#667 – Long Distance with CNLohr-a

Welcome back, CNLohr!

• CNLohr was on the last episode talking about the CH32V003 part and the CH32V003fun library


• Charlieplexed errings


• Fast iteration


• Lohr-a…LoRa…get it?


• LoRa

https://www.youtube.com/watch?v=eIdHBDSQHyw

• Started in January 2024 with discussions with mustardtiger / Frank


• Charles had done Wifi long range before


• Also FM from ATTINY85


• Ethernet + AM


• Radio signals without radios


• USB


• Harmonics


• LolRa


• Upchirps / downchirps


• 903.825 – 903.975 mhz


• Michael Ossmann talk


• LoRa doesn’t do code matching


• JP Norair talking about LoRaWAN / DASH7


• Tool / emulator for the airwaves


• 3 lines of the repo


• Tool to create tables


• There are two 2 lookup tables (up and downchirps)


• Table is different for differnet spreading factors and base frequencies


• Andreas Spiess LoRa/LoRaWAN distance attempts


• Spreading Factor — can’t past SF10 on this setup for unknown reason


• AirSpy


• Matt Knight


• LoRaWAN — protocol vs network


• The Things Network / Helium


• Activation by personalization


• Nesting dolls of encryption


• New parts CH32V002 (also, -005, -006. -007)


• Charles is excited about the op amp on the CH32V006 that has 64 MHz GBW


• CH32V203 – 144 MHz – $0.24, has usb xcvr


• CH32X035 is self clocking – best low cost option for USB


• All are supported in library now


• Community – CNLohr discord


• Porting examples for the parts using the technical reference manual


• MNIST database – handwriting recognition system


• Announcement post on CNX about the new parts


• It’s possible to hook up parts directly through the 1 pin SWIO, so you can hot-load firmware


• Writing code onto a “scratch pad”


• Want to see more CNLohr experiements online?
  
  
  
  • Youtube.com/cnlohr
  
  
  • discord: cnlohr reach out for invite
  
  
  • Github