🚗🔊 Add-On Reverse Radar: Never Let a Bike Rack Block Your Safety!
Love cycling so much that you bolted a hanging bike rack to the hatch—only to find the factory parking sensors now “see” nothing but metal?
Relax. Here’s a dirt-cheap, dead-reliable DIY fix: an ESP-NOW-based wireless reverse radar that kills the blind spot in minutes.
Why It Matters 🚲⚠️Hanging racks love to cover the OEM sensors. Result:
- Non-stop false beeps – you dread reversing;
- Total silence – you dread what you can’t see.
Our add-on restores peace of mind: zero wire cutting, zero head unit hacking, 100 % plug-&-play.
Bill of Materials 🧰How It Behaves 📏🔊
As intelligent as the factory-fitted radar, yet unaffected by obstruction from the single-bike frame!Looks & feels factory—yet the rack is invisible to it.
Pairing: You Do Nothing 🔗📡Buzzer board boots → checks EEPROM for radar MAC.
- Not found? Broadcasts its own MAC and listens.
Radar board does the same dance.
They swap addresses, store once, auto-connect forever.
Data Filtering & Sound Logic ⚙️🎶5-sample median filter kills acoustic glitches.
Linear frequency map between 150 cm and 25 cm; full blast below 25 cm.
Why It Rocks ✨📺 0.96" OLED → live cm read-out
📱 BLE bridge → tweak thresholds from any phone
📡 Triple-radar mesh → left-centre-right coverage
Get Building 🔧Schematic, PCB, BOM, 3-D printable cases & firmware—all open on GitHub:
👉 Clone it now ➜ OpenELAB/Radar_Cube
Star ⭐ & fork if you improve it!
Wrap-Up 📝🎉Two XIAO ESP32-C3s + one sonar + one buzzer = the last word in bike-rack-induced radar blindness.
✅ No wire cutting
✅ No configuration after first boot
✅ Battle-tested filter
✅ Fully open-source
Let tech guard your back while you guard the pedals.
🚴♂️🚗💨 – from one cyclist-maker to the world
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