HelloI 'm just trying to see what is the best solution for a upcoming project after the holidays. I did a lot of research online But I'm unsure of which device to pick, Use or Buy. So here is my research to Sum it all up.
I went and looked some for xbee information on range and found there are a few out there but the information i got for range and power is
XBee Pro 60mW onboard Antenna can get 1 Mile XBee Pro 60mW sma antenna Connection can get 1 to 2 Miles about XBee Pro 900 RPSMA can get ranges up to 6 Miles But the cost is out of this roof
The second thing i looked at was 433mhz and 315mhx stuff. The first thing there are all over the place for power and ranges but i was only really looking for long range devices and came across one site from seeedstufio that said it can get 2KM Long Range 433mhz RF So i looked at the site and from what I'm seeing I do not see how it can get a 2km which is 1.2miles range. by the small coil antennas on the devices it looks like the same that i use around my test with a keyfob on them and they only go up to like 30 maybe 40 feet the most. This is the link Here .
The next thing i seen is that the xbee use a 915mhz freq Which i thought that was for Cellphone use and what i found out here in the us it's not it's a ism band which is used for industrial, scientific and medical (ISM) radio bands. Meaning in hospitals and commercial applications also can be used for other things like arduinos as well as the pi. But anyhow what i did was found some 915mhz stuff that can range from 1000ft to 1700ft thought buildings and outdoors also line of site can be over 3500 feet or more. But still debating If can really use 915mhz freq.
So which bring me to my next thing the NRF24L01+ modules which is have tested them out and got between 500ft to 1700ft range depending on the building i have tested in houses as well as warehouses for storing stuff. Also out door line of sight i got almost 12 city blocks which are pretty long but i didn't tell how far i was because i couldn't see my brother he was that far away and in a building But i have got it tested at 38% with a few packet losses but still mange to get a signal. I'm also surprised it uses a 2.4ghz freq for these NRF24L01+ modules.
The last thing i was looking into was just using wifi modules and shields for this project and i thought a few things good and bad one of them is the ESP8266 wifi module which can be used by its self or with a arduino and i was happy about it. But a few downsides to this module is that the range is low and you will have to be connected to a router to get online to send the data. As well If the internet connector or router went down can broadcast nothing. But one good feat it dose have on this module it can be a standalone module which means it can be its own router and access point to broadcast the information. But a downside to this is that the range is limited to about 30 to 50 ft.
All these devices have a great pros and cons on them. One thing I have to do is worry about Cost wise to range as well as power.. Sense I'm looking for the cheapest one with the longest range no matter if indoors or outdoors and even if one is in door and the other is outdoors. If there is any other device out there that i can use with arduino that will give me the best long range and doesn't cost a arm and a leg Please let me know i would love to find it. Also if any of my information is wrong please let me know Thank you.