Specifications

• ESP32-PICO-D4, SX1281, ExpressLRS Firmware
• PA/LNA: AT2401C
• RF Frequency: 2.4GHz ISM
• Telemetry power: 20dbm (100mW)
• True Diversity
• Receiver protocol: CRSF
• Antenna connector: IPEX MHF-1

• Power supply: 4-13V DC @ “V” Pad
• Power dissipation:  100mA~170mA@5V IN
• PCB size: 28mm x 16mm
• Weight: 4g w/ antenna
• Packing:
  • 1x ELRS-R24-TD
  • 2x IPEX MHF1 Antennas. 15cm

RGB LED Status

• [Rainbow fade effect], Starting Up
• [Green heartbeat], Web update mode enabled
• [Slow blink 500ms on/off ], Waiting for connection from transmitter
• [Red flashing 100ms on/off], Radio chip not detected
• [Orange Double blink then pause], Binding mode enabled
• [Orange Triple blink then pause], Connected to transmitter but mismatched model-match configuration
• [Solid single color Connected to a transmitter], color indicates packet rate
• in Boot mode, RGB LED doesn’t light up.

Firmwares

• ExpressLRS,  wiki, Click HERE
• Receiver Target:  Generic ESP32 True Diversity PA 2.4Ghz RX /or RadioMaster RP4-TD /or HappyModel EP Dual
• Any of variants based on Target “Generic ESP32 True Diversity PA 2.4Ghz RX” can be flashed.
• Receiver has ExpressLRS 3.3.2 preloaded with binding phrase “123456”,  the Receiver will never enter binding mode if using the traditional binding procedure.
• You need to reflash it with your binding phrase OR connect it to your PC/phone via WiFi and set your binding phrase in WebUI.

Tips

• Full Resolution Switch Configuration Modes
• Powering receiver with Reverse Voltage will damage the regulator chip. DOUBLE CHECK the power wires connected to the receiver.

Flashing via Wifi

• Power on receiver. RGB LED Rainbow fade effect at first, then Slow blink 500ms on/off.  after 20s,  Green blink indicating it’s on Wifi Hotspot Mode.
• Wifi SSID “ExpressLRS RX”,  Password “expresslrs”
• More detailed steps,  pls refer this page.

Flashing via UART

1. Wire the receiver into the USB-TTL adapter, with TX on receiver connected to the Rx on the USB-TTL, and RX on receiver connected to the Tx of the USB-TTL. Wire 5V and GND of the USB-TTL to 5V and GND of the Receiver.
2. Press the boot button while powering on the receiver, then release – the RGB LED will not turn on.
3. In Configurator,  Select the target Generic ESP32 True Diversity PA 2.4Ghz RX, or RadioMaster RP4-TD, or HappyModel EP Dual  and  “UART” for Flashing Method,  set your bind phrase and Firmware Options , Check “erase before flash” and “Force FLash “.
4. Web-flasher  https://expresslrs.github.io/web-flasher/