This is a project inspired by the Flipper Zero and the ook-remote.
The goal is to identify, record, & spoof RF remotes (like the WEN3410 air filter at the hack space).
-
CC1101. Lots of modules available. I have a D-Sun CC1101 and an Ebyte E07-M1101D, they seem about equivalent. SMA connector, 2x5 male pin header, 2 mounting holes near the antenna. The D-SUN mounting holes are slightly more convenient. There's also one called AS07-M1101S. For building into a portable product, a module with solderable through holes instead of the pin header may be preferable.
-
nRF24L01 "Not recommended for new designs", but it's hard to argue with $1 boards from ebay. https://www.sparkfun.com/datasheets/Components/SMD/nRF24L01Pluss_Preliminary_Product_Specification_v1_0.pdf
Connect by USB-C to a laptop or an Android phone (serial terminal or custom app).
Pros:
- simple to build (no battery & charging)
- simple to talk to (minicom or pySerial)
Cons:
- Conspicuous to have a dongle out and connected.
LiPo battery & USB charging.
LiPo battery options:
- 1x18650: 2200 mAh, 19 mm x 68 mm
- 2x18650: 4400 mAh, 38 mm x 66 mm
- Adafruit Feather battery: 400 mAh, 17.5 mm x 37 mm (fits under a Feather or Pico)
Cons:
- battery & charger
- Bulkier
The device is a featureless brick, like a USB "power bank". It has a USB port (for charging the battery) and an on/off switch.
You connect by Bluetooth or Wifi to a UI on a laptop or phone. This is very inconspicuous - you can leave the device in a pocket or backpack and just play with your phone or laptop.
Or web UI over IP-over-USB, e.g. https://github.com/maxnet/pico-webserver?
I don't know of an RP2040 board with both LiPo and Wifi. I could use a Pico W and and external LiPo charger/power supply like this one:
BOM:
- Pico W (21 mm wide, 51 mm long)
- CC1101 module of some sort (FIXME)
- Pimoroni Pico LiPo Power Shim (fits under Pico W, solders onto its headers)
- LiPo battery
- 3d printed case
RP2040 board options:
- Pico W
- Seeed Wio RP2040 https://www.seeedstudio.com/Wio-RP2040-mini-Dev-Board-p-4933.html
- Arduino Nano RP2040 Connect
Pico GPIO | Pico Pin | D-Sun CC1101 module
-------------------+----------+--------------------
3V3 Out | 36 | VCC
GND | 38 | GND
-------------------+----------+--------------------
GPIO 2 (SPI0 SCK) | 4 | SCK
GPIO 3 (SPI0 TX) | 5 | MOSI
| | GDO2
GPIO 4 (SPI0 RX) | 6 | MISO
GPIO 1 (SPI0 CSn) | 2 | CSN
| | GDO0
-------------------+----------+--------------------
C or Rust?
I really want to use Rust but i'm not sure about software support.
https://reltech.substack.com/p/getting-started-with-rust-on-a-raspberry https://www.alexdwilson.dev/learning-in-public/running-rust-code-on-raspberry-pi-pico
https://github.com/rp-rs/rp2040-project-template https://github.com/rp-rs/rp-hal https://github.com/rp-rs/rp-hal-boards/
Install rustup and make a personal toolchain. :-/
# curl | sh craziness to install rustup
$ rustup toolchain install stable
$ rustup target add thumbv6m-none-eabi
$ cargo install elf2uf2-rs --locked
$ cargo install flip-link
Edit .cargo/config.toml to switch to the elf2uf2-rs runner.
Reset/power-cycle the pico while holding the Bootsel button. Mount the pico anywhere.
$ cargo run --release
$ sudo mount /dev/sda1 /mnt -o umask=0 && cargo run; sync; sudo umount /mnt
$ cargo doc --open
console on usb?
Unknown:
Embassy?
Pico SPI?
Web server/GUI?
egui?
<https://github.com/emilk/egui>
<https://www.egui.rs/#demo>
Does embassy-net do mdns? it does igmp but doesnt look like mdns
Working:
Pico W wifi chip (Infineon CYW43439):
<https://lib.rs/crates/cyw43>
<https://github.com/embassy-rs/embassy>
<https://github.com/embassy-rs/embassy/tree/main/cyw43>
Pico USB console
<https://github.com/rp-rs/rp-hal/issues/652#issuecomment-1639975385>
embassy-usb-logger
The enclosure holds a Raspberry Pi Pico W, a D-SUN CC1101 module, a
Pimoroni "LiPo SHIM for Pico", and a LiPo 18650 battery. The FreeCAD
files (and STLs) are in the enclosure/ directory.
M2 wood screws to hold the radio and the Pico-W to their standoffs.
M2.6 wood screws to hold the two parts of the enclosure together. Predrill #42 (2.375 mm).
https://docs.rs/cc1101/latest/cc1101/
https://github.com/28757B2/cc1101-driver
https://github.com/mengguang/cc1101
https://github.com/mcore1976/cc1101-tool
https://github.com/LSatan/SmartRC-CC1101-Driver-Lib
https://github.com/gusgorman402/RFmoggy
https://github.com/ea/srxe_cc1101
https://www.printables.com/model/537529-raspberry-pi-pico-rp2040-cc1101-tool-chassis