#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