I am building a prototype with temperature and humidity sensors for rural areas and I am trying to determine which is the best way to gather data, since Internet may not be available (no WiFi).
I am thinking about radio frequencies, Bluetooth or maybe a GSM module to send data through SMS. It has to be also cheap.
I am wondering if I could get some recommendations from this community.
Warm Regards, Carlos
Are you talking about a continuous stream of data? Or data polling?
The easiest and cheapest of them all is always to save the data to a USB key and collect the USB sticks on a daily basis (or weekly).
If you want remote monitoring, that won’t work of course.
I’ve played with SMS a bit, using Twilio
As for cellular connection, the only one I’m a bit familiar with is the Electron: https://www.particle.io/products/hardware/electron-cellular-dev-kit
Eons ago I was able to make a radio connected network but this takes a license (which I do have but you may or may not)
PS. Sounds like a great project that you’re working on!
I need to pull information every 3 hours.
I guess USB could work for the pilot project, but it could grow really fast, I am aiming to set 1,700 stations in 4 years therefore USB would be too costly. The best way would be any method that allows me to retrieve info from distance (I would say minimum 500 meters)
I am not very knowledgeable in this area, others here do know more, but I’m the one who’s online right now.
I believe wifi would be your best answer. Google “long range wifi” for many products and projects that have been implemented. One project covered over 400 km with only 17 hops !
A quick search gave me this product which claims 1.5 mile range. I do not have any experience with it though.
I guess I will try SMS, 433 Mhz transmitter and Wi-Fi and see which one is cheaper in one month.
Thanks so much for the advice.
I will post the results when I have them.
Warm regards from Costa Rica.
if you need help, I’m always looking for an excuse to finally visit Costa Rica.
Hahahahahaha, I will let you know how the test goes, if we are able to pull it off we will need all the help we can get.