BelinRC ELRS-433-TX The high-frequency head is a new generation of remote control
wireless system developed based on the open-source project ExpressLRS. The ELRS system
has the characteristics of long remote control distance, stable connection, low latency,
high refresh rate, and flexible configuration.
1, Basic parameters
Frequency Band: (433MHz version/360-560Mhz optional)
Output power: 100mW/250mW/500mW/1000mW/(2000mW optional)
Refresh rate: 25Hz/50Hz/100Hz/200Hz
Input Voltage: 5-12V(2S)
Main control IC: ESP32+SX1278, backpack chip ESP8285
2, Basic configuration
By default, the ELRS-433-TX high-frequency head only accepts signals from the Crossfire
Serial Data Protocol (CRSF). The high-frequency head interface of the remote control
needs to support CRSF signal output. The following takes the OpenTX remote control
system as an example to illustrate how to configure the remote control to output CRSF
signals and use the LUA script to control the ELRS high-frequency head.
3, CRSF protocol
In OpenTX, select MODELSELECTION to enter the MODELSETUP page, where you can turn
Internal RF off (set to OFF), enable External RF, and set Output Mode to CRSF. This is shown
in the figure below.
If the ELRS-433-TX high-frequency head is connected correctly, and the remote control is
configured as the CRSF output of the external high-frequency head (External RF) according
to the above, the ELRS high-frequency head can be used normally in principle.
4,LUA script manipulation
If you want to modify the power and refresh rate of the ELRS high-frequency head,
you need to use the LUA script of the OpenTX system. It is shown below.
Copy the official LUA script ELRS.lua to the SD card of the remote control, the path is
Scripts/Tools;
On the OpenTX system, press and hold the SYS button (e.g., RadioMaster T8 remote
controller, etc.) or the MENU button (e.g., Frsky Taranis X9D remote controller, etc.) to
enter the SD-HC CARD interface, select the ELRS.lua script and run the script on the
interface
If the LUA script runs successfully, the following figure shows the page.
Using the LUA script, you can choose to configure parameters such as Rate, Ratio, and
Power. The following table describes all LUA script features.
Note: The official LUA script ELRS.lua can be downloaded from the ELRS support website
(see More Information section at the URL).
5, Alignment
The factory firmware of the ELRS high-frequency head uses the ExpressLRSV3.5.0 official
version of the protocol, and there is no binding phrase set. Therefore, the linking receiver
must also be V3.0.0~V3.5.0, and the linking password has not been set.The ELRS high frequency head enters the matching state. Use the LUA script and select
Bind. The ELRS high frequency head enters the matching state. See the "LUA Script
Manipulation" section for details.
6,Power setting
ELRS high-frequency head currently support 100 mw / 250 mw / 500 mw / 1000 mw/(2000 w) is
optional.
ELRS high-frequency head transmission Power switch to use LUA scripts, choose the Power, can be in
100 mw / 250 mw / 500 mw / 1000 mw / 2000 mw (optional) switch directly. See "LUA Script
Manipulation"
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