The BETAFPV Micro RF TX module is based on the ExpressLRS project, an open source RC link for RC applications. ExpressLRS aims to achieve the best possible link performance in terms of speed, latency and range. This makes the ExpressLRS one of the fastest RC links available while still offering long-range performance.
Lots of ExpressLRS items are now available!
The ELRS Micro TX Module Case and Fan are released now! The upgraded module case with 6.5*13.5mm USB port housing is compatible with most USB Type-C cables. Besides, there are two colors in the new module case. You can easily create your own form.
Specifications
- Item: ELRS Micro TX module
- Input voltage: 5V~12V
- XT30 port: 5V~12V, recommend 2S (8.4V) battery, NOT support 3S (12.6V) or above
- USB Port: Type C
| 2.4GHz 1W | 2.4GHz 500mW | 915/868 MHz 500 mW | |
| Package update frequency | 50Hz, 150Hz, 250Hz, 500Hz | 50Hz, 150Hz, 250Hz, 500Hz | 25Hz, 50Hz, 100Hz, 200Hz |
| RF output power | 25mW, 50mW, 250mW, 500mW, 1W | 25mW, 50mW, 250mW, 500mW | 100mW, 250mW, 500mW |
| Frequency bands | 2.4GHz ISM | 2.4GHz ISM | 915MHz FCC 868MHz EU |
| Radiator | Included | Not included | Not included |
| Backpack function | Support | I don't currently support | I don't currently support |
ELRS 2.4G 1W version
The black version with maximum RF output power of 1W is now available. Supports all 5D button sizes based on BETAFPV ELRS V2.0.0 firmware. A new backpack feature has been added, allowing wireless communication between the ExpressLRS and other FPV-related devices for command and control or querying configuration.
Note: Please make sure your VRX also supports backpack function when using the module's VRX backpack function. The backpack function will be added to the 500mW version in the future.
Compared to the 500mW versions, it not only incorporates a cooling fan, but the heat sink is also included, which improves the cooling performance. So this module can work properly in daily use and you don't need to worry about the temperature.
Note: Regarding the temperature test, please read the article ELRS micromodule temperature .
Limited edition 1W
Apart from the classic case for the micro TX module, a limited edition will be released together. Both the classic and limited versions have the same function. The 3D printed case with new aesthetic design makes the module very interesting when the LED light flashes. Limited stock, first come, first served!
Diagram
The BETAFPV Micro RF TX module is compatible with the radio transmitter that has the micromodule housing (AKA JR/SLIM module housing, e.g. Frsky Taranis X9D, TBS Mambo). Below is the diagram for the 500 mW version module.
Below is the diagram for ELRS 2.4G 1W version. DIP switches will be added to the 500mW versions in the future.
Note: Assemble the antenna before turning on. Otherwise, the PA chip in the Micro TX module will be permanently damaged.
Note: DO NOT use a 3S or larger battery to power the TX module via the XT30 port. Otherwise, the power chip in the TX module will be permanently damaged.
Note: Do not activate all DIP switches at the same time. You can refer to the table for information on enabling/disabling DIP switches according to different uses.
| 1-2 DIP switches | 3-4 DIP switches | 5-6-7 DIP switches | |
| Update firmware | ON | WORN OUT | WORN OUT |
| Operative mode | WORN OUT | ON | WORN OUT |
| Upgrade backpack | WORN OUT | WORN OUT | ON |
Firmware information
The official ExpressLRS project on Github does NOT support OLED function for now. BETAFPV team will work with ELRS team and make the official repository support OLED and button function as soon as possible.
BETAFPV Micro TX Module ELRS V2.0.0 firmware is released. The firmware does not include the Binding Phrase. So make sure the receiver works with the officially major release V2.0.0 protocol and without Binding Phrase set.
- Support 5D buttons and OLED menu with ELRS 2.0.0 official version.
- The color of the LED changes automatically based on the system status.
- Other new and various features are fully synchronized with the official ELRS 2.0.0.
- When you enter the OLED menu page by long pressing, the connection between the RF TX module and the receiver works normally. Please do not change the Pkt Rate, otherwise you need to turn the receiver back on.
https://github.com/BETAFPV/ExpressLRS
How to Flash Firmware of ELRS RX/TX User Manual.
Now you all may be using ELRS V2.0-RC2 official firmware, but you have lost the function of OLED and Joystick. We will work with the ELRS development team and ensure that the official ELRS firmware supports the full functionality of the Micro TX module. For the milestone, OLED will be officially supported in V2.1.
https://github.com/ExpressLRS/ExpressLRS
How can I set a binding sentence on this Micro TX module when the official mainstream ELRS doesn't support OLED yet?
First , download the source code of the master-betafpv-oled-menu branch locally from Github .
Secondly , open ExpressLRS Configurator and upload the upzip source code from local. Select the target device "BETAFPV 900/2400 TX Micro". You can now set your binding phrase and other options as normal.
Third , build and flash.
Learn more about ExpressLRS
ExpressLRS is an open source RC link for RC applications. Everyone could find this project on Github or join the Facebook Group discussion.
ExpressLRS is based on Semtech Lora Hardware SX127x or SX1280 for RX and TX respectively. aims to achieve the best possible link performance in both speed, latency and range. At 900 MHz a maximum packet rate of 200 Hz is supported. At 2.4 GHz an incredible 500Hz is currently supported with a custom OpenTX build. This makes the ExpressLRS one of the fastest RC links available while still offering long-range performance.
More and more vendors start to support ExpressLRS radio protocol in different parts, such as radio transmitter with ELRS in stock, drone with integrated ELRS receiver, ELRS TX module for JR housing or Nano housing. The BETAFPV team takes part in this project and provides a set of ExpressLRS components.
Backpack function
Some of the ExpressLRS TX modules include an additional ESP8285 chip, which allows us to communicate wirelessly with other ESP8285-enabled devices using a protocol called espnow. We call this chip "Backpack TX". The purpose of the TX-Backpack is to enable wireless communication between the ExpressLRS and other FPV related devices for command and control or querying your configuration.
https://github.com/ExpressLRS/Backpack/wiki
Button and OLED
The ELRS TX module can be configured via the OpenTX LUA script. With OLED and button, radio controller without OpenTX which supports CRSF could use this ELRS Micro module easily. The following remote controls without OpenTX work well with this TX module. Futaba T16IZ, T16SZ and T18SZ (with update to 3.9e), Wsky ET16, Radiolink AT9S Pro.
Note: All 5D button sizes are available on BETAFPV ELRS V2.0.0 firmware. Please update the firmware for new media.
Below is the basic operation of the button and OLED for firmware V1.0.0.
Long press:
On 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 line.
Short press:
On the lock screen page, short press invalid.
On the menu page, short press to move to the next line.
Note: When the RF TX module is entering the menu page, the connection between the RF TX module and the receiver will be lost, the connection will be restored after exiting the menu page automatically; it is necessary to turn the receiver back on if the Pkt Rate has been changed.
Note: When the RF TX module enters the WIFI update state, the button will be invalid. Please turn on the RF TX module again 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 the current settings on the menu page.
Up/Down : Go to the last/next line.
Left/Right : Change the value of this row.
Short press : Enable pairing status or WiFi update status.
Note: You must turn the receiver back on if you have changed the Pkt Rate.
Note: When the RF TX module enters the WIFI update state, the button will be invalid. Please turn on the RF TX module again 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 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 configure it, in the OpenTX system, go to the model settings and, in the "MODEL CONFIGURATION" tab, turn off "Internal RF". Then, enable "External RF" and select "CRSF" as the protocol.
ExpressLRS uses the OpenTX LUA script to control the TX module, such as connecting or setting. With the LUA script, pilots were able to control and set some configurations of the Nano RF TX module. For more details, please check the Support page .
- Save the ELRS.lua/ELRSV2.lua script files on 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 the ELRS/ELRSV2.lua script ready to run just with one click;
- The image below shows the LUA script executed successfully;
ELRS.lua
ELRSV2.lua script
Binding and output power
The Micro RF TX module comes with the officially major release V1.1.0 or V2.0.0 protocol and does not include Binding Phrase. So make sure your receiver works with V1.0.0~V1.1.0 or V2.0.0 officially major release protocol. And no binding phrase set. The Micro RF TX module may enter the link state via the ELRS.lua or ELRSV2.lua script, as described in the "LUA Script" chapter. Also, using the button and OLED, switch 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 pairing state.
ELRS.lua
Note: The LED will NOT flash when entering binding state. The module will exit pairing state 5 seconds later automatically. Press briefly and consecutively 3 times to tie.
ELRSV2.lua script
Note: The LED will NOT flash when entering the binding state. The module will automatically exit the pairing state 5 seconds later.
Note: If you update the RF TX module firmware with your link phrase, make sure your receiver has the same link phrase. The RF TX module and receiver will connect automatically in this situation.
The Micro RF TX module can switch the output power via the ELRS.lua or ELRSV2.lua script, as described in the "LUA Script" chapter. Also, using the button and OLED, switch to the Output position. Change the output power by long pressing the button (ELRS.lua script). Pressing the left or right button (ELRSV2.lua script).
ELRS.lua
Note: The RGB LED will NOT change based on the output power. When the output power is 250mW or above, the fan will rotate automatically. The Micro RF TX module DOES NOT support 1W or 2W output. When you switch to this value, the system will automatically switch to 500 mW.
ELRSV2.lua script
Note: The RGB LED will NOT change based on the output power. When the output power is the threshold value (default 250mW) or above, the fan will rotate automatically.
FAQ
Download the BETAFPV ELRS Micro TX module user manual.
Package Included
- 1 * BETAFPV ELRS Micro TX Module
- 1 * BETAFPV Moxon Antenna
- 1 * Micro TX Module User Manual
- 1 * Replacement USB Data Cable (Type A to Type C)
The antenna in the box is not the same as the one shown below for the 915 MHz and 868 MHz versions.
The USB port housing is 6.2*11mm and may not fit your USB cables. So a spare USB data cable (Type A to Type C) is included in the package for all orders from November 18, 2021.
Plus, with an upgraded USB port housing up to 6.5*13.5mm, the new module case is compatible with most USB Type-C cables, including yours. Click here to buy! At the same time, the ELRS Micro TX module comes with an updated case for orders starting now.
For the previous order, if you don't have a suitable USB cable for this Micro module, please contact us. Email to support@betafpv.com.
SHIPPING
Italy
• Express Shipping (1-4 working days)
• Free for orders over €150.00
• €9.99 for orders under €150.00
Europe (European Union)
• International Express Shipping (2-6 business days)
• €29.99 for all orders
PAYMENT METHODS
On Drone24hours.com you can use the following payment methods:
- Paypal
- Visa
- Visa Electron
- CartaSi
- Postepay
- MasterCard
- American Express
- Paypal prepaid cards linked to the Visa or Mastercard circuit
- Cash on delivery
Return Policy
You can return products that you are not satisfied with within 14 days of receiving your order. To be eligible for a return, the product must be in the same condition in which you received it, unworn or unused, with tags and in the original packaging. You must also have your receipt or proof of purchase.
Damaged or incorrect goods
In case you receive wrong or damaged goods, please contact us immediately within 14 days of receiving your order. Please send an email with photos and videos of the product, a detailed description of the problem and what you have done to solve it. You may be asked to return the item. For confirmed defective goods, we will send a replacement free of charge.
Exceptions / Non-returnable items
Some items cannot be returned, such as perishable goods (food, flowers, plants), personalized or made-to-order products, and personal care products (cosmetics). We do not accept returns on hazardous materials, flammable liquids, or gases. We do not accept returns on sale items or gift cards.
Exchanges
If you wish to exchange an item, the fastest way is to return it and place a new order for the new item.
Under the 24-month Legal Guarantee, Drone24Hours is responsible to the consumer for any defects in conformity that cannot be detected at the time of purchase.
The lack of conformity exists when the product is not suitable for the use for which it is normally intended, does not conform to the description or does not possess the qualities promised by the seller, does not offer the qualities and performances usual for a good of the same type, is not suitable for the particular use desired by the consumer if brought to the attention of the seller at the time of purchase and accepted by the seller (art. 129 of the Consumer Code).
Any lack of conformity which becomes apparent within 24 months of the date of purchase of the goods must be reported within 2 months of the date of discovery of the defect.
Unless proven otherwise, it is presumed that any lack of conformity that becomes apparent within 6 months of delivery of the goods already existed on that date. In the event of a lack of conformity, the consumer has the right to have the conformity of the goods restored, free of charge, by repair or replacement (art. 130 of the Consumer Code).
The consumer may ask, at his choice, the seller to repair the goods or replace them, free of charge in both cases, unless the requested remedy is objectively impossible or excessively expensive compared to the other. Repairs or replacements must be carried out within a reasonable time from the request of the Consumer; the average time for returning the product to the Consumer is 20 days.
If Drone24hours is unable to return the repaired product within the maximum period of 60 days, the consumer may request one of the alternative remedies (replacement, termination of the contract, price reduction).
Drone24Hours will send the product for any repairs to the Technical Assistance Center authorized by the Manufacturer.
What happens if the Service Center does not find the lack of conformity?
If the lack of conformity is not found, Drone24Hours will communicate the estimate to the Customer, who can decide whether or not to carry out the repair at his own expense. In this case, any transport costs and diagnosis of the defect requested by the Assistance Center will be borne by the Customer.
| Output power |
500mw, 1W |
|---|---|
| Frequency |
ELRS 2.4Ghz, ELRS 868hz |
