Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [lora]

LoRa (Long Range) is a wireless networking topology that focuses on low power and long range. It is frequently associated with M2M (machine-to-machine) and IoT (internet of things) networking technologies.

-1
votes
0answers
33 views

Where to add RF power amplifier [closed]

I am trying to make a SX1262 circuit using this schematic, I have the values for the passives from the BOM already. But I do not understand the schematic very much, where would I place an rf amplifier ...
0
votes
0answers
29 views

LoraWan Packet Repeater

I want to use some kind of lora-wan packet repeater or Amplifier that would amplify the lora signal, so that I can use this kind of repeater in place where there are blind spots. I know about packet ...
2
votes
3answers
42 views

Peak TX current of LoRa RFM95W

I'm running into some issues powering a test board using a LoRa chip (RFM95W) with a CR2032 battery. I'm well aware of the peak current limitation of such battery and I can see a major voltage drop ...
-1
votes
2answers
45 views

RFM95/96 Multi Transmitter and One Receiver

We're working on a model rocket project. And we need two transmitters and one receiver. One of the transmitters is for the rocket body and the other is for the scientific payload in the rocket; the ...
-2
votes
1answer
58 views

What is TTGO LoRa? [closed]

I did search for TTGO and LoRA and found nothing on Google and Bing. I know it is related to Radio frequency but no documentation or website.
0
votes
1answer
58 views

74HC589 - stock lead times are high, looking for alternative parallel to SPI tri-state chip for ESP8266

My prototype was going to use 74HC589 as a parallel to SPI interface for ESP8266-07 MCU. They are in short supply for quick delivery at the moment. I am asking for suggestions for a similar chip ...
1
vote
0answers
40 views

Weighing LoRa and Xbee pro 900MHz

I created a post before about wirelessly transferring messages from sensor to gateway that would be at most 2km apart from each other. The message would go through gateway to local server. I would be ...
0
votes
2answers
127 views

Why different SFs in LoRa are said to be orthogonal?

As orthogonality is an important characteristic in LoRaWAN but most public references just make a conclusion that different SFs are orthogonal. This confused me a lot and hope to make a clear ...
0
votes
1answer
93 views

Low power design, choosing correct buck-boost converter for LiPo battery

I want your opinion on subject considering low power applications. I want to build basic loraWan tracker with Murata Lora module(3V3), and I want to use LiPo battery. What Im struggling with is power ...
1
vote
0answers
167 views

LoRa RX-Single Mode Inconsistent RX-Timeout Interrupts

I'm trying to implement LoRa communications using an SX1276 module (DRF1276G) and an ATmega328P on a custom PCB. I've got it mostly working but I'm having a strange issue with the timeout interrupt. I'...
0
votes
1answer
73 views

LoRa modulation and chirp process clarification

I am new to LoRa and I would like to get some confusion on chirp-based modulation process clarified. I was reading the very good thread Understanding the relationship between LoRa chips, chirps, ...
2
votes
1answer
376 views

Can’t get simple LoRa receiver to work

I’m in the process of attempting to create a very simple, small, LoRa sensor based on an sx1276 module and an ATmega328P. My ATmega328p is communicating with the sx1276 module happily, but I can’t ...
0
votes
1answer
54 views

LC Network in Microchip's LoRa Gateway

I am reading the microchip's LoRaWan Gateway manual. On Page 48, I got stuck at receiving side on the LoRaWan RF circuit. It ...
1
vote
1answer
185 views

How do LoRa end-devices configure their upstream and downstream communication?

I'm in the process of building a LoRa end device, and am also designing protocol. I plan on using the channels specified in the AUS915 ISM Band as outlined in the LoRaWAN regional parameters (though i'...
0
votes
1answer
220 views

Connecting Lora and FSK clients to a single server

I need to connect a Raspberry Pi (as the server) to some different Arduino devices as clients. Some of the clients need to connect using Lora SX1278 modules, and others use NRF24L01+ (or any similar ...
3
votes
2answers
149 views

Top Ground Copper pour in PCB having three RF Sections

I am designing my second RF board (First one had BLE). This board has LoRa Components (SX1257 and SX1301), GPS (MAX-6) and 4G LTE Module (SIM7600). All the components are on top layer (red layer). My ...
0
votes
2answers
637 views

AVR(or PIC) vs ARM for LoRaWAN nodes [closed]

Well, you can say that the title is a little bit misunderstanding. I do not want to compare these architectures, it's worthless. I am trying to understand why an engineer could ever pick for his ...
0
votes
1answer
136 views

Is a PCB a requirement for an RFM95 family for HopeRF LoRa modules?

I watched a few videos and read a couple of blogs regarding the HopeRF RFM95W family of transceivers. All of the videos recommend using a breakout PCB similar to this one or this other one, or this ...
1
vote
1answer
369 views

Selecting DC Blocking Capacitors for GPS, LoRa

I am designing a transmitter and receiver part of LoRa and GPS. It requires DC Blocking capacitors. I was looking for capacitor over digikey and I am amazed most of the manufacturer haven't specified <...
1
vote
0answers
135 views

LoRa radio transceiver for PtP mesh?

So after being informed on the Amateur Radio Exchange this isn't quite HAM/Amateur Radio, posting here. So I'm, well, very new to general RF/radio in general other than basic WiFi, but I'm looking at ...
1
vote
1answer
160 views

Chip and Chirp rate in LoRa

I'm a bit confused with LoRa. I understand the CSS modulation with the chirps, but I don't get what chips are. Are chips parts of the chirps? I saw another topic on this, but the difference is not ...
1
vote
0answers
51 views

Interfacing LoRa SX1301 IC to third-party RF front-end

I am reading the datasheet of SX1301. I got struck at SX1301 RX operation using a third party RF front-end topic (Page 22). The page (22) says: In that mode the ...
0
votes
1answer
51 views

Private star network topology on Sub-1GHz

I have a project which there is a need to be implemented many sensor nodes in a star network topology. One collector-gateway and multiple transmitters. The farthest sensor node from the "collector-...
2
votes
1answer
874 views

Creating a LoRaWAN gateway with multiple nodes?

I'm working with a project to collect temperature data from about 50 cabins that are located close together. It therefore seems easiest to use 50 Lora nodes with temperature sensors and one gateway. ...
0
votes
1answer
365 views

LoRa SX1272 BOM missing components

I am designing a PCB that will have LoRa communication using the SX1272 , currently I am using the Reference Design for both 868 and 915MHz (image below). But the BOM attached is missing components ...
0
votes
2answers
139 views

Crystal for LoRa Transceiver

I am using an SX1272 and am having trouble locating viable distributors of any of the 32 MHz crystals recommended by Semtech, listed in the Crystal Oscillator Guidance documentation. I also can't find ...
3
votes
2answers
2k views

sx1276 Understanding matching network

I want to use the sx1276 LORA ic as a node that can transmit and receive at 868MHz. In order to use that band of frequency one has to use Higher frequency rf pins of the chip (rfo_hf and rfi_hf). The ...
0
votes
0answers
406 views

Internet access to LoPy (ESP32) using its GPIO pins

LoPy is a LoRa module which uses ESP32 chipset. It has WiFi and Bluetooth connectivity for Internet. In my setup, I have certain interference issues, so I can't use WiFi nor Bluetooth to connect my ...
-1
votes
1answer
502 views

Is the SX1278 SPI interface 5v tolerant?

I want to connect the SX1278 LoRa module with its SPI interface to a microcontroller. My module Datasheet But in the datasheet I haven't found anything about the maximum digital input voltage. ...
0
votes
1answer
709 views

Can I use a RN2483 to make a LoraWAN gateway?

I have a Microchip RN2483 LoRaWAN module and I would like to use it for making a LoraWAN Gateway. Is it possible? If it is, how can I do it? Or if it is not, why?
1
vote
2answers
231 views

A Single Antenna for Multiple Sub-GHz Receivers

I am thinking about making an inexpensive LoRa geteway by combining eight single-channel RFM95W 915 MHz transceivers. These would just work as receivers, and I would have a 9th one working separately ...
4
votes
1answer
289 views

Am I using Shannon-Hartley Theorem and thermal noise correctly here?

I'm trying to learn about noise, sensitivity, and the Shannon-Hartley theorem, and I'm using some specs for a LoRa node IC to try it out. The Shannon-Hartley theorem says that the maximum data rate \$...
0
votes
2answers
266 views

How can we make LoRaWAN work in Real World [closed]

Today, there are many competitive IoT providers and technologies initiated by many organisations across the world. Sigfox and LoRa Alliance I believe are in the top of the competition line but, please ...
0
votes
0answers
142 views

How can I test my radio module without software to be sure it is not physically broken

I have recently bought a modtronix InAir9 radio module that I use with a Raspberry PI Zero W to play with the LoRa network. I ...
0
votes
0answers
118 views

License free frequency spectrum in Australia

What is the license free frequency spectrum in Australia? Is it 433Mhz or 915Mhz Or 868Mhz? I am trying to do some IOT Project using RF (LORA/ZigBee) modules. I thought it was 433Mhz. But some online ...
2
votes
2answers
992 views

Host hopping mesh network over LOR or ZigBee

I am looking to do a proof of concept for a project where each node will broadcast a set of data (GPS Related) in predefined intervals, so every other node do some processing based on that data. I ...
1
vote
0answers
497 views

Possible timing issues with Microchip RN2903 LoRa module?

Is anyone using the Microchip RN2903 LoRa module? This module is soon to be replaced by the RN2903A module due to the fact that the RN2903 didn't go to sleep properly. Microchip also re-tuned the ...
1
vote
1answer
65 views

can I use a Miller Solar engine for RF applications?

I'm thinking of using a Miller Solar Engine to power a Arduino clone with a RF transmitter. i.e., solar panel + super capacitor + low-power Arduino + RF95W. However, I read that MSE's are ground-...
1
vote
0answers
301 views

What is the compiled size of Semtech LoRaMAC node libraries?

I'm trying to determine if the microcontroller I intend to use for a project will have enough flash memory for my preferred SDK and also the LoRaMAC libraries. Does anyone know roughly what the ...
4
votes
2answers
1k views

What is SEMTECH's “secret sauce” that makes LoRa Picocells viable?

tl;dr: "Standard" LoRa and specifically LoRaWAN are not designed to support many densely packed independently operated networks like WiFi does (for example). And yet SEMTECH has announced they will ...
11
votes
2answers
8k views

Understanding the relationship between LoRa chips, chirps, symbols and bits

I'm trying to understand the actual relationship between LoRa chips, "chirps", symbols and bits. I don't mean just the equations that relate the various rates, but actually how these things relate ...
5
votes
1answer
9k views

How to calculate the data rate of LoRa?

Picture below is from this web, how to calculate the data rate ? For example, how much kbps is Bw125Cr48Sf4096 ?
2
votes
1answer
888 views

Can 900MHz and 2.45GHz Antennas be differentiated by shape?

edit: In view of the helpful comments below, I just wanted to show an example of a cheap plastic antenna that does have an inductor inside. In this case, the antenna is shorter and the wavelength ...
-1
votes
1answer
162 views

How to minimize degradation of physically overlapping but separately managed/owned LoRaWAN networks?

Wireless networks such as WiFi and Bluetooth are designed to work well even when many separately owned and managed networks overlap physically. For example, an apartment building full of personal WiFi ...
2
votes
3answers
465 views

Star sub-network with LoRa capability?

I am working on a project where I will have 2 or 3 sensors inside a house, all sending data back to a central sensor/hub in a star network configuration. This central sensor would then buffer all the ...
3
votes
1answer
2k views

SX1272 - LoRa - What is the minimal schematic (needed capacitors/resistors) to use that device?

I'm interested in SX1272 by Semtech. It's a LoRa modem. I'm not the best at reading datasheets. Maybe it's because of my poor English. I wonder what is the minimum schematic of such a chip? What ...