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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Understanding LORA XL1276-P01 Module

i'm trying to understand Lora Modem base on XL1276-P01 module. and this is the circuit I got from doing tracing on the module. what is the function of the block I circled? I would love to understand ...
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39 views

Are SX1276 DIOx pins necessary?

This is about a SX1276 Semtech chip dev custom board: For this project, is there anything missed when not connecting any of the DIOx pins to my microcontroller? I meant, in my project I have no pins ...
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24 views

How large is difference in range between LoRa devices on different frequencies?

I recently bought Lilygo T-Beam device with frequency 923Mhz for my country. I wonder if there is some big difference in usable range (in km) between low and high ...
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156 views

Impedence matching required for very short PCB trace?

I have a custom PCB using 50 ohm impedance antennas for GPS (1.575 GHz), GSM (2.4 GHz), and LoRa (868 MHz). Currently using an impedance matched board with matching track widths of 6 mil. One track ...
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105 views

Ground plane placement in relation with LORA spring antenna

I am making a simple lora transciever and absolutely want to fit it on a single side dual layer 0.8mm thick pcb. Which makes impedance matching a bit tricky with 53mil traces... Here the form factor ...
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52 views

Problems with track for LoRa RF

Following up on this question, I am using an RN2903 module with a U.FL connector (with an additional option for a through-hole wire antenna). My PCB looks like this: I used this coplanar waveguide ...
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23 views

Arducam ESP32S Uno Pinout

I am trying to attempt to hook up an Adafruit Lora RFM9X to an Arducam ESP32-S Uno board. However, I am receiving the following error: Failed to put device in Lora Mode RH_RF95_REG_01_OP_MODE: 0 I ...
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39 views

2.4GHz BLE and 900MHz LoRa coexistence

I am working on a new design for a simple BLE to LoRa bridge. I have a chip antenna for LoRa that covers 868-915MHz and I was following the Nordic reference design for the 2.4GHz BLE antenna. What ...
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83 views

ESP32 based device schematic review

I am building an IoT device with ESP32 WROOM as a host MCU. I have already made two test PCB with it, and show somewhat unstable behavior. The issues are; It seems like USB-UART is unstable. ...
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71 views

Need Help Using A Radio Module (Gain Value)

I'm using the RFM98PW-443S2 RF module for a project. Microcontrollers I will be using this module with separately are: STM32F446RET6 and ATmega2560. Datasheet link: https://www.hoperf.com/data/upload/...
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216 views

Trace impedance calculation in Altium for RF

I am routing the RF trace for a Microchip RN2903 LoRa module. The datasheet states the following: I wanted to use Altium to calculate the width of the trace automatically, so that it had a 50 Ohm ...
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118 views

which antennas is better for 433 Mhz 30dbi LoRa module [closed]

I am searching a antenna for LoRa module. my first priority is distance. which is more long range, it is better for me. There are 3, 433Mhz 3dBi antennas. Can you help me which is best and why? if you ...
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49 views

CE marking of devices using pre-certified radio modules without antenna, just a 50 ohm RF port

I'm right now working on a project involving 2 radio modules, a SIM800F and a LoRa1276-C1-868. The modules are already certified under the radio equipment directive. In the case of the LoRa module it ...
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29 views

How to implent a LoRa class A by Arduino?

I'm trying to make communication between multi node and one gateway using Arduino Uno and LoRa(SX1278). I read from "LoRaWAN® Specification v1.0.3" document that in class A, every endnode ...
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31 views

How can I read the data of all nodes at the simultaneously with LoRa

assume that we have 4 e32 433T30d nodes we are measuring temp and sending to a center point. as a image atteached. I am using arduino. I am using this library with arduino https://github.com/xreef/...
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106 views

What keeps frying my RF switches?

Short version: What might be breaking the first sensitive component connected to an ungrounded 14cm UHF dipole antenna mounted 30' above the ground? Could it be related to static electricity? I have ...
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122 views

How to separate PCB antenna and SMA connector?

I am designing a prototype PCB for a Lora node. It will have an SMA connector (J2) and a PCB antenna. Switching RF connectors are not available in my area, so as an amateur enthusiast what is a good ...
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40 views

My Lora adafruit feather m0 won't send join request

So, I got a new LoRa module from Adafruit called Feather m0 (900MHz). I tried running a modified example code, but could not send a "join request" to the live-server. I haven't really ...
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46 views

Is it possible that a 12V transformer is creating EM interference that's coupling onto a long antenna cable?

I have an Arduino Mega, Adafruit RFM96W 433MHz LoRa Transceiver Breakout and 2 Channel OptoCoupler Relay Module. https://www.adafruit.com/product/3073 https://www.amazon.co.uk/SUNFOUNDER-2-Channel-...
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27 views

Data from my IoT node isn't displayed

I have a LoRa module called Adafruit Feather M0. I tried programming with Arduino in order to eventually display data. The data doesn't show up. What I've done is that I've registered my LoRa device ...
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33 views

Lora sx1278 implementation by Arduino Uno

I'm implementing a Lora network, with two SX1278 modules and Arduino Uno. Lora is based on three classes. A , B and C, The question is : for change For example A to B, what should exactly change in ...
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75 views

Transmiting analog signal with lora

I want to transmit an analog signal over Frequency Modulation with a Lora RA 02 module. First thing I need to do is convert the analog signal from the audio source to digital, right?. But I had so ...
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52 views

Antenna Attenuation, Gain and RSSI calculation

I am using a RAK7258 LoRa gateway operating at EU-868MHz. I am looking to have the gateway and the antenna on each side of a wall (gateway inside, antenna outside) and receive some packets from some ...
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lorawan end-device in class B

i am trying to implement Lorawan network in Arduino uno and end-devices are in class B. My question is how i build beacon and brodcast in network ? or there is a command in lorawan mac layer to do ...
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48 views

Lora Antenna frequency

I ask a antenna supplier about if his 433mhz antenna, if it is compatible with a 433mhz LORA chip, and his answer was "NO". Is there any variantes when it comes to antennas with the same ...
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LoRa CSS modulation chip rate and bandwidth

In this question, as well as in many other detailed explanations of how LoRa CSS modulation works, each analysis starts by saying that the chip rate, Rc, is equal to the bandwidth BW. Why is that?
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74 views

SX1276 LoRa - Implicit mode - Not knowing PayloadLength at reception

I'm trying to use SX1276 in Implicit Header Mode, and extracting the PayloadLength after ValidHeader interrupts. The first byte ...
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85 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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72 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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45 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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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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80 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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82 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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95 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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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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151 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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30 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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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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162 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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33 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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277 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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58 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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82 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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477 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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87 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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1k 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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608 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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161 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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852 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 ...