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NM-RF-HAT FAQ

Product Overview​

Q1: What is NM-RF-HAT?​

NM-RF-HAT is a multi-functional RF expansion board for ESP32-2432S028 and NM-CYD-C5. It integrates common RF modules on one PCB to reduce wiring complexity and pin conflicts.

Q2: What modules are supported?​

  • CC1101 (433 MHz, FSK/GFSK)
  • nRF24L01 (2.4 GHz)
  • PN532 (NFC/RFID)
  • IR TX/RX
  • 433 OOK/ASK TX/RX
  • GNSS header for GPS expansion

Configuration and Usage​

Q3: How do I set the DIP switch?​

  • 1 ON: CC1101
  • 2 ON: nRF24
  • 3 ON: PN532
  • 4 ON: IR
  • 5 ON: RF433 OOK
  • 6 ON: Battery power switch

Note: Keep only one RF module from switches 1-5 enabled at once.

Q4: How to configure modules in Bruce firmware?​

  • CC1101: DIP 1 -> RF -> Config -> RF Module -> CC1101
  • nRF24: DIP 2 -> Use nRF24 functions
  • PN532: DIP 3 -> RFID -> Config -> RFID module -> PN532 (I2C)
  • RF433 OOK: DIP 5 -> RF Module -> M5 RF433T/R, then set TX/RX pins as required
  • IR: DIP 4 -> Configure IR TX/RX pins in firmware

Q5: How to configure GPS?​

Connect GPS first, then configure GPS RX/TX pins according to your firmware profile. For NM-RF-HAT setups, verify custom pin mapping before using features like GPS Tracker or Wardriving.

Common Problems​

Q6: Type-C power does not work, LED is off​

Some CYD units may fail with USB-C to USB-C cables. Try a USB-A to USB-C cable.

Q7: How can I identify CYD units with pre-flashed compatible firmware?​

Boards purchased from official NMTech channels are typically shipped with compatible firmware and display-driver settings. Always verify firmware version before testing RF modules.

Q8: Why can the module not be detected even after switching DIP?​

Common causes:

  • Multiple RF switches enabled at the same time
  • Loose cable or wrong connector orientation
  • Wrong module selection in firmware config
  • Inadequate power source

Further Help​