How Hack a DIY Radio Remote for Accessibility Beacons

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Objective: Create a sound beacon for visually impaired individuals, activated via standardized radio remotes (NF S 32-002 – 868.3 MHz).

Prototype Hardware:

  • Arduino Nano + CC1101 (Radio Module)
  • Raspberry Pi Pico W + CC1101 (SPI0 Interface)

Key Features:

✅ Radio Compliance: NF S 32-002

✅ FSK Transmission: 868.3 MHz

✅ Automatic UID Generation

✅ LED Emission Visualization

You Should Know:

1. Decoding FSK Radio Frames

Use `rfcat` or `GNU Radio` to analyze FSK signals: 

rfcat -r 868300000 -f 250000 -d RfCatChronos -v

2. SPI Communication Testing (Raspberry Pi Pico W)

Check SPI connectivity via Linux:

ls /dev/spidev

Python script for SPI test:

import spidev 
spi = spidev.SpiDev() 
spi.open(0, 0)  Bus 0, Device 0 
spi.max_speed_hz = 500000 
spi.xfer2([0x01, 0x80, 0x00])  CC1101 register read

3. UID Extraction from Radio Signals

Capture and decode UID using `rtl_433`:

rtl_433 -f 868.3M -R 0 -Y autolevel -M newmodel -F json

4. Triggering Sound Beacon

Linux command to play sound upon UID detection:

!/bin/bash 
while read -r uid; do 
if [[ "$uid" == "EXPECTED_UID" ]]; then 
aplay /path/to/beacon.wav 
fi 
done < <(rtl_433 -f 868.3M -F json -M protocol)

5. LED Feedback for Transmission

Arduino code snippet:

void setup() { 
pinMode(LED_BUILTIN, OUTPUT); 
} 
void loop() { 
digitalWrite(LED_BUILTIN, HIGH); // TX Active 
delay(100); 
digitalWrite(LED_BUILTIN, LOW); 
}

What Undercode Say

This project bridges IoT prototyping and accessibility tech, leveraging open-source tools (rfcat, rtl_433) and low-cost hardware (CC1101, Pi Pico). Future hacks could include:
– Replay Attacks: Capture and retransmit UIDs using HackRF.
– Frequency Hopping: Bypass jamming with GNU Radio scripts.
– Wi-Fi Beacon Spoofing: Extend range using ESP32.

Expected Output:

  • Functional sound beacon triggered by DIY remote.
  • Validated SPI/RF communication logs.

Prediction

Radio-based accessibility devices will face security challenges (e.g., signal hijacking), necessitating encrypted UIDs (AES-128) in future revisions.

Relevant Links:

References:

Reported By: Fran%C3%A7oismocq Maker – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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