BETAFPV ELRS 2.4GHz Micro TX Module - 1W

A ton of ExpressLRS items are available now! The ELRS Micro TX Module Case and Fan are released now! Upgraded module case with 6.5*13.5mm USB port housing is compatible with most USB Type-C cables. Moreover, there are two colors in the new module case. You can make your own module easily.

ELRS 2.4G 1W Version

The black version with maximum 1W RF output power is released now. Support all 5D button dimensions based on BETAFPV ELRS V2.0.0 firmware. A new backpack function is added, allowing wireless communication between ExpressLRS, and other FPV related devices for command and control, or for querying config. Note: Please make sure the VRX also supports backpack function when using the module VRX-backpack function. Backpack function will be added to the 500mW version in the future.

Compared with 500mW versions, it not only builds in a cooling fan but also the heat sink is included, which enhances the performance of cooling. So this module can work properly in daily use and not need to worry about temperature. Note: About the temperature test, please read the article ELRS Micro Module Temperature.

1W Limited Edition

Apart from the classical case for the micro TX module, a limited edition will be released together. Both classical case and limited case versions have the same function. The 3D-printed case with new appearance design makes the module very cool when LED light flashing. Limited stock, first come first serve!

Diagram

BETAFPV Micro RF TX module is compatible with radio transmitter which has the micro module bay (AKA JR/SLIM module bay, e.g. Frsky Taranis X9D, TBS Mambo). Below is the diagram for the 500mW version module.

Below is the diagram for ELRS 2.4G 1W version. DIP switches will be added to 500mW versions in the future.

How do I set a binding phrase on this Micro TX module when the ELRS official mainstream does not support OLED yet?

First, download the source code of master-betafpv-oled-menu branch to local from Github.

Second, open the ExpressLRS Configurator and load the upzip source code from local. Select the target device "BETAFPV 900/2400 TX Micro". Now, you could setup your own binding phrase and other options as normal.

Third, build & flash.

Button and OLED

The ELRS TX module could be configured via the OpenTX LUA script. With OLED and button, no-OpenTX radio controller that supports CRSF could use this ELRS Micro module easily. The following no-OpenTX radio controllers work well with this TX module. Futaba T16IZ, T16SZ and T18SZ (with update to 3.9e), Wsky ET16, Radiolink AT9S Pro

Long Press: 

In the lock screen page, long press to unlock and enter the menu page. In the menu page, long press to change the value of this row.

Short Press:

In the lock screen page, short press invalidly.

In the menu page, short press to move to the next row.

Note: When the RF TX module is entering menus page, the connection between RF TX module and receiver will be lost, the connection will recover after exiting menus page automatically; you must re-power the receiver if you have changed the Pkt Rate. Note: When the RF TX module enters WIFI Upgrade status, the button will be invalid. Please re-power the RF TX module after firmware update via WIFI.

Below is the basic operation of the button and OLED for BETAFPV ELRS V2.0.0 firmware. Long Press: Unlock and enter the menu page, or apply current settings in the menu page. Up/Down: Move to the last/next row. Left/Right: Change the value of this row. Short Press: Enable binding status or WiFi upgrade status.

Note: You must re-power the receiver if you have changed the Pkt Rate. Note: When the RF TX module enters WIFI Upgrade status, the button will be invalid. Please re-power the RF TX module after firmware update via WIFI.

Basic Configuration ExpressLRS uses the Crossfire serial protocol (AKA CRSF protocol) to communicate between the radio transmitter and the TX module. So make sure your radio transmitter supports the CRSF serial protocol. We use the radio transmitter with the OpenTX system to show how to set up the CRSF protocol and LUA script. To set this up, in the OpenTX system, enter into model settings, and on the "MODEL SETUP" tab, turn off the "Internal RF". Next, enable "External RF" and select "CRSF" as the protocol.

ExpressLRS use the OpenTX LUA script to control the TX module, like bind or setup. With the LUA script, pilots could check, and set up some configurations of the Nano RF TX module. For more details, please check the Support Page. Save the ELRS.lua/ELRSV2.lua script files onto the radio transmitter's SD Card in the Scripts/Tools folder; Long press the "SYS" button (for RadioMaster T16 or similar radios) or the "Menu" button (for Frsky Taranis X9D or similar radios) to access the Tools Menu where you can find ELRS/ELRSV2.lua script ready to run with only one click; Below image shows the LUA script run successfully; ELRS.lua script

Bind & Output Power

The Micro RF TX module comes with officially major release V1.1.0 or V2.0.0 protocol and no Binding Phrase included. So please make sure the receiver works on officially major release V1.0.0~V1.1.0 or V2.0.0 protocol. And no Binding Phrase set. Micro RF TX module could enter binding status via ELRS.lua or ELRSV2.lua script, as described in "LUA Script" chapter. Besides, using the button and OLED, move to the BIND position and long-press the button. Short press the button if it is V2.0.0. Then the RF module will enter binding status. ELRS.lua script.

Note: The LED will NOT flash when entering binding status. The module will exit from binding status 5 seconds later auto. Short and consecutive press 3 times to bind. ELRSV2.lua script.

Note: The LED will NOT flash when entering binding status. The module will exit from binding status 5 seconds later automatically. Note: If you reflash firmware of the RF TX module with your own Binding Phrase, please make sure the receiver has the same Binding Phrase. The RF TX module and the receiver will bind automatically in this situation. Micro RF TX module could switch the output power via ELRS.lua or ELRSV2.lua script, as described in "LUA Script" chapter. Besides, using the button and OLED, move to the Output position. Switch the output power by long-pressing the button (ELRS.lua script). Pushing the button left or right (ELRSV2.lua script). ELRS.lua script.

Note: The RGB LED will NOT change according to the output power. When the output power is 250mW or above, the fan will spin automatically. The Micro RF TX module does NOT support 1W or 2W output. When switching to this value, the system will move to 500mW automatically. ELRSV2.lua script.

Specifications

Packing List

1 * BETAFPV ELRS Micro TX module 

1 * BETAFPV Moxon antenna (2.4G, 915MHz or 868MHz) 

1 * Monopole antenna 

1 * Micro TX module user manual 

1 * Spare USB data cable (Type-A to Type-C)

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