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.

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19 views

Lora Ra-02(SX1278) Module Maximum Transmission Distance (Non LOS)

I was trying Lora Communication for a Project and i m having trouble getting the required range. Im using an Ra-02 module (433Mhz) with antenna(433MHz 3db 5cm) and i was able to get a 300m range(Not ...
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Data transferring in mesh topology

I'm using LoRa device In mesh network "slave" is transfer data into "master", and there another network "master " is located so, if there is any chance to redirect the slave data into nearby master?
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is it possible to connect two lora module(sx1278) to single lora module to recieve both nodes data

i am planning to do a project in lora where i have multiple lora based sensor nodes and all node are connected to single point to collect data from every sensor , so is it possible to connect single ...
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72 views

Ground Plane for Flying Antennas (literally)

I am building a weather balloon sensor baord with a LORA 868 MHz radio module (RFM95x). The sensor will rise up to 30km and should transmit the full time. I am using a PCB trace antenna with ground ...
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24 views

Microchip MCC LoRaWAN Library support for newer PIC16 8-bit Microcontrollers

I am building a LoRaWAN enabled sensor using a PIC1618446 8-bit microcontroller and a SX1276 based LoRa Module. I found that Microchip has a MCC LoRaWAN library for helping with this task. However, ...
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76 views

LoRa RFM95/SX1276 libraries for PIC 8 bit microcontrollers

I recently finished prototyping a LoRa RFM95 transceiver with an Arduino Uno using the RadioHead RFM95 library. I am now transitioning to designing a PCB for my project and chose a PIC16F18446 ...
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99 views

Can I use a 2.4 GHz antenna for 900 MHz signal?

I have a 900MHz LoRa device that I want to attach a more directional antenna to. I have a 2.4GHz corner reflector sitting around. I was wondering if I can replace the current omnidirectional antenna ...
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82 views

LDO requirement for battery powered micro-controllers [closed]

What are the selection parameter for battery powered ultra low powered application? (Battery capacity of 3700mAh, 3.7V 18650 Li-ion) I'm designing an application with MSP430/Atmega328 + RF micro-...
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What could potentially affect some specific LoRa frequencies among others and how to mitigate it?

I have started a small LoRaWAN network. I already have setup: 1x LoRaWAN gateway (LAIRD RG186, using EU863-870); 4x T/RH Nodes (Dragino LHT65, same standard); LoRa ...
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62 views

How to increase range of LoRa

I'm pretty new to wireless communication and Lora. I've read in many places that with Lora in urban areas "you can expect up to 2- to 3-km-wide coverage, while in the rural areas it can reach beyond ...
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91 views

STM32F103 SPI Pinout Problem

I am currently working on a project with LoRaWAN technology using STM32F103C8T6 microcontroller. For LoRa I am using SPI in Full-Duplex Master mode (spi1 specifically) and in CubeIDE when you activate ...
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131 views

Quality factor in antenna matching / question about SX1261 LoRa transceiver

I have a question about how the quality factor is determined for RF antenna matching, especially for PI network matching. The reason for the question is the Reference Design for antenna matching for ...
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37 views

LoRa and Manufacturing Technology

Which manufacturing technology do the LoRa (Semtech SX1276) belong to? Is it a CMOS based chip?
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572 views

How to define the SPI pins in an ESP32 module?

I am working on a project where I am integrating BME688 ,CAN, LoRa, SD card, ePaper display and WiFi module. I am using the board Heltec LoRa V2. And I have found this pin diagram. What I don't ...
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26 views

Prepare gateway for a LoRA device

I have a LoRA chip and a microcontroller. I have written all the low level codes that establish the proper UART connection, read/set DEVUID, AppKey etc and then sends a "...
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66 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 ...
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134 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 ...
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106 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 ...
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273 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.
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73 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 ...
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84 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 ...
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292 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 ...
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193 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 ...
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353 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'...
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107 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, ...
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595 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 ...
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70 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 ...
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285 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'...
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285 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 ...
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265 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 ...
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899 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 ...
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176 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 ...
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551 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 <...
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189 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 ...
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224 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 ...
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59 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 ...
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62 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-...
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1k 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. ...
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673 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 ...
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182 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 ...
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3k 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 ...
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439 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 ...
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610 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. ...
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891 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?
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268 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 ...
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355 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 \$...
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293 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 ...
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155 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 ...
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131 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 ...
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1k 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 ...