Category: LoRa

  • QuadMeUp Crossbow LRS: introduction

    Few days ago I mentioned that I'm working on my own DIY long range radio system (LRS) that I named QuadMeUp Crossbow LRS. Today I will share some more details about it. First of all, I'm not creating anything new or "amazing". There are plenty of "DIY" or OpenSource LRS systems. OpenLRS for example. Or…

  • E45-TTL-100 not transmitting when connected to Arduino

    While working on one of my project involving Arduino and E45-TTL-100 LoRa 868MHz radio modules, I’ve discovered that it is not working exactly like expected. Documentation states: (…) When the data inputted by user is up to 58 byte, the module will start wireless transmission (…)(…) When the required transmission bytes is less than 58…

  • Testing 868MHz LoRa range, part 3: round trip

    After determining that range of 868MHz LoRa wireless modules E45-TTL-100 have, at least, quite impressive range (5,7km and I was out of line-of-sight to test further) I’ve decided to test something else. In the beginning I was planning to use those radio modules for telemetry only, but then another thought crossed my mind: why not…

  • Quick note on SEMTECH SX1276 100mW output mode

    Few facts about SEMTECH SX1276 LoRa modem and 20dBm (100mW) mode: +20dBm (100mW) is possible only on PA_BOOST pin Pins RFO_LF and RFO_HF allows only up to +17dBm (50mW) Maximum allowed duty cycle while using +20dBm mode is 1% Maximum allowed VSWR while using +20dBm mode is 3:1 The biggest problem with +20dBm on PA_BOOST…

  • Testing 868MHz LoRa range, part 2: open space

    It was a good weekend. At least for me and CDEbyte E45-TTL-100 868MHz LoRa serial wireless modules based on SX1276. Why? Since weather was nice and looks like those modules are way better than datasheet specifies. Specs states: 3km in open space. And I’ve proven almost twice that much range! Last Friday I’ve placed one…

  • Testing 868MHz LoRa range, part 1: urban area

    With a (more less) free evening I decided to finally start testing range of 868MHz LoRa E45-TTL-100 radio modules I described only yesterday. Instead of building new testing rig, I only upgraded testing setup I used to test range of FS1000A and XY-MK-5V 433MHz radio modules. Few hours later I came up with this: E45-TTL-100…

  • Hands on: E45-TTL-100 868MHz LoRa wireless modules

    My quest for ultimate (?) DIY telemetry system for UAVs continues. Last year I was playing with HC-12 433MHz wireless modules with pretty decent results. After all, more than 1km of range for a few bucks is more than acceptable. Still, HC-12 has at least few problems: 433MHz band is very often polluted and used…