Not sure if this would be something you'd be interested in. They have some LORA boards on a Kickstarter
https://www.kickstarter.com/projects/pisupply/iot-lora-boards-your-gateway-to-the-internet-of-th ~Carl On Thu, Oct 25, 2018 at 5:18 PM Tadd Torborg via TriEmbed < [email protected]> wrote: > Hmm.. I pasted this to the wrong stream I think. Sorry if this is a > duplication > > I would suggest using a 900Mhz base station someplace on the property > where there is an RF view to the rest of the property. You are allowed 1 > watt with a frequency hopping system. Then use stations in the robots and > wherever your control system is, all within almost line-of-site with your > base station. You can get 100kbits/sec shared bandwidth. you’d have your > base station set up as a channel control device offering up time-slots to > your mobile assets and the control station. If you had 2 robots you’d > probably end up with 2000 or 3000 bytes per second per robot, split between > robot transmissions and robot receptions. > Part 15.247 FCC rules I think. > > no cost for operation. > > This isn’t going to work for full motion video but snapshots should be > possible and you can do reasonably high speed navigation with GPS, sonar > ranges and Remote Control motor management in real time with this kind of > system. > > Vendors: > Search the web for 900mhz spread spectrum radio” You’re looking for > 15.247 I think if you need to narrow the search. > > This can be in-house manufactured too depending on your volume. There are > plenty of single chip 900 radios. Many of the LoRa radios can be used in > FSK mode for this but you’ll need a PA to get the range you need I think. > In the short run you can do in-house testing with bare modules based on the > SemTech 900 radio-on-a-chip if you want to go it from scratch. > > FHSS rules are that you can stay on one frequency for up to 400mS, you > generate your own transmit sequence and apply it in every device. You have > to hop through 25 or more frequencies. You can repeat every 20 seconds. > The base station would send some synchronization info every time it ends up > on your hop sequence channel 0 or something like that. Any device which > has lost the FHSS sequence index would camp out on channel 0 until it hears > the base station send out the synchronization info. > > Tadd > > > Tadd / KA2DEW > [email protected] > Raleigh NC FM05pv > > *“Packet networking over ham radio": > **http://tarpn.net/t/packet_radio_networking.html > <http://tarpn.net/t/packet_radio_networking.html>* > *Local Raleigh ham radio info: **http://torborg.com/a > <http://torborg.com/a> * > > On Oct 25, 2018, at 3:23 PM, Charles West via TriEmbed < > [email protected]> wrote: > > Hello! > > I'm in Lansdale, PA now but I was hoping I might be able to pick you guy's > brains. My current big project is trying to build one or more robots to > deliver food/drinks on golf courses. I'm currently trying to figure out > the best way to maintain continuous(ish) contact between a access > point/basestation at it's base of operations and 1 or more robots operating > on the course. > > At a minimum, I would like to have the robot report its basic status > (battery percent, GPS position) but it would also be great if it could > stream video when required to allow teleprescence steering or determination > of what is going on. The robot would probably be about 1 km from the base > station at max. > > I'm currently considering 3 possible solutions but I'm pretty open to > ideas: > > 1. Use a mobile hotspot/cell modem: > For fixed $130 and monthly $20, I can get a mobile hotspot which > provides one gig of data per month and more data for $5/gig. If I keep the > reporting really light, this could work but the communication would have to > be kept pretty limited. > > 2. XBee: > These modules seem to float somewhere between $25 and $60 in > prices, so a pair would be somewhere in the $50 to $120 range. Sparkfun > had a good guide to XBee (https://www.sparkfun.com/pages/xbee_guide) but > they are listing almost all of their products as retired (besides old > series 1) and most of the stuff I read about XBee is from 2015-2016 so I am > not sure what the best options are anymore. In any case, it looks like it > would provide a low baud rate connection over the desired range. The main > problem is that it requires working through XBee and making my basestation > have to have special software to forward information. I'm also not sure > about security and it is certainly not going to be streaming video. > > 3. Long range Wifi: > Rodney's done some work in this area before with his weather > balloon projects. I don't recall off the top of my head how far he managed > to get but I do remember he had to use higher power than allowed without a > higher grade amateur radio license. That power level would not work for a > commercial operation. There are some companies that are selling solutions > aimed at farms (http://ayrstone.com/www/?v=7516fd43adaa) and there seem > to be off the shelf solutions that can get 500 ft (mostly aimed at > hotels). The hotel systems seem to be in the $350 range and the farm > systems in the $500 or so. The robot could use a high gain antenna, but it > is not clear how much it helps. These systems have security built in and > potentially can stream video if the range is long enough. Like hotspots, > writing software for them would also be easy. > > What do you guys think? > > Thanks, > Charlie > _______________________________________________ > Triangle, NC Embedded Computing mailing list > > To post message: [email protected] > List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org > TriEmbed web site: http://TriEmbed.org > To unsubscribe, click link and send a blank message: > mailto:[email protected]?subject=unsubscribe > <[email protected]?subject=unsubscribe> > > > _______________________________________________ > Triangle, NC Embedded Computing mailing list > > To post message: [email protected] > List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org > TriEmbed web site: http://TriEmbed.org > To unsubscribe, click link and send a blank message: mailto: > [email protected]?subject=unsubscribe > > -- ------------------------------------------------------------------------------- Carl J. Nobile (Software Engineer) [email protected] -------------------------------------------------------------------------------
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