• Crossbow LRS, hardware

    Weather outside is bitchy. Period. It rains, then it's windy and then maybe there is some direct sunlight for 15 minutes. No way to fly or test my DIY RC radio link. But, there is some progress after all. My latest changes seems to be working just fine. On a bench link was stable for…

  • Crossbow LRS, I was doing this wrong…

    Last update on Crossbow LRS DIY RC link I'm currently building was 2 weeks ago. Back then, it did not went well: crashed an airplane beyond field repair. Last weekend I was able to do what I planned, but that did not went well as well. This time from completely different reason… Link was catching…

  • How brushless outrunner electric motors are winded

    Motor winding adventure continues. In this video I show and tell about: 12 coils (12N) 14 magnets (14P) dLRK winding schema WYE and Delta termination schemas

  • Project Dualcopter – worklog #4

    More than a year after staring this damn project, I finally decided what goes where. And on top of that, short description how Dualcopters works (or at least should work). There are two counter rotating propellers on top. They are responsible for thrust and YAW control When both props turns faster, dualcopter gains altitude When…

  • A proper way of doing read callback receive with Arduino LoRa

    Arduino LoRa is a great library that brings LoRa support (SX1276/SX1277/SX1278/SX1279) to Arduino world. I'm using it in my Crossbow LRS project (still not stable enough for flight, work in progress). Until now, the biggest problem with this library I've found is that examples suggests that heavy protocol processing inside interrupt callback is fine. Unfortunately,…

  • Video tutorial: 5.8GHz Inverted Vee antenna for FPV

    Today another video tutorial. It’s just simpler to show how to make something on video than with text and images. So, without further ado: How to make Inverted Vee antenna for 5.8GHz FPV at home. All that is required is: coax cable (here RG316) SMA/RP-SMA connector copper welding wire caliper soldering station basic tools At…

  • DIY RC radio link: the problem of protocols

    So, you want to build your own RC radio system? Long range maybe? Cool, I want to do it too. Since I’m pretty deep in that topic now, I can give you a hint or two. For example, have you thought about a protocol your radio system will implement? Or rather should I say: protocols?…

  • Hands on: LoRa32u4 II 868MHz LoRa development board

    Idea for Crossbow, DIY LRS system did not appearned in my mind out of nowhere. All my previous LoRa attempts were aimed at telemetry purposes only. E45-TTL-100 are cool, but bulky. If I would want to use them, I would either have to attach Arduino to it or hack it open and reprogram onboard CPU…

  • Hands on: FrSky XSRF3O flight controller

    Since I just started to add support for “old” FrSky XSRF3O flight controller to INAV (expect this in a release after 1.8) it might be a good idea to share few words about it. First of all, it comes in a box. Why am I mentioning this? Because none of my flight controllers, and I…