The Amp Hour

Long Distance with CNLohr-a

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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
        • ...more
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        The Amp HourBy The Amp Hour (Chris Gammell and David L Jones)
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