arduino 915mhz


You know what I mean: houses trees, whatever else or I could have a long straight run again without congestion and all that sort of stuff. So space well there’ll be no houses, no trees or anything like that. So I got thinking I thought. Well, I look at a map and I’ll see if anywhere turns up. So the first thing I was thinking is there’s a castle, and the castles in here it’s called you lo castle apparently was built in 1212 57 or something like that anyway, this castle, here I was thinking I could go to the top of the castle – put it On the top here then drive around all around the area down here down one of these roads or something and see how far I could get. But then I thought well it’s, actually not that great. I mean because if you look at this map here, this very useful map topography map – you can see that where it is, you just go back over there right there in the in between the legs. If you like, of this it’s it’s lower than its surroundings and obviously we’d be in a radio shadow, if we were to do that and that’s not ideal, so I thought forget that, but an interesting castle anyway, I was kind of looking forward to to go into The castle, but you know if it’s, not gon, na work, it’s not going to work so so yeah that’s that so we’ll get rid of that.

So the next place I was thinking was, I thought: well let’s, go back to the map and let’s look for the highest place around here then the highest place around here was this place here called Rossmore. You can see that it is actually quite high, so I was thinking of going to the top of this thing here, pouring it over there and then driving all around this road here and see how far I can get on this. This place. It’S quick look over here. It turns out to be there inside there, but the problem is with. This is look at the roads, so I put the top there but the roads. You know again the roads, aren’t ideal, and now I was thinking well. Okay, let’s have a look for somewhere, maybe not high up, but straight, and I thought ah I’ve got an idea and there’s a river here called the River Dee and basically it goes into Chester and I don’t really know much about it. But a long time ago. They had people dig this out way way way before I was born. I would imagine it’d be in the early nineteen hundreds or something they had this dog out and straightened and, as you can see, that would be ideal. Now, if you go back over here to the map, you can see that, of course, there’s no elevation it’s. All pretty much the same, so that would be perfect and then what’s more is that there are several little places that I could put the transmitter, so there’s a place here B and then over the other side, there are two more bridges and finally hardened bridge, which Is over here so are lots of different places, and I thought this would be perfect.

So if we have a look at the scale I don’t know if it’ll say measure distance from there. I don’t know about the measure distance here you can see that it’s. Seven point six five kilometers and that should be perfect. Okay, so I’ve got the transmitter in the back and I’ve got the receiver on my car, and I want to go up the other bridge in a few minutes. Well, in fact, here this bridge untie the bag onto it. Then I go to the other bridge and walk along with this and see if it receives okay, so I put it in the photo bag and tied it to a rail and I’ll just check that it’s blinking, yeah it’s. Definitely blinking and it’s flat. Definitely fun so let’s see, so this is hardened bridge and you can see the mystery over there. So what we’re gon na do next is go down here right down to the other end of the river just before the band in Chester, and we want to see if it can still receive so we’ll go down there. Now in the car and we’ll see what happens: okay so I’m here on the hi, Ferry Bridge and it’s blinking, so the transmitter is way way way down there let’s see if we can see one of the bridges now we can’t for them yeah the transmitter is Way down there, so it works perfectly and from why I remember that’s five miles: seven kilometers, not all chukka in a minute anyway, but yeah that’s extremely powerful.

So what I’m thinking now is, if it copes with that no problem, and it is on a second how about if we try and go a bit further down there, so in a bit the river bends towards Chester, so obviously that wouldn’t really be suitable, but I’m Thinking I should walk down there now and and try it okay, so now we’re at the bend of the river, so that’s the river there. You can see it just spending its gesture, as you can see: it’s still blinking every second, so that’s extremely far for a transmitter and receiver, especially a low power. One like this anyway, so it’s receiving the hello message every second and yeah we’re very, very far away. So um yeah I’m very impressed with this it’s extremely powerful. So when I go home, I’ll find out exactly what distance this is, and you know there it causes that distance. It could probably go even further, but yeah that’s good enough for me. Okay, so here’s harden bridge here list let’s just zoom into there and I’ll add the distance measuring thing. There then let’s zoom out a bit. So two bridges there are two or three bridges which I suppose form a light obstruction. Then we’ve got the footbridge over here, which is initially the one I was going to go to and did go to. But then I walked down here and I went to here where these little containers are – and this is where I finished so distance to here.

Seven point: nine one kilometers or four point nine one miles and there we go okay. So once again, these are the reacts ry l, r8, 90 transceivers and they are transceivers. I use this one to transmit and this one to receive, but they’re actually transceivers. They can both transmit and receive so that’s really cool. You can use them for a massive amount of different things. You can use them to control motors contactors, robots, possibly drones, and all that sort of stuff, radio, controlled toys or anything can use them for almost anything. They’Re really easy to use and they’re so reliable on so stable that it’s brilliant. So so, once again, I’d like to say thanks to reax for getting in touch of me and sending me these modules and if you’d like to try them out, I’ll, leave a link in the description and and you can check them out so yeah as usual.


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See the world through the eyes of this camera-equipped, snake-like robot.
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WidgetMesh Gateway

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WidgetMesh Gateway

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Originally posted 2015-12-03 10:17:11.

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Comment (27)

    1. that is some impressive range ^_^ think i found a ideal module to make a proper fireworks igniter that is controlled via android ^_^

  1. Hi Anthony, Nice test here, unfortunately you overlooked a few things that may land you in hot water… 915mhz is a licensed band in the UK and is used for mobile telephony, in the EU we should be using 868mhz LoRa transceivers to keep it legal. Also if you where using 868mhz transceivers you are also probably breaking the rules as there are duty cycle limitations in this band, transmitting every 1 second even with a 1 byte payload breaks this duty cycle. Anyway I would suggest looking at The Things Networking and LoRaWAN for your next experimentation, this offers internet connectivity for these devices on a community basis which looks promising.

  2. What were your spread factor, bit rate, and bandwidth or were all of these left in default mode? Did you perform a comparison with the theoretical vs. field testing?

  3. Hi, I made skech on Arduino +HC12 it is “weather statdion” , one module send date ( DHT22 hum and temp), second receive and dispay on oled, if you want tell me, best regards, very good tourtial. Meaby you can check yours modul’s with this one soft. Sorry – poor english

  4. Hello it was a nice tutorial and thank you for sharing knowledge. Kindly please share code and circuit diagram, will this module work through walls and trees?

  5. If I wanted to go to school to learn about transmiters and receivers, what would be the best place to enroll (in the U.S.).

    1. MIT is the most prestigious technology university, but probably overkill for your needs. Go to

  6. Do they works in optimal directions?
    What will be range?
    Or they are only for line of sight?
    Please do answer

  7. Should make a repeater with them and a solar cell and battery put a few out in the wild your distance would be pretty much unlimited up to how many repeaters you have. Could almost create some sort of “mesh network”.

  8. Hello, I have a question for you about the reyax module, I’m working with lora for a project , I need to make lora multi-point nodes but your example is the point-to-point connection, my question is: if I use a reyax module as a gateway and other two diferents reyax modules as lora nodes ,they could send information at the same reyax gateway ? or they only function with point-to-point connection?

  9. And this is achieved with the simple embedded wire antenna… Imagine the distance that little thing could do with a nice pair of yagi or patch antennas ? Insane!


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