How to Read,Text, Set Temperature Wireless Multible Devices

Other Hardware Sensors
1

Hello People,

I make research on the internet to buy a devices (multiple sensors that connect to a device) that will measure the temperature wireless and save the data to a data server and text me when the temperature get over the measures that I want, but nothing!! So I am very interested in creating my own hardware and I find out that the arduino can do it. Finally have a place to put my ideas down and talk with pro people in an area I would like to grow stronger in.

I will jump straight to the point.
I have 20 big fridges what I would like to do is: to have the main device that is connect to internet (ethernet or wireless), also GSM module in case the temperature of one fridge goes up to the level to text (ALARM) me that the temperature of the frigde is HI and 20 wireless thermometers sensors that will connect to the main device.

From the research I have done it seems to me that I will need an Arduino but there so many modules and difficult for me to choose. So my first question is what board and modules would be best to complete this task?

I appreciate your time in reading this and any assistance you may provide me in accomplishing my goal

Thanks,

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Arduino Mega has 16 analog inputs. They could work with simple thermistors (which you have to calibrate yourself). If you need 20, either add another Arduino or switch to more expensive digital thermosensors, which might have some adressable serial communication with a single Arduino Uno (or any Arduino).

Nothing works wirelessly. It's only a question about how long wire link you can accept and what are you willing to connect to that wire. I guess that rather than having just one matchbox size module (placed in the fridge) which takes care of the connection to your phone, you could have the single sensor inside the fridge, some wires coming out, connected to a microcontroller. And from that microcontroller it would be wireless to either Internet or the GSM net, through a suitable module.

Or if the microcontroller would be a MKRFOX1200, it would be connected to the SigFox network without external modules. One MKRFOX1200 has 7 analog inputs, so three of them would cover your 20 fridges.

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Johan_Ha:
Nothing works wirelessly.

Not wireless for the sensors I hope.

I get the impression that he wants to have the Arduino text him which is doable.

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