Temperature sensor with GSM module?

Question

SMS

We need a temperature sensor that, when the temperature drops below the specified level, would inform me about this by SMS. Please advise.

Answer 1

You can make such a device yourself without even having special skills - Arduino (from $9) + Temperature sensor (DS18B20 ~ $2) or humidity and temperature sensor (DHT22 ~ $10) + the most expensive GSM Shield component (from $60). Here is a description of how a person did such a thing labs.vectorform.com/2011/10/remote-temperature-monitoring-with-the-arduino-sm5100b/. You can easily hang not one, but several such sensors on the Arduino, they work via a 1-wire interface, that is, two wires are enough, the sensors can be placed at a distance from each other, you can monitor temperature, humidity, screw PIR motion sensors, etc. The most expensive component - GSM Shield can be replaced with an old phone controlled by UART.

Answer 2

It all depends on what exactly you need and now have ...
Sensor + phone or Internet + computer.
Or, for example, they promoted Twine on Habré.
habrahabr.ru/blogs/wireless/133421/

Answer 3

I solved a more extended problem - habrahabr.ru/post/153719/ Maybe you will find useful ideas for yourself.
And if a single solution is “for yourself”, then Arduino + DS18B20 + old Siemens phone (or any GSM module with minimal wiring).