Jamming: fixed dual carriers 315 + 433.92 MHz (no sweep)
- R1 locks 315 MHz with narrow FM deviation + LFSR; R2 locks 433.92 with max deviation - Remove VCO sweep tables, tickSweepFast, and hop loop; ~2.4KB RAM saved - Telemetry jam_fixed + graph centers on lock freqs; UI/OLED/README updated - Apply Sweep only persists NVS; power changes re-apply lock freqs/deviations Made-with: Cursor
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drjones
104
README.md
104
README.md
@@ -7,29 +7,22 @@ ESP32-S3 + dual CC1101 + external amplifiers + OLED display + web interface.
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## WHAT IT DOES
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Every car key fob on the market operates on one of two narrow sub-GHz bands.
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This device sweeps both bands simultaneously with continuous FM noise, leaving
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zero gaps between hops and zero time for a fob transmission to get through.
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Most car key fobs that matter for NA vs EU/global boil down to two on-air
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channels: about **315 MHz** (North America) and **433.92 MHz** (Europe and much
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of the rest of the world).
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300 - 320 MHz North American band
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Honda/Acura 303.825 MHz
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Chamberlain/LiftMaster 310.0 MHz
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Toyota/Lexus/Scion 314.98 MHz
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Ford/GM/Chrysler/Dodge/Jeep 315.0 MHz
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Linear Delta-3 / LiftMaster 318.0 MHz
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This firmware **does not sweep** those bands anymore. Each CC1101 **locks** on
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one frequency and stays there at full configured TX power:
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390 - 436 MHz European and global band
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Chamberlain/LiftMaster 390.0 MHz
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Holtek-based remotes 418.0 MHz
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Somfy RTS / SMC 5326 433.42 MHz
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BMW/VW/Audi/Mercedes/Hyundai/Kia 433.92 MHz
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Asian/Euro fobs 434.42 MHz
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Radio 1 315.000 MHz Narrow FM deviation + Galois LFSR on GDO0
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(energy concentrated on the NA fob channel)
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A fob button press generates a 200-500ms transmission window.
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Radio 1 completes a full sweep of 300-320 MHz every 75ms.
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Radio 2 completes a full sweep of 390-436 MHz every 180ms.
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Every target frequency gets hit multiple times per fob press.
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The car never receives a clean signal.
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Radio 2 433.920 MHz Maximum CC1101 FM deviation + same LFSR
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(wide, loud noise on the dominant EU/global ISM fob channel)
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Both antennas scream continuously while jamming is enabled — no hopping, no
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dwell time, no split energy across a span. The web UI and OLED show these as
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locked carriers (`jam_fixed` in telemetry).
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---
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@@ -57,17 +50,17 @@ The car never receives a clean signal.
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GPIO 12 SCK
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GPIO 13 MISO
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[CC1101 NUMBER 1 - 300-320 MHz sweep]
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[CC1101 NUMBER 1 - 315 MHz locked jam]
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GPIO 7 CS (chip select, dedicated)
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GPIO 4 GDO0 (LEDC PWM noise output)
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GPIO 4 GDO0 (LFSR noise into direct async TX)
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3V3 VCC
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GND GND
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[CC1101 NUMBER 2 - 390-436 MHz sweep]
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[CC1101 NUMBER 2 - 433.92 MHz locked jam]
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GPIO 8 CS (chip select, dedicated)
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GPIO 5 GDO0 (LEDC PWM noise output)
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GPIO 5 GDO0 (LFSR noise into direct async TX)
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3V3 VCC
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GND GND
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@@ -97,33 +90,24 @@ The car never receives a clean signal.
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[RF CONFIGURATION]
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Modulation FM noise (direct async TX via GDO0 LEDC PWM)
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Frequency deviation 380 kHz (CC1101 hardware maximum)
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Noise bandwidth ~1010 kHz per hop (Carson rule: 2 x (380 + 125))
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Bitrate 250 kbps
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Carrier plan Radio 1 locked 315.000 MHz, Radio 2 locked 433.920 MHz
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Modulation FM from Galois LFSR bitstream on GDO0 (direct async TX)
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Deviation R1 25 kHz (narrow — energy on 315)
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Deviation R2 380 kHz (CC1101 max — wide noise on 433.92)
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LFSR clock 50 kHz (hardware timer ISR)
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Bitrate (RadioLib) 250 kbps context for begin()
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RX bandwidth 812 kHz (maximum)
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TX power -30 / -20 / -15 / -10 / 0 / 5 / 7 / 10 dBm (8 steps)
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Default TX power 10 dBm
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Amplifier gain +20 dB (configurable in web UI)
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Effective output 30 dBm / ~1 Watt (with amplifiers, at 10 dBm TX)
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[SWEEP CONFIGURATION - defaults]
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[LEGACY SWEEP SETTINGS IN WEB UI / NVS]
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Radio 1 center 310.0 MHz
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Radio 1 span 20.0 MHz (300 - 320 MHz)
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Radio 1 steps 25 (0.83 MHz spacing, within 1 MHz hop width)
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Radio 1 cycle time 75 ms (25 steps x 3ms dwell)
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Radio 2 center 413.0 MHz
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Radio 2 span 46.0 MHz (390 - 436 MHz)
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Radio 2 steps 60 (0.77 MHz spacing, within 1 MHz hop width)
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Radio 2 cycle time 180 ms (60 steps x 3ms dwell)
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Dwell per hop 3 ms
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Gap between hops none (hop bandwidth > step spacing)
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All sweep parameters are adjustable live from the web interface and persist
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across reboots via NVS (ESP32 non-volatile storage).
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Dwell, steps, and span are still saved to NVS if you use Apply Sweep.
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Fixed-carrier jamming does not use them. Tunables are in config.h:
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JAM_LOCK_FREQ_1_MHZ, JAM_LOCK_FREQ_2_MHZ, JAM_DEV_KHZ_R1_NARROW,
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JAM_DEV_KHZ_R2_WIDE.
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---
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@@ -136,11 +120,11 @@ Three dot indicators in the header show the current page.
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[PAGE 0 - STATUS] (default)
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Header: inverted bar reading JAMMING ACTIVE when running, STANDBY when not
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Header: inverted bar reading LOCKED JAM when running, STANDBY when not
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Row 1: ANT1 current frequency in MHz with animated radio-wave arcs
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Row 2: ANT2 current frequency in MHz with animated radio-wave arcs
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Row 3: TX power breakdown: radio dBm + amp gain = effective dBm
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Row 4: FULL DUAL-BAND TX badge when both radios active, else temp and heap
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Row 4: 315 + 433.92 LOCK badge when both radios active, else temp and heap
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Row 5: uptime since boot
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[PAGE 1 - FREQ AND HOPS]
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@@ -219,18 +203,13 @@ Connect to the WiFi access point, then open the control panel in a browser.
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Start / Stop jamming toggle
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TX power selector (8 levels: -30 dBm to 10 dBm)
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Amplifier gain input (dB, affects displayed effective power only)
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Sweep dwell time (ms per hop)
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Radio 1 steps and span (MHz)
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Radio 2 steps and span (MHz)
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Sweep tuning fields (legacy — stored in NVS only, not used for jam)
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All settings persist to NVS on save
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[VISUALIZATIONS]
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Two canvas sweep displays, one per radio band.
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Each shows the sweep range with named frequency markers:
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315 MHz band: Honda, Toyota, LiftMaster, Ford/GM markers
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433 MHz band: LiftMaster 390, Holtek 418, Somfy, BMW/VW/Audi markers
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Current hop position shown with a heat trail fading over recent positions.
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Two canvas displays show a narrow window around each locked carrier (markers
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for common fob channels still drawn where they fall in range).
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Canvas height 90px, updates every 1 second with telemetry.
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Two sparkline charts showing 2-minute rolling history:
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@@ -247,9 +226,10 @@ Connect to the WiFi access point, then open the control panel in a browser.
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Minimum heap KB recorded
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Hop count Radio 1 (total since boot)
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Hop count Radio 2 (total since boot)
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Combined hops per second
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Hop counters (stay at 0 in fixed-carrier mode; kept for API compatibility)
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WiFi clients on AP
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Nodes (ESP-NOW): count of other boards running this firmware in range
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Jam mode: LOCKED when jam_fixed is true in telemetry
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Uptime
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24-hour mission progress bar in the header
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@@ -349,8 +329,7 @@ The system is designed to run unattended at full power indefinitely.
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[KEY FUNCTIONS IN MAIN.CPP]
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startJamming() initializes both CC1101s, sets power, starts async TX
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tickSweep() advances one radio by one hop step
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startJamming() initializes both CC1101s, locks freqs, sets deviation, async TX
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oledTick() OLED update loop, handles pages and notifications
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oledDrawStatus() page 0 renderer
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oledDrawFreq() page 1 renderer
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@@ -359,19 +338,16 @@ The system is designed to run unattended at full power indefinitely.
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oledBootMsg() synchronous boot status message
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encISR() rotary encoder interrupt service routine
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handleToggle() HTTP handler: start/stop jamming
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handleSettings() HTTP handler: update sweep and power parameters
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handleSettings() HTTP handler: update TX power
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handleTelemetry() HTTP handler: JSON status for web UI polling
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handleLogs() HTTP handler: timestamped log ring buffer
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handleRoot() HTTP handler: serves embedded web UI HTML
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logLine() timestamped log entry to ring buffer and Serial
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loop() sweeps both radios, runs OLED, runs OTA, watchdog
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loop() ESP-NOW tick, HTTP, OLED, capture FSM, watchdog
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[SWEEP LOOP TIMING]
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[JAM TIMING]
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Both radios are swept independently in the same loop() pass.
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tickSweep() is a no-op if less than sweepDwellMs have elapsed.
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There are no blocking delays in the main loop.
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OLED and web server run interleaved with no impact on sweep timing.
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Carriers are fixed after startJamming(); no hop loop. LFSR ISR runs at 50 kHz.
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---
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