Gemini ELRS 2.4G TX
91737146933971. Product introduction:
Gemini ELRS 2.4G TX (dual radio 2.4G ELRS tuner)
2. Application scenarios:
It can provide the most optimal solution for scenes that require high refresh rate, high-quality control links, and long-distance, such as flying machines, fixed wings, and model aircraft.
3. Product overview:
ELRS is no longer an unfamiliar term in the field of traversing aircraft and other aircraft models. High refresh rate, high quality, long distance, open source, and everyone can make it themselves are the advantages of ELRS. The current 2.4G ELRS control link uses a sx1280LoRa radio frequency chip to send and receive data. This project uses two sx1280 radio frequency chips to achieve higher quality control on the premise of referring to many open source ELRS projects and ELRS official guidelines The link and signal quality (LQ) have been greatly improved compared with single radio frequency chips. The word Gemini has the meaning of "twin", which is also derived from this.
The GEMINI TX module has 2 SX1280 transceivers and simultaneously transmits packets with a frequency difference of 40MHz. True Diversity RX is used to receive two packets at the same time. Transmitting on 2 separate frequencies, in this case it is better to avoid DVDA by sending duplicate packets sequentially on different frequencies to provide better interference immunity and higher link quality.
4. Product parameters:
1. Interface: JR warehouse
2. Main controller: ESP32-PICO-D4
3. RF chip: 2 E28-2G4M27SX
4. Backpack function: ESP-01F
5. Maximum power: 250mw
6. PCB information:
(1) Board size: 39.888mm x 55.949mm
(2) layer: 2 layers
(3) Layout: Single-sided layout (convenient for heating table welding), as shown in the 3D diagram below:
Gemini ELRS 2.4G TX hardware project Figure 1
5. Instructions for use:
Since there is no screen at present, all parameter adjustments rely on LUA scripts, so only open source remote controls are supported, such as EdgeTX, OpenTX, etc.
For component soldering, please refer to the attachment "Component Location Map.zip".
Please refer to the attachment "Firmware Flashing Process.zip" for the specific firmware flashing process. If you need pre-compiled firmware, please refer to the attachment "Firmware and Configuration Files.zip".
For the shell printing file, please see the attachment "shell.zip"