Challenger RP2040 SubGHz

by Invector Labs

Image of Board

The Challenger RP2040 SubGHz board is an Arduino/Circuitpython compatible Adafruit Feather format micro controller board based on the Raspberry Pico (RP2040) chip.

This is a spin-off from our Challenger RP2040 LoRa board but in this case we replaced the LoRa module with a low power SubGHz radio module also from Hope RF. The transceiver features a proprietary long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.

The RFM69HCW is a transceiver module capable of operation over a wide frequency range, including the 315,433,868 and 915MHz license-free ISM (Industry Scientific and Medical) frequency bands. Currently we are only supporting the 868 and 915MHz bands but this may change in the future. All major RF communication parameters are programmable and most of them can be dynamically set. The RFM69HCW offers the unique advantage of programmable narrow-band and wide- band communication modes.

The RFM69HCW is connected to the RP2040 via SPI channel 1 and a few GPIO’s that is required for signaling. A U.FL connector is used to attach your antenna to the board.

Technical details

  • +20 dBm – 100 mW Power Output Capability
  • High Sensitivity: down to -120 dBm at 1.2 kbps
  • High Selectivity: 16-tap FIR Channel Filter
  • Bullet-proof front end: IIP3 = -18 dBm, IIP2 = +35 dBm,80 dB Blocking Immunity
  • Low current: Rx = 16 mA, 100nA register retention
  • Programmable Pout: -18 to +20 dBm in 1dB steps
  • Constant RF performance over voltage range of module
  • FSK Bit rates up to 300 kb/s
  • Fully integrated synthesizer with a resolution of 61 Hz
  • FSK, GFSK, MSK, GMSK and OOK modulations
  • Built-in Bit Synchronizer performing Clock Recovery
  • Incoming Sync Word Recognition
  • 115 dB+ Dynamic Range RSSI
  • Automatic RF Sense with ultra-fast AFC
  • Packet engine with CRC-16, AES-128, 66-byte FIFO
  • Built-in temperature sensor



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CircuitPython 8.0.0-beta.4

This is the latest unstable release of CircuitPython that will work with the Challenger RP2040 SubGHz.

Unstable builds have the latest features but are more likely to have critical bugs.

Release Notes for 8.0.0-beta.4

Built-in modules available: _asyncio, _bleio, adafruit_bus_device, adafruit_pixelbuf, aesio, alarm, analogbufio, analogio, array, atexit, audiobusio, audiocore, audiomixer, audiomp3, audiopwmio, binascii, bitbangio, bitmaptools, bitops, board, builtins, busio, collections, countio, digitalio, displayio, dotenv, errno, floppyio, fontio, framebufferio, getpass, i2ctarget, imagecapture, json, keypad, math, microcontroller, msgpack, neopixel_write, nvm, onewireio, os, paralleldisplay, pulseio, pwmio, qrio, rainbowio, random, re, rgbmatrix, rotaryio, rtc, sdcardio, select, sharpdisplay, storage, struct, supervisor, synthio, sys, terminalio, time, touchio, traceback, ulab, usb_cdc, usb_hid, usb_midi, vectorio, watchdog, zlib

Included frozen(?) modules: adafruit_rfm69

Absolute Newest

Every time we commit new code to CircuitPython we automatically build binaries for each board and language. The binaries are stored on Amazon S3, organized by board, and then by language. Try them if you want the absolute latest and are feeling daring or want to see if a problem has been fixed.

Past Releases

All previous releases are listed on GitHub, with release notes, and are available for download from Amazon S3. They are handy for testing, but otherwise we recommend using the latest stable release. Some older GitHub release pages include the same binaries for downloading. But we have discontinued including binaries as assets on newer release pages because of the large number of files for each release.