't want something that connects 'to the cloud'. - this has to work...

TvWidget · Accepted Answer

As an estimate, it can be assumed that data can be sent to the server in 30 sec. This means that 1mAh will be consumed per upload. If I am counting correctly this will give a monthly consumption of around 1.5Ah. If you accept changing the battery once a month then go for WiFi thermometers. If not then energy efficient wireless thermometers and a WiFi gateway with mains power will be the solution.

TvWidget · Answer

WiFi communication is not very suitable for battery-powered devices. Even if connecting occasionally, the battery has to be large to ensure adequate current capacity. Running the radio interface in the ESP requires a current of the order of 100mA(_at_)3.3V. In comparison, thermometers with a BLE interface require several thousand times less energy to operate. They can therefore be powered by a small CR2032 battery for many months. Solutions consisting of battery-operated BLE thermometers and a gateway e.g. on ESP32 with mains power supply are often used.

Anonymous · Answer

Thanks for the tip. Of course it doesn't have to be Wi-Fi. And are there any solutions with a range of tens of metres in a building? .

TvWidget · Answer

If the signal is to pass through the walls of a building, it is advisable to use thermometers operating in the 868MHz range. With this solution, there may be formal limitations with too frequent sending of measurements.
Do you need one thermometer or are you looking for a larger scale solution?

Anonymous · Answer

In the simplest terms - I need to place several thermometers in different areas of the building and have the results of the measurements stored in the computer for viewing / doing statistics. A one-off solution.

TvWidget · Answer

How often are the temperature measurements to be taken ?
What measurement range and accuracy is required ?
Is WiFi available at those locations where the thermometers will be ?
There are also thermometers with archiving. You can approach them and read out historical data with a smartphone. Is this solution acceptable ?

Anonymous · Answer

Once every half hour is enough
The range and precision of a simple DS1820 is sufficient. Positive temperatures (heated/heated building), one unit outside
Wifi is.
I would prefer an automatic.

Are there any weather stations with external sensors to which one can connect via RS/USB/Wifi ? This would also be suitable.

hindoos · Answer

Ecowitt makes thermometers for the frequency of your choice as well as WiFi gateways that work with them so you can collect this data. It is not cheap but it is practically a ready-made solution and supports many thermometers

Anonymous · Answer

Thanks - something with a Wi-Fi gateway will be a suitable solution. I see that this Ecowitt has such a thing on offer.

Wanted WiFi thermometer with data dump to server and sleep mode

How can I set up battery-powered thermometers that send temperature readings to a local server on my LAN without using the cloud?

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