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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25 views

Can I connect the LoRa Module pin to SMA Antenna with wire?

I have RFM95W LoRa Module and an antenna with an SMA connector (you can see in the image below). The module does not have an SMA connector. There are just pins. Can I connect the SMA connector with ...
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52 views

RF Cable Loss on PCB

I'm calculating the link budget for a rocket communication that reaches 3km altitude. I'm using HopeRF RFM98W for both ends of the system. Max RF output: 20dBm Antenna Gain: 3dBi 3km FSPL at 433MHz: ...
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18 views

Communication between Ebyte E32-86820D and SX1278 Lora on ESP32 TTGO V1.6

Had anyone ever tryed to connect between the Ebyte UART module and the TTGO ESP32 Lora module at(868MHz)? I'm currently using two libraries for each module and I'm unable to transmitte a signal ...
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38 views

What is the irregular signal at the bottom of this “spectrogram”?

I am reading research papers about LoRa, and I have come across the below figure in this one. The horizontal axis is clearly labeled frequency, but the vertical one isn't. I recognize the chirps in ...
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27 views

Micro Cat Tracker PCB design

I would appreciate any advice how to improve PCB design to achieve the highest sensitivity for the GPS signal. The design is based on S76G chip. The tracker will be sewn or encapsulated in plastic ...
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1answer
28 views

Question on adafruit feather M0 LoRa SPI and LoRa radio

I am getting readings from CS5463 power monitoring chip using SPI on the feather. I want to transmit these readings onto the LoRa gateway I have setup. I have no problems only transmitting the values. ...
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41 views

What can be the missing values of BOM components acccording to datasheet ? LoRa sx1272

I have the schematic of LoRa sx1272 but some BOM components have no value. Could anyone help me to determine what are those missing values according to Datasheet? Datasheet: https://www2.mouser.com/...
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68 views

Turn Node MCU into a PLC which is integrated Lora module for IoT application

I've built a PLC that supports Lorawan and Modbus protocol using Node MCU. I managed to make it possible with Modbus by using OpenPLC. Everything worked well apart from its limitation in the distance ...
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28 views

LoRa RSSI value is not accurate

I want to use LoRa (SX1280) to locate devices by RSSI and TDOA. I put two LoRa devices on the table (within one meter,) one for TX one for Rx, and the RSSI values change a lot. Then I power off the TX ...
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120 views

Is Lora maximum transmission 1 km in real?

I'm new to wireless communication and Lora. I'm using Lora Ra-02 and Arduino UNO and small 800 Mhz antenna. I'm using Arduino website library. How can I increase that range? What do I need to do to ...
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26 views

Ferrite underlay impact on chip antenna performance

I'm designing a small wireless chargeable IoT device which also has TX/RX in subGhz frequency (LoRa). The idea is to stack everything on top of each other starting with charger RX coil, then ferrite ...
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49 views

What technology should I use for tracking small boats venturing upto 50km in the sea?

2017 south India was struck by a cyclone Okhi which took many small fishermen's life. I'm an electrical engineering student and want to do a project regarding tracking these boats and implement an ...
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3answers
105 views

Limiting battery input current to avoid voltage drop when activating LoRa radio

I have a battery-powered wireless sensor system that sends sensor information periodically. One requirement is that it has to be functional at very low temperatures. Powering this system is a Tadiran ...
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1answer
25 views

Connecting iM881A-M to Arduino

I want to connect iM881A-M LoRa module to arduino. And I want to ask which external parts I need to connect it. In datasheet there are many parts that I think I don't need to use. Please help me , I ...
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72 views

Connecting LORA SX1278 1W to Arduino UNO (LORA 5V Supply voltage but 3.3V communication voltage)

I bought this LORA modules: https://aliexpress.com/item/32791508935.html in the datasheet it says that the module needs a power supply voltage of 5V but the communication level is 3.3V. I've searched ...
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36 views

Creating a low cost raspberry lora node

I'm trying to integrate LORA communication in a project that uses a raspberry pi. I've bought this module to serve as a gateway for testing: https://www.amazon.es/gp/product/B076T28KWG/ref=...
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75 views

What is a good method for wireless transmission of images in a ~2km radius?

I am working on a project requiring regular image transmission over a 2km range. This needs to be done in an area with no cellular coverage. Energy efficiency is a factor, however it does not need ...
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40 views

B-L072 Discovery STM32 Board - DFU Mode

I am seeking to activate the DFU mode in the B-L072 Discovery Module using the Murata CMWX1ZZABZ-091 module. https://www.st.com/resource/en/user_manual/dm00329995.pdf I have kept BOOT0 pin to HIGH ...
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174 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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1answer
80 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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60 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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643 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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256 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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93 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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491 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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1answer
408 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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48 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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4k 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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4answers
299 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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191 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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575 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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108 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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2answers
514 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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348 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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537 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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124 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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1answer
828 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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94 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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1answer
376 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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322 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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436 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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2answers
1k 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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210 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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731 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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233 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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1answer
295 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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62 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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1answer
74 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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1answer
2k 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. ...