<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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. <div class="">Part 15.247 FCC rules I think.</div><div class="">Campbell Scientific RF401A . There was a Microwave Data Systems of Rochester that made equipment for this. </div><div class="">Can be in-house manufactured too depending on your volume. </div><div class=""><br class=""></div><div class=""> Tadd</div><div class=""><br class=""></div><div class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Tadd / KA2DEW<br class=""><a href="mailto:tadd@mac.com" class="">tadd@mac.com</a><br class="">Raleigh NC FM05pv<br class=""><br class=""><b class="">“Packet networking over ham radio": </b><b class=""><font color="#0056d6" class=""><a href="http://tarpn.net/t/packet_radio_networking.html" class="">http://tarpn.net/t/packet_radio_networking.html</a></font></b><br class=""><b class="">Local Raleigh ham radio info: </b><b class=""><font color="#0056d6" class=""><a href="http://torborg.com/a" class="">http://torborg.com/a</a> <span class="Apple-converted-space"> </span></font></b><br class=""></div></div></div></div></div>
</div>
<div><br class=""><blockquote type="cite" class=""><div class="">On Oct 25, 2018, at 3:56 PM, Chip McClelland via TriEmbed <<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<title class=""></title>
<div class="">
<div name="messageBodySection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;" class="">Charles,
<div class=""><br class=""></div>
<div class="">I am working on a project for a CA client who wants to use LoRa. It is not able to send video but is very energy efficient and has range that could easily cover a golf course from a single gateway at the clubhouse. </div>
<div class=""><br class=""></div>
<div class="">Depending on where you are, you may also be able to use a LoRaWAN service which has a service provider, I am using MachineQ from Comcast. </div>
<div class=""><br class=""></div>
<div class="">It uses the same Low Power Labs RMS69W radios at 915MHz. Hope this helps.</div>
<div class=""><br class=""></div>
<div class="">Chip</div>
<div class=""><br class=""></div>
<div class=""><br class=""></div>
</div>
<div name="messageSignatureSection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;" class=""><br class="">
<span style="caret-color: rgb(45, 48, 51); color: rgb(45, 48, 51); font-family: -apple-system; font-size: 16px; background-color: rgb(255, 255, 255);" class="">Chip McClelland</span>
<div style="font-family: -apple-system; margin: 0px; padding: 0px; border: 0px; font-size: 16px; font-stretch: inherit; line-height: inherit; vertical-align: baseline; caret-color: rgb(45, 48, 51); color: rgb(45, 48, 51);" class=""><a href="mailto:chip@mcclellands.org" class="">chip@mcclellands.org</a></div>
<div style="font-family: -apple-system; margin: 0px; padding: 0px; border: 0px; font-size: 16px; font-stretch: inherit; line-height: inherit; vertical-align: baseline; caret-color: rgb(45, 48, 51); color: rgb(45, 48, 51);" class="">(919) 624-5562</div>
</div>
<div name="messageReplySection" style="font-size: 14px; font-family: -apple-system, BlinkMacSystemFont, sans-serif;" class="">On Oct 25, 2018, 3:43 PM -0400, <a href="mailto:triembed-request@triembed.org" class="">triembed-request@triembed.org</a>, wrote:<br class="">
<blockquote type="cite" style="margin: 5px 5px; padding-left: 10px; border-left: thin solid #1abc9c;" class="">Send TriEmbed mailing list submissions to<br class="">
<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a><br class="">
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To subscribe or unsubscribe via the World Wide Web, visit<br class="">
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or, via email, send a message with subject or body 'help' to<br class="">
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When replying, please edit your Subject line so it is more specific<br class="">
than "Re: Contents of TriEmbed digest..."<br class="">
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<br class="">
Today's Topics:<br class="">
<br class="">
1. Re: Coffee roaster (Shane Trent)<br class="">
2. Long range digital communication (long range wifi, XBee?)<br class="">
(Charles West)<br class="">
3. Re: Long range digital communication (long range wifi, XBee?)<br class="">
(Glen Smith)<br class="">
<br class="">
<br class="">
----------------------------------------------------------------------<br class="">
<br class="">
Message: 1<br class="">
Date: Thu, 25 Oct 2018 14:32:25 -0400<br class="">
From: Shane Trent <<a href="mailto:shanedtrent@gmail.com" class="">shanedtrent@gmail.com</a>><br class="">
To: TriEmbed Discussion <<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a>><br class="">
Subject: Re: [TriEmbed] Coffee roaster<br class="">
Message-ID:<br class="">
<<a href="mailto:CAAFjd3raX35XcbvJtf8uVF6aYrircZsAuVpUtHhHX4KQzu+BVg@mail.gmail.com" class="">CAAFjd3raX35XcbvJtf8uVF6aYrircZsAuVpUtHhHX4KQzu+BVg@mail.gmail.com</a>><br class="">
Content-Type: text/plain; charset="utf-8"<br class="">
<br class="">
Craig,<br class="">
<br class="">
A hot air roast should take much less than 30 minutes. It was cool this<br class="">
morning and I roasted two batches, both to medium City Roast (just past the<br class="">
end of the first crack), and each was less than 6 minutes. I am using a<br class="">
vintage unit but have had similar performance from other devices. It sounds<br class="">
like your old air-popper may have had a temperature limit that kept it from<br class="">
getting hot enough. I did have one popper model that I had to hack into and<br class="">
bypass the low-temperature thermostat (but it still seemed to roast slow<br class="">
and did not last as long a unmodified units). In an air popper the roast<br class="">
should happen so quickly that it is easy to keep an eye on it.<br class="">
<br class="">
I put some notes about my current roasting/cooling setup into a blog post.<br class="">
My controls over the roaster are adjusting the recirculation of heat to<br class="">
increase the temperature of the air going into the popper and controlling<br class="">
the ventilation with a bilge blower. I think the photos show most of the<br class="">
details. I hope it makes sense. Ping me if you have any questions.<br class="">
<br class="">
<a href="http://fettricks.blogspot.com/2018/10/roasting-coffee-with-hot-air-poppcorn.html" class="">http://fettricks.blogspot.com/2018/10/roasting-coffee-with-hot-air-poppcorn.html</a><br class="">
<br class="">
Shane<br class="">
<br class="">
<br class="">
On Wed, Oct 24, 2018 at 7:53 PM Craig Cook via TriEmbed <<br class="">
<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a>> wrote:<br class="">
<br class="">
<blockquote type="cite" style="margin: 5px 5px; padding-left: 10px; border-left: thin solid #e67e22;" class="">I have been using this<br class="">
<a href="https://smile.amazon.com/gp/product/B00XK3ALS0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1" class="">https://smile.amazon.com/gp/product/B00XK3ALS0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1</a><br class="">
for the last 8 years roasting green beans.<br class="">
<br class="">
That has the side vents, takes ~30 mins to roast. Works *really* well. I<br class="">
burned the motor out 2 weeks ago. It's discontinued. Thought I should<br class="">
migrate to an arduino based version, hence my questions and asking for<br class="">
advice on what parts I should purchase.<br class="">
<br class="">
Yes, after the roast I dump the beans into a cooling basket.<br class="">
<br class="">
I have one of these to replace it:<br class="">
<a href="https://www.gopresto.com/product/presto-poplite-hot-air-corn-popper-04820" class="">https://www.gopresto.com/product/presto-poplite-hot-air-corn-popper-04820</a><br class="">
<a href="https://smile.amazon.com/gp/product/B00006IUWA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1" class="">https://smile.amazon.com/gp/product/B00006IUWA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1</a><br class="">
<br class="">
Given that new information, would it change the proposed design?<br class="">
<br class="">
It will be much better if I can control the roasting process though.<br class="">
Without control I get a few over roasted beans.<br class="">
<br class="">
Thanks for everyone's help.<br class="">
<br class="">
Craig<br class="">
_______________________________________________<br class="">
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<br class="">
------------------------------<br class="">
<br class="">
Message: 2<br class="">
Date: Thu, 25 Oct 2018 15:23:22 -0400<br class="">
From: Charles West <<a href="mailto:crwest@ncsu.edu" class="">crwest@ncsu.edu</a>><br class="">
To: TriEmbed <<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a>><br class="">
Subject: [TriEmbed] Long range digital communication (long range wifi,<br class="">
XBee?)<br class="">
Message-ID:<br class="">
<<a href="mailto:CAGojqSkE6PJ8tj5cL6YY=ppJxDt=WYamKJ9CdG-1gi9Qga0HGg@mail.gmail.com" class="">CAGojqSkE6PJ8tj5cL6YY=ppJxDt=WYamKJ9CdG-1gi9Qga0HGg@mail.gmail.com</a>><br class="">
Content-Type: text/plain; charset="utf-8"<br class="">
<br class="">
Hello!<br class="">
<br class="">
I'm in Lansdale, PA now but I was hoping I might be able to pick you guy's<br class="">
brains. My current big project is trying to build one or more robots to<br class="">
deliver food/drinks on golf courses. I'm currently trying to figure out<br class="">
the best way to maintain continuous(ish) contact between a access<br class="">
point/basestation at it's base of operations and 1 or more robots operating<br class="">
on the course.<br class="">
<br class="">
At a minimum, I would like to have the robot report its basic status<br class="">
(battery percent, GPS position) but it would also be great if it could<br class="">
stream video when required to allow teleprescence steering or determination<br class="">
of what is going on. The robot would probably be about 1 km from the base<br class="">
station at max.<br class="">
<br class="">
I'm currently considering 3 possible solutions but I'm pretty open to ideas:<br class="">
<br class="">
1. Use a mobile hotspot/cell modem:<br class="">
For fixed $130 and monthly $20, I can get a mobile hotspot which<br class="">
provides one gig of data per month and more data for $5/gig. If I keep the<br class="">
reporting really light, this could work but the communication would have to<br class="">
be kept pretty limited.<br class="">
<br class="">
2. XBee:<br class="">
These modules seem to float somewhere between $25 and $60 in<br class="">
prices, so a pair would be somewhere in the $50 to $120 range. Sparkfun<br class="">
had a good guide to XBee (<a href="https://www.sparkfun.com/pages/xbee_guide" class="">https://www.sparkfun.com/pages/xbee_guide</a>) but<br class="">
they are listing almost all of their products as retired (besides old<br class="">
series 1) and most of the stuff I read about XBee is from 2015-2016 so I am<br class="">
not sure what the best options are anymore. In any case, it looks like it<br class="">
would provide a low baud rate connection over the desired range. The main<br class="">
problem is that it requires working through XBee and making my basestation<br class="">
have to have special software to forward information. I'm also not sure<br class="">
about security and it is certainly not going to be streaming video.<br class="">
<br class="">
3. Long range Wifi:<br class="">
Rodney's done some work in this area before with his weather<br class="">
balloon projects. I don't recall off the top of my head how far he managed<br class="">
to get but I do remember he had to use higher power than allowed without a<br class="">
higher grade amateur radio license. That power level would not work for a<br class="">
commercial operation. There are some companies that are selling solutions<br class="">
aimed at farms (<a href="http://ayrstone.com/www/?v=7516fd43adaa" class="">http://ayrstone.com/www/?v=7516fd43adaa</a>) and there seem to<br class="">
be off the shelf solutions that can get 500 ft (mostly aimed at hotels).<br class="">
The hotel systems seem to be in the $350 range and the farm systems in the<br class="">
$500 or so. The robot could use a high gain antenna, but it is not clear<br class="">
how much it helps. These systems have security built in and potentially<br class="">
can stream video if the range is long enough. Like hotspots, writing<br class="">
software for them would also be easy.<br class="">
<br class="">
What do you guys think?<br class="">
<br class="">
Thanks,<br class="">
Charlie<br class="">
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<br class="">
------------------------------<br class="">
<br class="">
Message: 3<br class="">
Date: Thu, 25 Oct 2018 14:43:31 -0500<br class="">
From: Glen Smith <<a href="mailto:mrglenasmith@gmail.com" class="">mrglenasmith@gmail.com</a>><br class="">
To: Charles West <<a href="mailto:crwest@ncsu.edu" class="">crwest@ncsu.edu</a>><br class="">
Cc: TriEmbed <<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a>><br class="">
Subject: Re: [TriEmbed] Long range digital communication (long range<br class="">
wifi, XBee?)<br class="">
Message-ID:<br class="">
<<a href="mailto:CANwtiDV803kUwF2HeFvODfM54s1Bytey0MB3G497okKije-coQ@mail.gmail.com" class="">CANwtiDV803kUwF2HeFvODfM54s1Bytey0MB3G497okKije-coQ@mail.gmail.com</a>><br class="">
Content-Type: text/plain; charset="utf-8"<br class="">
<br class="">
Charles,<br class="">
<br class="">
I played around with Moteinos <a href="https://lowpowerlab.com/guide/moteino/" class="">https://lowpowerlab.com/guide/moteino/</a> for a<br class="">
while and had good luck with the RFM69 radios, I don't remember what<br class="">
frequency I was using.<br class="">
<br class="">
I just recently was listening to an episode<br class="">
<<a href="https://theamphour.com/398-an-interview-with-felix-rusu/" class="">https://theamphour.com/398-an-interview-with-felix-rusu/</a>> of The Amp Hour<br class="">
where Chris interviewed the guy who makes these - he is getting very good<br class="">
range depending on all the usual variables. It might be worth checking them<br class="">
out.<br class="">
<br class="">
Glen<br class="">
<br class="">
On Thu, Oct 25, 2018 at 3:23 PM Charles West via TriEmbed <<br class="">
<a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a>> wrote:<br class="">
<br class="">
<blockquote type="cite" style="margin: 5px 5px; padding-left: 10px; border-left: thin solid #e67e22;" class="">Hello!<br class="">
<br class="">
I'm in Lansdale, PA now but I was hoping I might be able to pick you guy's<br class="">
brains. My current big project is trying to build one or more robots to<br class="">
deliver food/drinks on golf courses. I'm currently trying to figure out<br class="">
the best way to maintain continuous(ish) contact between a access<br class="">
point/basestation at it's base of operations and 1 or more robots operating<br class="">
on the course.<br class="">
<br class="">
At a minimum, I would like to have the robot report its basic status<br class="">
(battery percent, GPS position) but it would also be great if it could<br class="">
stream video when required to allow teleprescence steering or determination<br class="">
of what is going on. The robot would probably be about 1 km from the base<br class="">
station at max.<br class="">
<br class="">
I'm currently considering 3 possible solutions but I'm pretty open to<br class="">
ideas:<br class="">
<br class="">
1. Use a mobile hotspot/cell modem:<br class="">
For fixed $130 and monthly $20, I can get a mobile hotspot which<br class="">
provides one gig of data per month and more data for $5/gig. If I keep the<br class="">
reporting really light, this could work but the communication would have to<br class="">
be kept pretty limited.<br class="">
<br class="">
2. XBee:<br class="">
These modules seem to float somewhere between $25 and $60 in<br class="">
prices, so a pair would be somewhere in the $50 to $120 range. Sparkfun<br class="">
had a good guide to XBee (<a href="https://www.sparkfun.com/pages/xbee_guide" class="">https://www.sparkfun.com/pages/xbee_guide</a>) but<br class="">
they are listing almost all of their products as retired (besides old<br class="">
series 1) and most of the stuff I read about XBee is from 2015-2016 so I am<br class="">
not sure what the best options are anymore. In any case, it looks like it<br class="">
would provide a low baud rate connection over the desired range. The main<br class="">
problem is that it requires working through XBee and making my basestation<br class="">
have to have special software to forward information. I'm also not sure<br class="">
about security and it is certainly not going to be streaming video.<br class="">
<br class="">
3. Long range Wifi:<br class="">
Rodney's done some work in this area before with his weather<br class="">
balloon projects. I don't recall off the top of my head how far he managed<br class="">
to get but I do remember he had to use higher power than allowed without a<br class="">
higher grade amateur radio license. That power level would not work for a<br class="">
commercial operation. There are some companies that are selling solutions<br class="">
aimed at farms (<a href="http://ayrstone.com/www/?v=7516fd43adaa" class="">http://ayrstone.com/www/?v=7516fd43adaa</a>) and there seem<br class="">
to be off the shelf solutions that can get 500 ft (mostly aimed at<br class="">
hotels). The hotel systems seem to be in the $350 range and the farm<br class="">
systems in the $500 or so. The robot could use a high gain antenna, but it<br class="">
is not clear how much it helps. These systems have security built in and<br class="">
potentially can stream video if the range is long enough. Like hotspots,<br class="">
writing software for them would also be easy.<br class="">
<br class="">
What do you guys think?<br class="">
<br class="">
Thanks,<br class="">
Charlie<br class="">
_______________________________________________<br class="">
Triangle, NC Embedded Computing mailing list<br class="">
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